Testing the new EEL V4 48V DIY Box with JK Inverter BMS. Are we there yet???🫏 

Thanks for your sharing, Andy!👍 Please allow me to explain:1.Our battery engineers said that only high-voltage batteries(above 110V) need grounding protection,2. We will offer 2 black screen brackets, the one shown on the video is just a test version. Anyway, we still get a lot of inspiration from your video, and we believe that there will be a better EEL 48V DIY box in a short time!🥰

The breaking capacity of the B250 Circuit Breaker is 10000A. It's the number on the front of it in the rectangle. The reduced diameter of the busbars connected to the breaker isn't an issue. Yes, they could become a little bit warmer with high currents, but it's only on a short path and there's enough metal around to dissipate the heat. Viele Grüße aus der Nähe von Berlin.

Thanks for the Video :) I have two V4 battery boxes mounted on a wheeled cart, specifically the ones without displays. The BMS is attached to the front panel, and the compression plate fits perfectly. I've used the provided rubber feet, which guide the boxes into alignment without needing to bear weight. Everything fits together seamlessly. The only missing components were eight screws for the battery terminals. I've encountered one issue: one of the JK BMS units gives negative battery temperature readings. I've confirmed it's a problem with the BMS, as swapping the units results in regular readings.

I love the fact you say It is a beautiful sunny morning we have 52A outside, not 22 degrees etc.

I have german blood in my family and hence I like sharp corners made by engineers.

Thanks Andy. I'm glad they meet your approval!! I have two so far and I had no issues with the compression plate. As for the EVA tape, I added it to the epoxy sheet, and it worked fine. Batteries are nice and tight. I like the cable buss bars too, much easier to use from what I see. My boxes didn't have the screen, so the BMS mounted to the front cover, not the compression plate so there was more room available for the fatter cables. As for the screen vs. no screen versions, I prefer the screen less version because then it's just a box that I can monitor from the Cerbo, and not have to worry about a component that I will never use. I should note that one of the two boxes that I bought were damaged, and the included BMS didn't show battery temps. But ... they sent me a new BMS and looking to get a good discount for another box. So with the excellent customer support, I'm going to stick with them. My goal is to have a total of 4, all stacked together using the excellent cart that they offer ... and that box you mention looks very familiar 😉 One thing though ... why the concern for the lack of grounding point? Would this be used to connect box to earth or the negative side. Is this a lightening concern?

4:00 Very intresting, there are different Parts in the box than the one i got from EEL....looks like you got a special edition 🤔 24:03 the bending PCB is very dangerous, because the solder pins of the connector on the downside can touch the metal an get a short. Also the cables from PCB to the cells are touching the sharp corners of the metal, because they are glued sideways on the PCB instead upwards. I can clearly see your rails have the same issue. My compression plate was pretty flat, but the screws were to short to get them into the thread. It was only fitting without the cells. With cells there was a 13mm gap between plate and thread. On both sides and in the middle.

Yes think final price for total battery build will determine if worth it $$$ !

For grounding the chassis, you should be able to use any through hole like the handles or scrape the paint away and use a self tapping screw like you could for negative on a car chassis.

Heya, yeah that looks like a very nice battery box I like it

yay new video and the new v4 cases with JK ... waited for it :) you have our back so we could build :)

Also german blood! I have 3 on order for the last 2 weeks. I hope they are without the bent pressure plate issue. I will let you know when they arrive. Thanks for the quick look Andy. Danke!

You got me thinking about building myself a solar system and battery 🔋 build. 😊 That cutdown on the bus bar maybe the thickness of it for the 200 amps. But someone was not paying attention. Can we say recall is in the future or ask the TEC to check. 😂

Hi Andy, thanks for the video. How about trying something new that hasn't been on your channel yet. For example, to expand your pool fence solar with a 2 axis solar tracker.

Hey Andy! Greetings from Germany! Really great Video again, will post my review for this (in german😉) in some days too, just one hint to 14:25, why don't stick that tape to the sheets, so you don't have to remove them from cells in case any change 😉👍

My 2 sets arrived today, the boxes suffered a hell of a beating but not a mark on anything inside. I also received the cables and not the bus bars. Otherwise i used a very sharp knife to trim down the silly rubber feet to fit the roller base.

22:00 You see Andy, it's not a problem if you don't use all the screws to attach the PCB. Your board is attached with 2-3 screws, why? Another box and once again the same problem with the PCB, the solution was that the manufacturer removed the screws to avoid a short circuit. As a viewer, I was a bit disappointed, you are justifying another company with poorly designed PCBs :/ Regards, Leszek

Don’t forget to put in a few skylights into your garage roof 😋

Thanks Andy

I have 5 white eel v4 (no display) and no quality issues. One NTC was defective but since it is diy I used the one from the original JK bms cabeling and replaced it. My version is different. The JK bms will be mounted on the front coverplate not the compression plate. Also no busbars just the cables. My PCB is labeled 2A and 2B, while yours is 3A and 3B Btw: For the last box on top I closed the holes 🕳️ in the top cover using the oval foam cutouts from the rail foam I stacked them with the rubber feet. But for the first one I set it on a wheel dolly with 48 tiny wheels to carry the 600kg stack

I've got 4 V3 boxes with Seplos BMS, just placed an order for 4 more :) I really like the cases, they're not top quality builds however, but good enough for housing batteries. I will actually mount them in two 19" racks. I ordered rails for Dells M1000e bladechassi to place the cases on.

I've been waiting 3 months for my V3 box (Avialable in EU Warehouse!!!). The quality can still be apparently good if EEL does not deliver and writes untruths on the homepage. If the box ever arrives, that will be my last order from EEL. I will order from Seplos again in the future.

Just a word of warning about the Circuit breaker, I have had 2, 32Amp DC circuit breakers from that manufacturer go faulty. I replaced them with Noark brand.

that is what i bought 3 weeks ago in sunny hot Hamburg. No display. 1:38 - the cables soldered on this bms rail pcbs are too close to the metal compared to previous version were those soldering spots had been more away from the edges. Documentation is not really usefull, the first video was wrong built and is still available on youtube. They do not emphasize on important details like the terminal lug coming from the bms to the cell terminals. The flat metall needs to be on the bottom close to the top of the cell and you have to prepare that while screwing those busbars on the bms. they offer 2 manuals for updating the firmware, both are false and no longer valid cause no one will reply to your message or mail. The 12 page long manual even shows the communication box but with wrong labels. All these documents look like "Andy will find those bugs for us so that we can fix it - maybe, or maybe sometimes" The 5 RJ 45 only offer 1 CAN and JK explains it is the first port on the left, next to RS-485-1 ... stupid mistake but still available on their web page and I have downloaded that one from december 2023 yesterday. after big struggles with growatt inverter settings which have to fit precisely the battery is working. A bit of fine tuning here and there and it might be a good overall product even thought the EVA foam is to thick in my opinion, they also missed to tell the torque and NM for the compression screws. In their videos they did not mention where to put the thermal sensor and I had to redo it. They also forgot to tell us, that the JK BMS caomes with cables for the display which we should not mount if we have not bought that display version. All these tiny details . And your box looked prepared, mine did not arrive in such shape and packing as ssen in 1:41. I did not get the cash nor the manual. But the central metal frame was well aligned , no bend at all. Also your flexible orange bus bars are new as well, so maybe a EEL BOX V4 +. 19:16 your circuit breaker cables also have changed cause I remember very well that i was cursing that they did not show it in their video how to mount the battery terminal right. And now they have changed it again. 24:04 - same quality issues here regarding bended pins in the socket and the rail pcb bending far too much and easily cause the bms cables and plugs need a HIGH FORCE to fit into the socket and click. If you want to hear the click you might become a heartache too while trying to push it in. ALSO ANOTHER Difference: your pcbs seemed to be loose no screws used. Our came half assembled and we did not notice until the end cause we had 2 or 4 scews left in the box and these were from the rail mount. They had not shown that in the manual nor in the videos. What a shame. 27:43 - absolutely right: you can touch the terminal if there is only 1 battery. Easiest workarounds: # 1 on the black I put a black tape on the open entry # 2 on the red (which btw looks like cheap light red here what I had gotten) I used a different technique: I cut away the 2 sides and folded the remaing part to close that side too ( i had no red tape and thought this would be a more compact version too cause I hate the big overhanging part which is useless for only 1 box. # 3 EEL should provide 3d printer files at least as alternative, a more robust connection cause the current one fells quite fragile and does not always sit tight on the terminal. good product, but poor partly craftmanship and missing love for the details.

Great video as usual Andy. With regards to your issue with the busbars being shortened to fit into the circuit breaker, there doesn’t appear to be much different to the size of the lug on the silicone cable

I have the EEL V3 with the JKs which are basically the same but with no display. I had zero issues putting them together....but your comment about the lack of conductive material going in and out of the breaker is now starting to concern me. I may decide to make up better cables when I figure out how. Oh, the feet. I didn't put them on the bottom unit but have no problems getting them in or out on the other 6. They are a bit mashed up after moving them around 3-4 times though. Just be careful stacking.

I still think that the YiXiang is the winner here. My only concern is their DC breaker which if it is indeed directional, it would be a no no. Real fire hazard. Andy, I hope you will make another video showing the YiXiang populated with batteries and tested.

The conductor size of the flex bar is "thickened" by the terminal material. The weak spot is just the line, where it goes in. Not a big issue because all the "more heat" that spot my greate dumps into the bar. And every hole on a busbar also lowers the area for current use. (the screws are not contacted as well to fill up the effect).

Great video: informative and entertaining The phrase you're looking for is "without further ado"

I think the contact area auf the flexible cable to the Circuit breaker isn't bigger than the contact area of the flexible bus bar.I think, the contact area at the main positiv of the battery with a single stud isn't much bigger. And I have multiple EEl boxes, with this feets. It works, and you can remove the box from the top with two persons. But at the bottom I use the plattform from EEl with the rolls.

If you want compression you can only use the epoxy Plates and have a 10mm plywood at the end and at the Front and then add 3 foams and you have great compression at the cells.

Any news on the JK-Inverter bms? Will you make a video when there is a new firmware with new functions available?

Thanks for sharing Andy, I was only looking at these last week. So it's either the EEL V4, or the Yixiang.......🤔

Another great one Andy, I think you need to be a bit harder on them, so the boxes get better and mire affordable. And the end cost comparison between this and the Yixenergy. The Yixenergy looks better amd more options, I think having an opinion on what you feel the cost difference is. You are in OZ, so am I, so let say this Battery case should be $120oz cheaper than the Yixenergy DIY case. I do like the encouragement for them putting all the screws in a simple cheap plastic case.

I recently assembled a similar EEL 48V box but without the display and with the BMS mounted on the front plate. It didn't include the flexible busbars, just the silicone cables. Some of the compression plate screws were too short because of the gap between the plate and the frame. One EVA foam sheet was missing. Overall I'm satisfied. Question: could you please publish the link to the assembly manual? Thanks!

Two parallel circuit breakers would be better in terms of resistance and narrowing the busbar area. The ideal way to connect to a single circuti breaker would be just a ferrule on the cable.

I have 2pcs of the v4.0. No issues with alignment of the compression plate here.

I don't need a box like that. But it is very cool to see what is available on the market. I did copy your Battery Shelf. Not 100% but almost the same. I am very happy with it. I use the "old" JK-BMS versions with rs485 to USB direct to Cerbo. Works perfectly. I do not use the SOC of the BMS. I only use the Data from the Smart Shunt. BUT, if I would buy some boxes I might go for the EEEEEL one.

🙏 Thanks for sharing, looking forward to the change of subject for the next video 😉

Nice Andy,da fragt man sich ob man 2.2023 hätte bis heute warten sollen mit den Batterien und den Boxen bei EEL.

I had problems with the compresstionplate aswell. If i put all eva tape and all isolationplates in the right place, i had a gap between the plate and the frame of around 10mm. So i had to use longer screws and screwed them carefully together. But later it ripped of 2 pullin-nuts (Einziehmutter) with it. It made me crazy. I had to remove them and put new inside. It was really really annoying. Like i ripped off the nuts because of bad documentation and was angry coz it broke my 500€ case and i had to repair it. I also had the bendet pins on the balancer PCBs. Main problem was, i had already mounted all balancer wires and busbars and then i figured out, there was almost a short between 2 cells. I had to grab some isolated pin and bend them in the right place. It was close to get a big spark.

25:54 kenshee boxes have handle holes where you can put the handle only one way and the hole is upside down. 😅 then the handles are wrong way and don’t work as intended.

I had no problems with compression plate or any other mechanical components of same box without display. But I had to put some more epoxy sheets to compress lf280k a little. Epoxy and eva tapes included were not enough... cells are too flat maybe ;)

For the narrowed buss bars at the circuit breaker: The breaker is made to trip at 250A. It's contact area is designed for that, and conducts along the whole contact patch. A thicker buss bar would simply mean more heat storage, since the center of the buss bar between the contact patches wouldn't see much current. The contact patch where the batteries connect to the buss bars isn't much bigger, really.

I have ordered 3 x V4 kits with the MB30 A grade cells all through EEL . I think the function and quality of the MCB supplied could be a issue, but being a single pole and from what I can see in your video Andy, is it standard width ? As it seems slightly wider and most DC breakers come as 2 pole ( Noark ) So anyone that can suggest quality alternatives would be much appreciated . Cheers again Andy Your site is wealth of information 🐸🐸🐸🐸🐸

Yes, it's version 4.1 of the box. I have version 4.0 without display and without busbars to the BMS only the thin silicon cables.

I think the YiX Energy is a far better build. Only a fuse is missing, what you can add yourselves. Update, the breaker alone is not safe enough.

Hey Andi✌️ I think shipping to Australia is always very improper. No package ever arrives safely at your place 😂 I think you should always complain about packages if something is bent.😢 so they you can improve the service 🎉

Thanks for the Video. I still hoping you will do a review of an Apexium DYI box...

Very nice, but I don't like that the communication cable between the batteries runs through the touchscreen. ELL should move the touchscreen closer to the main plus terminal. Also, two main plus and minus terminals would be better as one as well. I wrote the same comment to ELL under their video about this DIY Battery Box and they replied this: ,, This suggestion is very good, we will make changes according to your suggestion when we produce the next batch of shells, thank you. ,, YIXIANG battery box also has the same problem with the communication cable between the batteries runs through the touchscreen.

I have 3 if them on thier trolly. 2 of the V4/EVE LF304 and 1 V2/reptile 305(B) all seplos style bms , the B reps were a pain with the V2 due to swell, the EVE in the v4 boxes were much better, as fat as the feet do on the boxes, they lock the cases together, so your engine lift is about the only way to get them back apart without scraping the paint on the top /bottom of the case.😂

Much ‘to do’ shocking one frog🐸

20:12 That is the least of concern. The contacts in the Circuit Breaker is much much smaller.

I have one of these boxes and the pins on the PCB balance board were also bent and in my instance, they had been pushed through the circuit board and damaged the tracks. My BMS is mounted on the front panel and the silicon cables were even smaller than yours 2x10mm for the negative and 1x20mm for the positive which in my opinion is way too small.

I would prefer double -ve and +ve connectors.

4:25 breaking capacity is 10'000A. No need for a ground connection, if the system is not grounded.

Are the batteries you installed just for the video? As I noticed All the positives and negatives were aligned.

i just received my order of these exact boxes, mine did not come with busbars for the bms connections, and it came with single-pole bus bars for the cell connections instead of double-pole. reached out to Howard, haven't heard back yet.

If the breakerbusbar is over 2mm thick and 10mm wide , I Don’t think it’s a huge problem. It’s all about material (I do hope it’s copper) and the crosssection. 20mm2 should be just safe. Just. It will get pretty toasty at 250A. 4 Watts of heat will be generated in that cm. Luckily, copper is very good at heat dissipation. I am curious how that breaker is made internally. The internals don’t have much wiggle room to get rid of their heat. I wouldn’t be surprised if the breaker melts before the handicapped busbar. That’s a test I would be interested in. Our inverter puts out 240A max, and even 70mm2 cables get warm. And that goes to a big fat busbar and 4 batteries. I can’t imagine how such a relatively small breaker handles such a continued load.

if i wanted to not use the EVA foam and use a solid material instead, what would be a good, cost-effective material to take up that 20mm of space where the compression plate would still... conpress?

I would be worried about the reduced size of that pin on the bus bar, the surface area is greatly reduced. If it is rigid enough it could only be making contact with the corners of the bus bar. Looks a bit dicey to me.

But i still prefer shorter EEL boxes over Gobelpowers 77cm box. Wo has that depth of room in his shelfes?

So : the Yixiang is better, already mounted and less expansive...

You’re not happy no ground bolt but I didn’t see any ground wires on any of your batteries.

Has anyone ever cut open the flexible busbars to see how they are made flexible, is the cross sectional area reduced, and in this particular case where it enters the circuit breaker how much of the terminal actually makes contact with the breaker when the screw is torqued down especially as it is flat, maybe use some engineers dye assemble then disassemble to see how much dye is then missing.

What is the go-to BMS right now? JK Inverter or Seplosv3 (using with Lux inverter). Need to order something quickly. I know JK has 100% soc issues with pylon and Seplos has 96.5% issues and no balancer.

25:35 Box size comparison 700mm to 770mm

Would it be possible to connect two of these boxes in series?

Nope the Vertical EEL box I got from alibaba a few weeks ago arrived damaged and is also twisted, not sure I can even get cells in it No resolution as yet

Hallo Andy, deine Videos sind immer sehr informativ für und hab vieles was ich für mich ableiten konnte. Großen dank und weiter so... Ich nutze auch das JKBMS und nutze auch die Ladesteuerung des BMS. Leider hab ich bis jetzt noch nicht rausgefunden wie ich das korrekt einstellen kann. Sporadisch regelt das BMS mein Wechselrichter korrekt und dann wieder Tagelang nicht und schaltet nicht zwischen Flood- und Absorptionsspannung. Hab auch schon mit der Zeiteinstellung getestet. Aber es ändert sich nichts. Gibt es da vielleicht ein Tip für mich? Grüße aus Deutschland

Hey Andy, last week i ordered the Luyuan case. Its a bit like the Yixuang ?box but with a better dc breaker. You know the Luyuan box already?

Aaaah, time to pick a nektarin and lean back. 😊

the bone has a nice curve to it

My Victron ESS system is now working with this box. I've set up the jkbms according to your suggestions in another video including the float settings. I notice strange behaviour. As soon as the absorption timer expires, the system starts dumping energy into the grid until the float voltage is reached. Then the charge process starts all over again. The BMS is set as the battery monitor. Any ideas what may cause this weird behaviour?

Very nice but despite their advertise in the website they don’t have it in EU warehouse

Thanks for this video. prost

I have 16 cell eve 304 ah Bms jk 200 A How much a what standard courrent should i charge and discharge please ?

😎

Love your videos Andy! Very informative, great info. Have you noticed issues with the JK Inverter BMS giving fake SOC numbers, and the real SOC dropping over time? I’ve heard this is just an issue with Chinese inverters (mines Sofar). Tried contacting jk but no luck? Left my battery for a week and it kept charging to ‘100%’ but the max voltage just kept dropping, 57v to 51v. Any ideas?

Hi Andy, you have some second thoughts about the positive and negative busbars. Did you not get two? A flexible cable and a flexible bar? Why dont you use both. The screws should be long enough to connect them both.

for some strange and inexplicable reason I suddenly really miss the Frankenbattery!?!.

need something like 16S4P or more, building a big battery will not work with 16S1P boxes. Each is one case, one BMS. Having 60kWh or more in one case would be nice, multiple will be stacked. Bet there arent any bigger cases, right ? Threaded rods and plates it will be.... :-)

Andy with who from EEL do you have contact on Alibaba? I don't seem to come anywhere with Season:(

They have one Flaw, not "real" 19inch Rack mounting .. only I call it "passive" rack mountable like on some universal Rack Mounts where it is only sitting on top of it and not sliding in with rails. Maybe I will call them when im on the way to build it for my house at the end of the year.

No concern for me with the busbar narrowing.

Andy, why don't you glue the EVA square to the epoxy square? André

Moin 👍👍👌

Is there a good reason to chose between an assembled box, a kit box and a row of cells on a shelf?

Why do you need a ground on a DC source?

Hi

Looks great, but still not seeing the love for DIY when you can buy a grade A based battery for just a few hundred more. I guess if your time isn't worth that much. I'd rather spend the time installing a new solar panel rack.

Is it an obligation to put de cells and parallel before mastering them in serie even if they are on the same voltaje ?

🐸🐸🐸🐸

Andy, could you ask jk to include support for rs485 pace and pylontech soon. Please 😢

I am still waiting for the test of the vertical Version 🥺

Problem with PCB is again. People who buy this. Check this PCB in every DYI BOX. Check voltage or use plastic screws. Always think. What can,t went wrong, it can be done.

In winter it only gets 30 degrees C down there? 😅

🐸🐸🐸

i placed my order about a month ago, ad said it came with flexible bus bars for bms, didn't say anything about cables. all the videos and instructions have shown bus bars. I'm going to be VERY unhappy if it shows up with cables instead of bus bars.

These cases are too late to the market (same with jk inverter bms). I built my 3 boxes from wood, 100% DIY. But it works fine.