Considering a SEPLOS Battery or BMS? Here is my experience so far... 

Great critical review Andy. Not only is it valuable to Seplos, but also to other manufacturers. They get to see what the competition have, and they get to see the good and bad. The things you have mentioned are generally universal amongst other customers. In an age of too many "reviews" being sponsored and censored before release, it's great to see genuine stuff coming out.

Effectivement ton constat est honnête et mérite que SEPLOS ce penche sur ces améliorations techniques ... toutefois je reste convaincu par la qualité de ton choix sur ce KIT SEPLOS et je le trouve superbe pour construire soit même sa batterie, surtout pour tout ceux qui aime ta chaîne RU-vid et qui aime l'aventure technique. Merci encore pour toutes ces remarques et bonne continuation.

I first came across you with your Outlander vids which gave me good insights... Glad to have come across you again 👍🏾

Really looking forward building my 280AH Kit after testing the last 3 Cells. Have some concers about the communication to the SMA Sunny Island Charger but lets see how it will work. Thank you for your quality content 👍

best video ever thank you for let them know the shipping cost and other negatives of the box all true is a grate box but need some modifications y will get them wean they fix some of the problems.. you the man Andy keep it up

I have 3 Selpos Mason 206Ah 10.5kWh battery packs, which uses the 3.2v 206Ah Prismatic Battery Cell modules, and just like yours the the battery packs came disassembled, so the BMS setup procedure is necessary because you are acting as the assembly line in a factory. These packs are design for this in mind. In fact the Mason Battery Pack I have, which has those click on/off connectors you pointed out are design for vehicles, not home storage hence the lack of a cut off switch. I am now about to order their Pusung 135Ah 7kWh 51.2v Battery Pack which is designed for home storage and comes with a cut off switch. Your review is very honest and I can agree with most all of the findings you've made. To answer your question on joining to packs together and the master BMS having autonomy over the 2 packs is correct. The lowest cell module will determine the cut off procedure for the entire bank.

I think the review is very good . You seemed to calm down a bit from the previous Seplos problems . And you did the scientific review as you do normally. So good job there. Greetings from a small town close to Prague. And today my adventure with cells starts. I just received EBD-A-20H. 1-30V,0-20A.200w load. Good price too. Maybe somebody could modd it to 40A. I'm pretty sure the limit 20A is software... With 1 cell.

I am truly considering buying two of the big cases, but the shipping cost needs to go down! And I really like your videos! You have both knowledge, charisma and you have a really cool accent 👍🏻😁 Greetings from Norway 🇳🇴

Excellent review Andy, I think you smashed it out of the park. I have 3 x Seplos “Suntorque” 100A? 5kw batteries, 2 of which I got around 3/3/2022 a 2nd battery 2weeks later & the third was not delivered till May for some reason, anyhow I still have not been able to communicate with the batteries as yet as the serial cable I ordered doesn’t seem to work. The 1st 2 batteries were connected to an all-in-one system (PowerMr 5kw) charging from 8am-4pm and then running a few appliances through the night as I have 10kw of PV on roof I just slow charge the 2 batteries (20-30A) by day from GPO inside house (temporary trolley mounted setup for testing purposes at this stage). These first 2 batteries continued to lose capacity from the 1st few charges and over 2 months had come down to 54% & 64% SOC respectively. I contacted the supplier several times but did not get much of an answer except that I needed to get communication happening with the BMS, well it is, was, has all been toooo much with computer issues & cable issues & downloads & everything, F**K ME! Anyhow, thanks to you Andy and your recent Seplos series, I have learnt & figured out some of the issues (still ongoing) & are slowly moving forward, but it is all very frustrating. Anyhow, the 3rd battery arrived and I was hesitant to hook it into my system because of the issues I was having, but I did anyhow and have found that last battery has been able to mostly fully charge each day still while the other two did not, so this could be a reason to want to individually set BMS parameters of newly added batteries to a system and NOT have a primary battery set all packs parameters to one set of settings. I have discharged all 3 batteries individually & then recharged as far as possible to get the first 2 batteries to come up to 88%-94% again thanks to you & your great video’s. Some Comments/Suggestions to/for SEPLOS:- 1. Listen to ANDY. 2. Active Balancing, 2A minimum, built into Bluetooth App for IOS & Android a must, this could have simple and advanced modes for configurations so more people can understand and use at least basic parameters via mobile Bluetooth App and for long distance communications as I have a bus up north I am not often at, so being able to get warnings and change parameters from afar without complicated computer setups would be very beneficial for these situations, boats, vans, etc. maybe consider a proprietary Dolly, or a strategically placed set of wheels/casters and a pop up handle for manoeuvring these monolithic batteries (Im getting too old to be humping these weights). I see you do have a castor base set already, that’s probably a plus! Terminals: just do something better and more user/DIY friendly for the love of God, & I am atheist. Isolator Switch; is probably a must & a nice convenience at least on these batterie’s. These cases and engineering seem very nice indeed & Im sure it would take little to upgrade the earthing system throughout & get another FROG from Andy, & ME! I really want at least one of your beautiful cases full of batteries to grace & compliment my setup soonish, but I am very hesitant at this stage because it means a fair bit of modifying I would have to do to meet some of these requirements I feel should already be in these pack units and would also add a lot more cost to do the install of such modifications, but then they would truly be great. COST; of shipping does seem rather excessive, cant you do something A LOT BETTER than that, us Aussies do enjoy paying far tooo much for most things on a Global scale, EVERYONE knows that, but this shipping cost is a bit much for many. I love Andy’s, honest, analytical, logical, funny & fair take on things, he works really hard to do all he does, and generally tries to make everything great (Again!), and he also calls a spade a spade, as he sees it through extensive testing, which is fair and scientific, SEPLOS, you are lucky to have Andy on your side because I know he just wants to make you GREAT AGAIN, and I would soon like one of your improved kits. Ill rap it up, your packaging is atrocious to say the least, get your act together, this is delicate, sensitive, supposedly precise electronic equipment, (temp sensors are suspect if not damaged in transit from shit flying everywhere),,,, did I mention expensive equipment? That should arrive in a professional package (How much are your packing & shipping costs again?) in a 1st class state! Because this is a real F**K YOU to Australian customers from SEPLOS, (thankyou for that, us Aussies dont get reemed properly every day!). One last thing: maybe get ur programmers and an ENGLISH teacher together so your programming software is a bit more comprehensible, there are some very odd terminology used throughout your system, maybe we need an Australian version, LOL. Anyhow, after such a lengthy caning ( and I dont like being a Troll or an asshole generally), please do take my criticisms (and everyone else’s) constructively, and implement some (at least) changes here as I do believe this mostly good, but could be a really great product with a few modifications. Thanks for listening

Good day to you dear Andy, The need for balancing could be determined by expressing that when one cell is “behind” this will be the “king” of the total pack (battery). When all cells are within specs, it is most important to top-balance the pack. Otherwise the one cell is demanding his/her SOC to the whole package. Although this has being covered by you very well, some of us are does not being aware of the importance to first top-balance the pack in order to reach the top SOC of the whole pack. I am still learning and I greet you with most friendly regards. Please keep your channel alive….. Beste groet, Peter

I've been watching these for a while now and they looked pretty good overall, and your review gives a better insight. I would like to see how the 200A version goes in real life to compare against the trusty 200A JK.

Love this video! After watching this video I would buy them. To me the pros outweigh the cons. The case would be the reason I would buy. I would consider the BMS a free gift. I don't care if you can connect to an inverter or charge controller. I actually don't like anything connecting to anything in my solar system wirelessly. If anything connects, do it with wires.

It’s always a GOOD day when there’s another video to watch from Andy! As always…… Thanks Andy 👍, love your work, (and always love your sense of humour too!) Great summary - I totally concur with your summation. There is much to like about the Seplos, BUT I do think the Seplos BMS is a fail though, simply because of ultra low balance current, and lack of BT access. They desperately need to improve that. I also agree- a cooling fan for the battery box would definitely be desirable for warm climates. Personally: I’d buy the box, but not the electronic components that come with it.

Here in USA 🇺🇸 EG4 battery 🔋 is a much cheaper and better salutation for me at $ 1,400 bucks. There well made and work really nice when paired with EG4 6,500 watt converter at $1,200. But I really enjoyed watching your videos and that was a great honest review of this battery system thanks.

Good overview of the pros/cons. I think it has potential but just isn't ready for mass consumption in the state you got it.

Definitely the communication has to be improved right now! Actually I like the Mason like you, it is very solid, it is well designed and if the bms is not doing what I want, I kick it out and use an jk or a daly or another one 😉 but the case is top of the pop! That's the reason why I bought a second one. Best regards from sunny hot Germany 🤣👍🤘. Danke Andy.....Marko

Hi Andy, thank your for your well made review! I enjoyed it very much, especially your demonstration on top of the box "...I will show you something...hops, hops hops..." 😂 At video position 22:50 you said, you've paid only 600 bucks vor 16 battery cells... That can't be true?! If I'm wrong, please provide the sellers store 😉

Very informative. I figured out that a 52 V 280 Ah pack would be way too heavy. So I was considering making two 26 V packs and put the in series. According Seplos that is not possible. It would be a bit more expensive, but I was willing to pay for that to be flexible.

I have 4 of the 6.9KW Mason kits, and 3 of the 280AH kits. I also purchased JASSN busbar to connect them in parallel. I plan on keeping each battery isolated from a comms perspective, so no worries there. I LOVE their cases, and the BMS on battery status screen. All they need to do is add access to all functions via the screen, and the PC issue goes away.

The seplos doesn't stop at 95%. It keeps charging until pack voltage is above the set limit. But it does request the charger to lower the charge current (if possible, charger does not need to answer to it) at around that point. First it steps down to max 10A and further on it request only 2A. This allows a slow steep to the max voltage. As you know, a higher current results in a higher overal voltage so high current can easily cause one cell to go overvoltage. This is the MAIN reason why you need communcation to the charger. Even a high current balancer couldn't keep this up. And yes, 2A is still too much for the 150mA passive balancer but my experience is that the BMS keeps the cells perfectly in balance. And what is your problem with connecting the two BMS-es? They should just work togegher. And no, if one BMS shuts down his pack (for any reason) it will not cause the other BMS to shut down. This is not true.

Hello Andy I agree about Seplos having a robust strong structure but no way to turn off the battery pack in case of emergency or for service or other that is what made me design my own battery pack based on the seplos and adding the breaker to make it suitable

Hello Andy, thanks for this info, is a good video. Seplos now make up the cost, for the 135Ah with battery (Allibaba 1.450usd) now 2.160,-usd and plus shipping cost of 450,-usd. Jehh is nice.

Thanks to you, I have 14x 280 DIY boxes on route 😁. By the time the slow boat from China arrives, I hope the firmware has improved.

Being an attractive package, I can see why looks and some upfront simplicity would be the clincher to buy these. At the end of the day, you pretty much indicated that you will be doing some significant mods to the workings. Too many for me to say yes at this point. Convinces me even more to up my own game for a better looking finish though.

Not raining down here. Sun hot Victoria lol. What a upside down downunder world, Andy.

I Was Thinking About Buying The 24 Volt Version!!! All The Problems You Are Having!!! HUMMMMMMMMMM!!!!! I Will Wait for All The BUGS To Be Ironed Out Thanks for All The Info. You Are Saying About These Batteries!!! GREAT CHANNEL MT FRIEND!!!

Hello from Germany. (Heute mal auf Englisch) I'm now starting to build my seplos battery! But without this case, only the eve lf280k cells and the seplos 16s 150 amp bms! My thought was, to save the money for the case and built an own one. I've loaded my cells all to 3,65V separately and put them in parallel together for passive balancing. In a view days I might be able to report how the system works! But, after viewing this video, I think I need an active balancer for top balancing! 😅🙈 I will report!! Greetings from Germany Grüße aus Deutschland! 🤙😎

Good review, and pros/cons for my decision. Personally I see the availability of a PC interface as a pro - as I hate to walk always with my mobile to the battery room, or drive to the beehouse to get access to the JK's. Ok I placed now a old mobile there to do a remote access. Best would be to do a mobile app for the mobile junkee's which live in the battery room *smile*. I totally agree with the shipping cost, I think their Idee is to have local dealer, which would solve this. Thank you for the work, and constructive feedback. Hmm what will I now do with all my 310AH cells ...

I ordered 2 of the Mason 280 DIY Units around 08 August, price was aprox. 1250 USD icl. Shipping & DDP to Austria, shipping by train (!) to Poland, then via UPS to Austria. It should arrive around 20 September. Comunication via Alibaba with Semplos is quite good and quite fast.

So Andy, get busy building my 2.0 kit! Just keep shipping down!

Rain? What's rain? Here in Northern Germany we've haven't had proper Rain for months. A few drizzles one or two weeks ago and lately the wind's been picking up but overall it's extremely dry :D I don't have one (yet*) but I reccomended them to my boss and he got two 280ah cases which I will install for him. So we'll see how it works out, worst case I'll throw a JK in there and call it a day :) *I've got a DIY case for my LF280Ks with a JK 200A

Thanks Andy

I think the plastic film is not for damage from the outside; but more to protect as much as possible metal; to avoid shorting when removing or adding the lid.

I'm about to sell my suburban home and plan on taking what I get from it to reinvest in an off-grid property I'm slowly working on. Besides earthworks, one of the first major investments I'm planning on is building out a total solar-based power system, and placing it in a well-insulated, enclosed trailer, so that I can move it wherever I need on the 6.5 acre property as it is developed, and/or even take it to my parent's house in an emergency, or even move it completely with me should I decide to move to one of the farms we own and lease out, going from a 6.5-acre off-grid homestead to 140ish acres. Thus mobility is key. That being said, I want this system to be able to power a full homestead cabin, complete with a mini-split heat/air system, ham radio, etc, as well as a nicely appointed shop, complete with air compressor, welders etc. So It's going to be rather large. I'm planning on full Victron other than the batteries. For those, part of me who wants to DIY, I've built a couple of small batteries, but nothing this large. Since however, I want at least a good portion of the system to be pretty much foolproof (me being the fool), and dead reliable, with excellent, quick support should there be a problem, I'll likely go SOK, EG4 or the like, with the option of adding DIY capacity in the future. So for me, given the options and this criterion, the Seplos's would be out of the running. * Non-standard terminals * Bad packaging, which I could see leading to a support call should something become damaged in shipment * Questionable offshore support (especially as tensions seem to be rising between the U.S. and China) * BMS Communication problems Yeah, for something that's not a hobby, but I would be completely relying on.. it's a pass for me.

Hi Andy, the communication is absolutely essential for some hybrid inverter. My brother has a Solis Hybrid inverter and it require canbus communication for any lithium battery to get the battery setting, you cannot set any parameter at all beside basic setting for lead-acid battery like voltage, charge/discharge current and capacity, on top of that can only charge current up to 0.2c of the capacity setting. It doesn't really work with his inverter at all I mean high voltage alarm daily, as soon as that happend he has to restart the inverter to clear it. as far as I can find only Seplos BMS can properly communicate with his inverter via canbus. We verified this with Seplos before making the purchase. my brother doesn't have computer at home, so I program bms for him once and done. Bluetooth option is convention but not necessary. About the 95% SOC BMS turn off charging be default, it is not true in my case it only limit charge via resistance. And your comment about this kind of contradict yourself in this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OsvPYw6hoHc.html in a way. limited charging above 95% soc is just another way to manage your battery cycle life and you can always turn it off if you wanted to, it is not like they take that option away from you like some company does.

Very Good Comments

As I own 2 of the 135's I think your spot on on both the positives and negatives. I have not experienced the shutdowns as you stated. But I run both as dumb not using the CAN connection. The BMS does need work and does need a better balancer. I do need to buy a few of the 280 boxes and DIY them myself. But this also makes me wonder if I really even want to use their BMS. Just connect the NEEEEEY and an active balancer and I have the perfect box. Then again A few Custom PCB's to allow the connection of an active balancer would be sweet indeed. Again the batteries have performed flawlessly. So A bit of heartburn over balance at 95% is not a big thing. But how far down the rabbit hole can we go to make a perfect functional battery? I think very far. New terminals, New PCB's, New BMS's, New active balancers, the list can go on for awhile. Oh Oh the cable that runs to the BMS can we get a Y there and connect the Active balancer? Either at the cable or at the connector itself. I really like the boxes, I have had NO issues, and I would like more. I have not purchased the 280 boxes myself as The total cost is still a bit to high. Great Videos and thanks for your time.

Andy, I've heard your gripe a few times about canbus and your perception of a waste that it is. Here are a couple things my system can do with canbus it couldn't otherwise. First is charge rate control when the pack is stressed. Too hot, too cold, cell peaking, etc. Canbus can gracefully command the inverter/mppts to slow down or stop. Your 150ma of balancing can actually be plenty in a system where charge rate can be reduced to a trickle. You can do 3.6ah on 24hrs, surely your cells aren't so awful they are that far off? Though you tend to go weeks between full charges so it likely is more pronounced. I'm grid backed but do not feed in. I can top up each weekend on low tariffs. The other feature that is of great use with canbus is to have significantly out of proportion charging capability to battery bank size. To run Aircon from solar I have an array that is significantly too big for the battery bank. Canbus allows the mppts, inverter and battery to have a combined understanding of where the power is. I can set a charge rate of say, 50 amps to the battery, and have 220 amps incoming from the mppts when the inverter is consuming the other 170 amps. If the inverter load drops, rather than the bms going into protect, it keeps the canbus informed of its ingested amps and the mppts ramp down their charging current. I can also commission completely out of whack banks and canbus keeps the charge rate under control automatically. It turns a binary on and off into a ramped charging profile that passive balancing is capable of resolving. Someone else mentiomed this, but huge systems often need all the battery banks operating as one. My two 15kva inverters can operate 500amps continuous draw and peak 800amps. That would blow the guts right out of a lone mosfet bms if the rest are shutdown on low cell. Canbus can also provide a discharge ramp, it can tell the inverters that the batteries can no longer operate in their state and the inverter can stop even before a true low voltage disconnect occurs. Canbus really shines though in a hybrid offgrid/grid backed setup where the goal is to self consume as much as possible. You can achieve some of this with the victron shunt, but I don't use one in my home build, I use the bms shunt and canbus. My bms happily controls the charging. It holds absorption at a slow trickle until its done its configured share of passive balancing and then tells the chargers to all shutdown. I don't have to rely on an overall pack voltage to be right for the final phase of charging, the bms can regulate it dynamically. Anywho, just wanted to share! Have a great day!

loving the videos and content ....quick question from a beginner ....how about having a seplos system and adding a extra jk bms in paralel with the current seplos one ? ( it would help with holding up at the top balance)

hi andy it actually makes sense that this different Battery packs talk to each other or to the inverter/charge controller. imagine you have a really big PV - so big that in full sunshine you have all the parallel batteries on max charge current. so when you than have a problem/fault with one BMS and it disconnects ->all the other Packs will also disconnect because of OverChargeCurrent. than it would be nice if your inverter/mpptcharger lowers the charge current so the rest of the packs can still continue to charge on their individual max charge current. otherwise you have all the batteries disconnected because of a single fault in a single Pack and a lot of Energy that could charge your batteries is lost until you manually clear the issue. Best regards form Upper Austria

Tangential: It seems that there is a specification of Seplos RS485 protocol available on the internet. If it is accurate, it means that a custom monitoring and management software for such a BMS could be built fairly quickly. It might be running on a small computer like a Raspberry Pi which could then have a web interface. It could effectively serve as an alternative to native mobile application connected over Bluetooth. And it should be simpler to integrate into home automation systems like Home Assistant.

Hi Andy I have 2 seplos BMS’s connected and communicating to my PC. The main benefit for me is they display both pack information on the seplos Home Screen, cycling automatically between packs on a loop. To answer another question from your vid tonight. (Excellent as always). Changing one perimeter does not change both bms’s only the one your working on. Why connect to your inverter? Well for me I’m connected to a so far inverter (pylon protocol). And the seplos communicates correct soc to the inverter, this inverter communicates this info to the cloud (then to my phone). As you rightly say seplos has no Bluetooth or Wi-Fi connection, this way for me is an easy solution for my present inverter (I know I have to upgrade the inverter. Hope this helps Tony

Hi Andy. Re. Seplos shutdown/standby Toggle switches stop the shutdown. Go to ‘Upload parameter’ Left hand window ‘fiction switch’ Scroll down to the bottom of the list ‘Switch off function’ And Standby function Toggle switches as needed 👍

Is a good system for beginners and for the ones to start to dive into potential full DYI. Prefer these one's to all the others that include 3D printed parts and other stuff. The connectors terminals on the big one should be using the standard most common out there at least... ...

I've been wondering... in the event that one or more cells vent, what will happen? That case looks relatively air tight. How much volume of gas would there be and how quickly does it happen? Obviously not something you can test but has been on my mind. If I were to install this in my house it'd be nice if there was a vent connection to hook it up to a dryer vent-style outlet to direct the gasses safely out of the home.

Heya, I like the case a lot nice and sturdy. the long pcb for the balance leads is almost a must for the eye. but the bms has issues and for 200 dollars it shut be a active smar balance whit minimum of 1A balancing that most be possible. and comminucation in this time and age shut be plug and play and with a app on your foon

Thanks for the detailed comment, I would like to bring my experience with Seplos, I ordered 2 Mason boxes for the 280 amp kit on 12 August, punctually paid after the adjustments to the order on 18 August 1455 Euros of which 330 of guaranteed punctual shipping , and up to that day contacts have been courteous and quick. After the 8 days of the Alibaba terms for timely shipping I contacted Blake Xu of Seplos, who informed me that the shipment will take place in the first days of September for various reasons holidays and bad weather ... ok, I wait for September and after another contact I come informed that my item is in high demand and shipping will take place later ... today is September 10th and there is no shipping track, I have been under a lot of pressure to make the payment quickly, but the same cannot say about the shipping and the answers that seem to me to take time by making imaginative excuses each time different. I am very disappointed I just hope that the dialectic gives way to facts. A cordial greeting and thanks again for your time.

🤣🤣 the weight…..Andy I burst out laughing ..thanks👍👍

Re the shipping cost - I think weight is not the issue - it’s volumetric size. Shipping they will take up about 2/3 the volume of batteries with padding. Can they do better on cost - it probably depends on how many they sell and how fast you want the case. As others have pointed out communicating correct SOC to the inverter is critical if you’re running cloud based software that supplies loads based on how much energy is left in the battery, or controls charging based on solar output. Plus I think it’s mandatory if you want to add a battery to a grid connected inverter.

Excellent

Andy, the batteries should be used in conjunction with the Seplos JASSN busbars, which has breakers for each attached battery.

It looks like there is room on the front panel to add a breaker or disconnect switch. Also a small fan ( it might not do any good). Good video.

For me, the primary benefit of battery to inverter/charger communication is backing down charge current when one cell approaches overvoltage shutdown to give more leverage for BMS balancing current to fix the situation without a BMS shutdown. Seplos terminating charge when a cell just approaches overvoltage cutout, leaving cell balancing incomplete, is not a good option as highest cell will quickly drop below 3.4v stopping its bleed balancing prematurely. You lose the charge current overpotential terminal voltage rise when you stop charge current which is the best cell comparison indicator of cell SOC balance. Guess they feel having battery shutdown is worse than having imbalanced cells. That logic will just create a continuing downward spiral of degrading SOC balance of cells. From their perspective, they may turn charging back on after highest cell drops, so the balancing will eventually be done. However, many chargers will interpret the drop off in charge current as absorb complete and go to float voltage therefore preventing further balancing of cells by BMS. I do believe in having 1% to 2% of cell capacity rating in balancing current capability, particularly when you do not bring battery to full state of charge often, limiting balancing time opportunity. Only having 150 mA balancing on 280 AH cell requires a lot of time holding cells at higher absorb voltage to achieve balancing which is not great treatment of battery. The more time spent balancing above 3.4v, the more cell electrolyte damage is done.

I must have missed it. Last time you were unable to get the computer to talk to the 280Ah battery pack. But now you can?

Another consideration, for the big seplos is that the shipping can be divided by 2.8 to 3 because just 1 of those is equal to 3 of the 100ah server rack batteries.

Oh and yes the comms need to interface to our mppt chargers and maybe home automation via mqtt or Or something. The only thing about going to the inverter is say the frequency shifting option so that ac coupled charging could be controlled via soc.

Andy, I'm using 3 bms from Seplos and when 1 pack is fully charged, the other is still charging. Same thing with discharge process, if there is 1 pack discharged the other is keep discharging until low voltage disconnect occurred.

Definitely they need to have/keep the big general screw terminals on the front...

It would be nice to get the Seplos DIY boxes, but allowing for your own BMS.

Andy I like your battery 2.0 better, I have built something similar (just a lot smaller) and have now gone the homeassistant route towards optimising and using the sun's energy to supply 95-100% of my needs. Communication is a big thing when it comes to evaluating data and making sensible choices. Manually turning on the pool pump when there is excess sun feels like you are babysitting your power usage

One thing I forgot about was if your whole system is communicating and you put in the wrong parameters that are system wide and they fail, they are going to fail when you have the least ability to repair it. Or worse yet doesn't shut down the the system but damages the battery thru fat fingering 3.95 instead of 3.65. I like setting each part independently.

There’s a port on the bms that you can connect to a switch. You’ll find its description in the manual, chapter 8: connections. They call it inner switch.

After years of building serves you learn very quickly remove the HDDs before moving , and replace when racked .. The same principle applies here build in situ .

58VDC should come under extra low voltage directive and is classed as safe to touch?

Can you put the box vertically on its longer side? I want to install the 280Ah Mason DIY Kit in my campervan.

Good on you for acknowledging us Linux users!

Not related to this video but wasn’t getting a response on the older videos. Are you having to retighten your busbars on your eve cells due to normal swelling movement? Are you concerned about any stress on the terminals of each cell due to swelling because your not using flexible busbars? It’s my understanding that some swelling happens if there isn’t compression.

Dont forget the pre-aged batteries it came with, and don't expect a firmware upgrade to correct hardware deficiencies of an inactive BMS. Also the better BMS like the JK only prevents over charging of a battery with a high cell, the battery is still able to provide power output.

Can someone give me an answer please, I have a Seplos BMS E10 , i.e. the new version and it says at point 18 Harging overvoltage protection and is set to 63 Volt and point 19 is charging overvoltage recovery set to 61 Volt, but the max in my system is 58 Volt shut down at 3,625 V/Cell. Changing is not posible, what did your Software say? Thanks to anybody

I'm looking for the power overtemperature ntc: it is faulty and i would like to replace it.

Hi! I'm considering changing my battery. Now I have 4 WV NMC 12S modules, they are 48v and a total of 27kwh. The problem is that the battery low-top range is 40-49v but in fact the deye cuts discharge arrond 43/44v. I think the 40-58v voltage range of a lifepo4 would be much better, even knowing that the seplos mason has around 14kwh. Does make sense the idea of changing it? Thanks!

hi andy, merry christmas, i have a question, two 300 amp battery banks, with two seplos and communication with inverter/charger, maximum charge per bank 0.5c (150 amp), 190 amp battery charger and total solar panels 11 Kwatts, . What would happen if one battery is fully charged and the other is not and the charger/inverter is at 190 amps? Would the communication of seplos with inverter correct the amount of load to 150 Amps or less? Thanks a lot.

So, is it possible to connect a NEEY active balancer to the Seplos V3 BMS so that the BMS can activate the balancer if and when it needs to automatically. As there is a set of pads to activate the Balancer it should be possible if the Seplos has an active balance output. Ideas?

Andy, I have a near identical setup to your v1 battery in a tub, allbeit with CALB180 cells. Would it possible to purchase the SEPLOS DIY kit but still retain my JKBMS, or will the wiring loom prevent this?

Hi Andy. Have tried to use active balancer? Neey or similar with Seplos Mason?

Maybe has come the time to check on batrium BMS and k9! An in deep review could be awesome! Cheers

Did you ever get the big battery to communicate with your computer?

I have 6 of the 200a versions No disconnect if one reports an error . Just that bms blocks charge/discharge Negative . The frigging weight.. 2x3 stacked up

I have a 2p8s battery pack 24v 620ah contacted Seplos for the diagram of how to connect the pcb bars to this configuration since they said their bms is 8s to 16s 200ah and the 48v 16s 280ah box would work but they don't seem to understand what 2p8s means their documentation is also deficient for different configurations

Hello Andy, I also bought such a bms 150a without a box. This should work together with my Sma System Sunny Island 8.0h 13. This also worked. What bothers me is that the seplos BMS continues to allow a charging capacity of 6kw just before 100% and then suddenly shuts it off. This throws my system completely off track and produces battery errors via can. This should be improved so that from 95% it can only be loaded slowly, e.g. with the Pylontech bms. Of these I also have 5x us3000b. This works wonderfully.

Crap. 5 seconds in and I gotta pee. BRB. *back. Good video! thanks for the review!

Hi Andy, If running battery packs in parallel did you confirm if all BMS's switch off in the event of a cell fault? And if not what would be the result if one pack disconnecting due to an over voltage cell and then reconnected at a point when the rest of the packs were near flat. Not a good result one would think!!!

i have a question for ya.. how do you go about figure out a .7c charge rate?

Any chance of a review of the cerbo gx and LTE dongle for connection? Or remote Wi-Fi dongle?

Thanks for grat review! Did SEPLOS BMS supports only Lefepo4 jr regular li-ion(2,7v - 4,2v) elements? thanks

As I said in your other video, I ordered 8 of the DIY 280Ah/200A BMS kits and all kits came packaged VERY well - no damage or issues. As for grounding, if you buy ready-made batteries (e.g. Battle Born) they do not need grounding and these cases are powder coated. I think your negatives are very opinionated. The terminals could be a positive from a beginner aspect. As for the BMS parameter settings/BT access, I think you are not considering these BMS' are meant to be enterprise grade. You would not find BT access to anything within a data center. That would be a HUGE security hole - "What do you do if you don't have a computer at home?" This comment baffles me. How did you order the dang things in the first place??? Sure I understand the Mac scenario. I use 99% Linux at my house, but the market share for home computers is still majority Windows. I'm working on an open source app to communicate with these BMS'. Hopefully I can bridge the non-Windows gap for others and I'm hoping to setup a Raspberry Pi image to monitor these. As well though, you should only need to change parameters when you first set them up. These batteries should be "set and forget" appliances. For balancing, you should only have to top balance them when you put them into production (as long as you new Grade A cells,) and again - "set it and forget it!" You SHOULD only be charging to 90% and discharging to 10% in order to preserve your cell investment. I look at it as a feature that I don't have to worry about doing any calculations to setup the 90/10 rules. If you have to balance your cells often, then I think you have other issues. I can also say that they DO NOT shut off other batteries if one is turned off. They do however, all turn on when the master (#1) is turned on and they are all connected to RS485 and addressing is set. I agree there is room for improvement. Though in my opinion, every battery has room for improvement. I'll be putting out my video on these soon. For those who have Schneider equipment, I also have a python app that I wrote to query the Schneider equipment using the Conext Gateway. I also have a Home Assistant add-on for it as well along with the instructions for creating a Docker image on my Github page. github.com/shorawitz/conext-api

I would like to see you try the batrium bms

Maybe shipping costs is how they make up for a reasonable price? Does shipping costs become a profit center? I have seen a wide variety of shipping costs for similar items.

Thank u Andy Yes the prize for shipping over the top $478 AUD and if your going to have a rack system Times that By 4 kits That close to $2000 AUD That stopping me. But i do like the kits there up gradable for the future So yes if they lower there shipping cost i look into it then But i not going to pay $478 AUD Just for shipping #SEPLOS Take care Andy and Miss Andy see u Next Video Mate

Those leads you can get from power plus hearing melboure because they use them for their batteries to make sure of ip rating

Hallo Andy! Ich hatte auch das Problem dass er das laden verhindert wenn SOC hoch ist, aber diese Funktion kann man abschalten. In der Software ist das der Punkt: "Intermittent power supply function". Wenn diese Funktion deaktiviert ist, dann kann man auch bei SOC 100% weiter laden. Ich finde das BMS nicht schlecht, man kann viel einstellen, fast zu viel ^^ Kommunikation mit Victron über CAN war auch kein Problem, Victron Kabel Typ 1 und es läuft. Grüße

Please sir I want to know more on battery Watts , solar panels Watts mppt also and invaters there voltage and Watts there connection and more, thank you sir.

Andy, As always, great humor:-)) One question, maybe irrelevant? I thought all bms wires should have equal lenght. The cell at the end of the pcb should then have a larger resistance. So, do you think Seplos uses some resistors orsoftware to overcome that issue?

Andy! I need an extra PCB for my large 280 seplos box, I'll buy one off of ya! I shorted a lead and the connection on the PCB is gone...

If the total cost plus shipping is less than a ready made, then yes, I'd get it, but with a $400 shipping or whatever, plus having to buy the batteries and ship those, the overall cost might just be cheaper to buy the fully ready made one. It's just a matter of doing the numbers and if you want to consider your hourly wage in there. As for the CANbus cable, you can keep them disconnected during operation, and have them almost plugged in so you can quickly plug them in for any modifications. seems to be a ok compromise.

Have you the alliababa link the DIY battery box?

I get no responses back, you are a special client

Are you allowed to put them vertically, making the cells layong on their side and on top of each other with their weight? Or is this a bad idea in general for prismatic cells?

I have a deligreen/daly smart bms and yes I can upgrade the firmware with PCmaster. Andy get yourself a hydraulic scissors lift trolley cost about $500 but can lift 250kg to bench height from 120mm best thing I ever got.

Did you get the BMS up and running on the DIY 280AH kit?