Dirt Cheap 24V Preassembled LiFePO4 Battery: Beginner Friendly Tutorial! 

Signature solar just watched the video and will include hardware for each pack! Thank goodness. DIY Parts List (affiliate links): Battery Pack: signaturesolar.com/eg4-8-cell-pack-lithium-cells-25-6v-100ah/?ref=cPwLcVc0SW-BjN 24V BMS: overkillsolar.com/%20%20product/bms-100a-8s-lifepo4/%20%20?myboi=187467879 48V BMS: overkillsolar.com/product/bms-100a-16s-lifepo4/?myboi=187467879 Battery Box Terminals: amzn.to/3ikFKrk Ring Terminals for balance lead: amzn.to/3D0G4Fw Ring Terminals for larger wires: amzn.to/3N90UH6 Tools for this project: www.mobile-solarpower.com/tools.html Battery Schematics: www.mobile-solarpower.com/design-your-own-12v-lifepo4-system.html ~~~~~~~~~~~~~~~~~~~~~~~~~ Does off-grid solar confuse you? Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-solarpower.com Join our DIY solar community! #1 largest solar forum on the internet for beginners and professionals alike: www.diysolarforum.com Check out my best-selling, beginner-friendly 12V off-grid solar book (affiliate link): amzn.to/2Aj4dX4 If DIY is not for you, but you love solar and need an offgrid system, check out Tesla Solar. Low prices and great warranty, and they can take your entire house offgrid with their new Powerwalls: ts.la/william57509 ~~~~~~~~~~~~~~~~~~~~~~~~~ My solar equipment recommendations (Constantly updated! Check here first): 12V/48V Lithium Batteries: www.mobile-solarpower.com/solar-batteries.html Solar System Component Directory: www.mobile-solarpower.com/solarcomponents.html Plug-N-Play Systems: www.mobile-solarpower.com/full-size-systems.html Complete 48V System Kits: www.mobile-solarpower.com/complete-48v-solar-kits.html DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-solarpower.com/solar-friendly-air-conditioners.html Complete 48V System Blueprint: www.mobile-solarpower.com/48v-complete-system-blueprint.html ~~~~~~~~~~~~~~~~~~~~~~~~~~ My Favorite Online Stores for DIY Solar and Coupon Codes: -Current Connected: SOK, Victron and High Quality Components. Best prices and warranty around: currentconnected.com/?ref=wp -Signature Solar: Cheap Server Rack Batteries and Large Solar Panels: www.signaturesolar.com/?ref=h-cvbzfahsek -Ecoflow Delta Official Site: My favorite plug-n-play solar generator: us.ecoflow.com/?aff=7 -AmpereTime: Cheapest 12V batteries around: amperetime.com/products/ampere-time-12v-100ah-lithium-lifepo4-battery?ref=h-cvbzfahsek -Rich Solar: Mega site and cheaper prices than renogy! Check them out: richsolar.com/?ref=h-cvbzfahsek -Shop Solar Kits: Huge site with every solar kit you can imagine! Check it out: shopsolarkits.com/?ref=will-p -Battery Hookup: Cheap cell deals bit.ly/2mIxSqt 10% off code: diysolar -Watts 24/7: Best deals on all-in-one solar power systems, with customer support and distribution here in the USA: watts247.com/?wpam_id=3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Contact Information: I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar FTC Disclosure Statement and Disclaimers: Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :) DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program, An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com

Will: "Let me show you beginners how it is done...: Will later: " Oh my gosh, the battery is working! How cool is that?!" :) Love when the teacher is excited that it actually functioned properly when he finished!

Thanks for another great beginner video! I’m sure you have a lot of new subscribers that will love this. You have a wonderful way of explaining things that make it so easy for people new to the industry. Your bms hook up instructions are second to none!

You sound so confident putting it together and so surprised when it works. I love it!

This is what I was waiting for! Just ordered 1 today! Thanks Will. Been watching all your videos for a year. I have a camper van. Ford Transit. Good to go!

Hi Will, Great video! Brought back many memories of the early days in your camper when you did many beginner videos for us. Enjoyed watching!

Excellent video Will! I’ve run the numbers several times on those battery packs trying to come up with a more cost effective solution versus buying server rack batteries but by the time you add the bms the savings just aren’t there. This is especially true if you start to take into account the features like built-in breakers, communication ports for the BMS, etc. In this video you implied that there may be a way to build a large battery bank using fewer BMS‘s. Obviously that would help make the whole thing more cost effective. I would love to see a video or hear your thoughts on a big DIY build that might compete with the 30 kWh a full server rack from EG4 give you.

Thanks Will. I built one with your guidance. And I did the classic "How cool is that, It actually works!" It should power my refrigerator for ten days in my camper van. I added two DC to DC converters to step down to 12 volts and one to step down to 5 volts. Bought the Aim battery charger that can recharge it at 1000 watts. Might buy the Zero Breeze air conditioner.

I'm building my first battery next month, I've been watching a lot of your great videos to learn as much as I can.

I'd love to see a thermal image of those welded bus bars under heavy load! Probably a much better, more consistent connection than we get with the old-fashioned bolt-down individual bars. How about a quick comparison video? (I'm loving how fast this field is progressing! Thanks for keeping us up to date!)

Very informative I keep waiting for the price to drop. This seems like a great deal. Thank You

As always a great, nononsense easy to follow build video. Thank you!

Another awesome video! Thanks for guiding us through these budget-conscious solutions instead of just pushing the latest do-it-all gadgets.

I love the intro so simple but it works. Each one just a little different like Kramer coming through Jerry's front door. Best one was when will was on the bench dragging the pack across it.

😎 How kool is that!! It actually works!! Thanks for the Sunday morning smiles. ✌️

Love all your videos and thankful for them! 💙

they don’t seem to sell them anymore 😭

As always, a high quality and very approachable video.

Hey Will, Another great video. I purchased mine from Signature Solar and received last week. Very glad you verified the thread size big help. Also have the same OverKill BMS have not installed due not having hardware. I'm in the process of building a mobile Solar Generator. Purchased Growatt 3000W 24V from Signature Solar also. Going to install inverter and battery on Hand Truck. Purchased yesterday 4 Slfab Elite 370W solar panels for the system.

Another great informative video Will !👍💪

I'll love to see you get 3 or 4 of this pack and show how to parallel connect them not just on the main + and - terminal, but all the terminal on each cell like parallel connect the balance leads.

this was fun! I’m not interested in doing this, but I could understand everything you were saying. plus you are always very articulate.

Great post my friend. You make everything look simple/easy. 💪😇

Will, please see if Signature Solar will have these battery packs for sale again.

You are a great Salesman and a great teacher 👨‍🏫………. Thank you for sharing. 😎

Thank you Will, great video!

I bought 8 of these in January and they are working flawlessly 🙂 I was just going to by 4 more but they are no longer listed on Signature Solars web site... oh well. For those that bought them the bolt sizes should be M6x10 for terminals and M5x6 for balance leads.

Beautiful and meticulous demo 👌

Very well presented. Thanks for this.

Always interesting and informative.

So technical and detailed! 👏🏼👏🏼👏🏼🎯

I got some of the "extra" smoke out of a BMS when I plugged the balance connector in without ensuring that each balance lead was wired according to the diagram. The easiest way to make sure that it is correctly wired -- before plugging the balance connector into the BMS -- is with the multimeter negative lead on the black wire connection and then touch each white wire with the positive multimeter lead -- in order -- and the voltage should step up at each white wire .... 3.6v, 7.2v, 10.8v, etc. I got lucky since they had programmed extra smoke in the BMS and it did no harm -- the first time.

I'm building this pack and how could you not love this BMS. The paperwork is hysterical. "If you need help I will help you, If you screw up I will help you, if you kill it I will refund your money , send me back the dead BMS" LOL you can't go wrong. The only thing I will do is use SS set screws and bottom them out at 15 inch pounds. That way when tightening the nuts down I can hold the stud made by the set screw still. That way there is not chance of stripping the threads. Shipping of the BMS was very fast.

This would be great in a weather case for the fishing people who love 24v trolling motors.

Hey Will! By chance I bought this pack a month ago and used this BMS for all the reasons you mentioned. It works pretty well and has full capacity.. I would recommend it!

Awesome video ! Indeed, the price is very tempting !

...I think you're getting spoiled with all the rackmount prebuilts. Your milk crate battery got me started in this crazy solar journey. Another cool video - thanks.

Can we get updated links? Is this not sold anymore???

Always great information Will thank you brother...

Great step by step instructions

I have two of them, neatly packed inside of Stanley tool boxes :)

I received 8 of these today, shortly after ordering them about 2 weeks ago they took them off of their site and no longer offer them for sale. Good thing I acted fast.

These batteries 🔋 and your videos are getting better and better. Wonder about a Victron BMS with these welded battery terminals…..?

Just to let everyone know. Everyone is shipping fast. I ordered the battery on April 14th 2022 and it arrived on the 19th. It did not have the hardware packed with it, but it doesn't matter I will be using studs instead bolts anyway. I ordered the BMS on April 14th and it arrived on April 18th 2022. I paid the extra $10 to have the lugs crimped on and would recommend it to all. BTW due to my dual use of this pack I need it as a small lightweight (somewhat) pack some of the time but plan on adding another battery bank when I'm out in the middle of no where and can't set out solar. At that time I'm going to have to decide whether to switch between batteries or ( I know I know ) run them in parallel. This pack was just too well put together for me to pass it up. It fit my needs very well. Thanks for the heads up and tutorial.

Glad I ordered this stuff just barely before this video. Hate when you sell my stuff out! Lol

Thanks Will! As always, entertaining. You can tell people take you serious, the Overkill BMS is sold out! That happens a lot? THANKS WILL!

Anyone know if these are still for sale anywhere? The link goes nowhere on the signature solar site.

Awesome and interesting setup, thank you very much. :)

Love it!!! Beautiful

Very nice. Thanks. I hope that will work on my sailboat?

Hello from Sacramento CA. I was cruising your channel last night expecting a new video and missed it and I am scribed??? Will definitely be looking into this. Just about done with the water damage/seal of my 1970 airstream remodeling. We are putting the bedroom in the back and the bathroom in the middle. Not sure of the position of the bed. So were taking it out this week to decide if we like the current mockup. This will decide how and were the batteries will go in the trailer. I plan on putting in floor lockers for the batteries and that footprint will change depending on the placement of the bed. And the more low slung weight closer to the axels the better. This is a major systems upgrade and 5years of planning on two different floorplans to even out weight distribution I have already taken out over 60 feet of copper pipe. I am planning on loadsharing the trailer and the boat with the houses electrical grid. I mean why have them sit idle. My goal is to be grid free but have the option to reconnect to the main power grid when and if we move. Great job Will quick and to the point.

Hey Will, if you could do a video of connecting 2 of these in series to make a 48 volt battery with a 48 volt BMS that would be great!

I think a nice diy replacement for this type of compression system would be a couple of cheap endless loop rachet straps, and some cut pieces of pvc. But for sure that disposable packing strap sure is a nice way to make the compression pack.

Well done.

GREAT , easy to understand video ! Great job ! .. gubs

Question- Hey Will I love the depth of information you provide and the way you explain the info . My question for you is if I'm wanting to make a solar set up that is going in my work trailer wanting it to be able charge all batteries for cordless tool the biggest batteries i have are the milwaukee 12amp ones , but I also like to be able run my table saw and chop saws and all corded tools from this and if the ever blackout I like to be able run extention from trailer to the standing freezer and chest freezer and fridge and be able to run these continuously, if have sun every second day to top batteries back up . Was hoping to be able to do this for under 3-4 thousand dollars. I sore that you said those 250w panels that $60 where good also I have a 3000 w inverter already , but if you can't let me know if what I'm trying to do is even possible? Thanks heaps for your help on this will

I'd suggest a hydraulic crimpers for battery wires; learned my lesson hard way (crimp worked its way loose over a year and got a bit melty on wire). Luckily caught it during high load test (100amp) before the setup made it into my RV. Cheap hydraulic crimps like 20-30 bucks on amazon now.

Will you are the Best!!! : ) Will, can you give us an example, on how to build a big battery bank 48v with these packages, and with high quality BMS. As you said at the end of the video.... Thank you very much!!!.

Hey Will @DIY Solar with Will Prowse I love how you explain things in your videos. My starter solar was set up based on your tips and advice. Is there a way you could do a video of how to hook up an off grid cabin through a junction box with an all in one controller/inverter? I'm ready for an upgrade but not sure the best way to do this.

That's pretty nice!

Hey Will, just started watching your videos! Thay are very helpfull 👏🏼👏🏼👏🏼. Love this battery bank! I own a boat w a 24v house system and want to set up a 2500W solar system (limited space for panels). Do you have a video w similar system w set up and equipment recomendations?

Very cool, and quite simple :)

Hello Will, I'm looking for the leads for the cell meter 8 and for a Daly BMS 200a is or I should say 9s . I'm going to be building two 24volt 200ah lithium batteries so I need two leads for the BMS s

You sold me on these batteries, cant wait to get my packs and start building. Thanks for sharing all of your videos, they have been very helpful for me while learning, and putting together my solar set up, Dis I mention your videos saved me a lot of money in this journey.

I saw this battery pack when I was in search for a battery, but with the cost of shipping, and a BMS, the price was practically the same as an Ampere Time battery. I went with the fully built battery instead.

I like the battery builds, I'm looking to build a system to power outdoor lighting. Any chance you could build a system for your back yard?

Will, Can you show in a video how signature Solar is using these 24 V 100 ah packs in their 200 ah modules? I am curious as to how they are wired with the BMS

There you have it!!

Hey Will A little off topic, but, what is your recommendation for a mppt controller for a 400 watt rv system? Thanks

Good Tube Any chance of a long term review of the Renogy DCC50S with MPPT?

Hi Will. Could one cut the middle bus bar to make 2 parallel to create a 12 volt battery? Thank you!

Last week just bought 16 of those packs … didn’t realize they had welded bus bars…. Planning on using a 32s BMS ( any recommendations?) to supply a 96 volt load. Others will be configured for 48 volt. Here again any recommendations for the BMS?

Home Depot has a Stanley tool box that this fits. It is 19 x 10 x 10. Tractor Supply has an older version that I own.

Where did you get the 8 gauge wire stripper? Anything over 10 gauge is hard to find. I do prefer the heatshrink ring terminals for the balance cables, but they do require a different crimp tool. Top balancing is not that hard if you have the correct power supply, just charge up each cell individually, certainly tedious and time consuming, but not hard. You could also use an active balancer to speed things up. Likely even the small balance current from the BMS would balance them after a couple of cycles (just resist the urge to think more is better, leave it set to balance above 3.4v). Likely the cells are very close to balanced, and the only difference is the per cell self discharge rate that should be very close.

I'm currently building 4 48v batteries from 8 of these battery packs. I purchased the 48v version of the bms you used in this video from overkill solar. It all seems quite straight forward except for 1 thing. The wiring diagram that came with the bms clearly shows the BC0 lead connecting to the main negative, then BC1 connecting to the 1st cell positive, then BC2 connecting to the 2nd cell positive, then BC3 and BC4 connecting to 4th cell negative and positive. Then BC5 and BC6 connecting to cell 6 negative and positive, BC7 and 8 connecting to cell 8 negative and positive. It continues like that, skipping every other cell and connecting to negative and positive. The wiring diagram you show for the bms you have shows the same, but you wire every balance lead to the positive of every cell, just like every other bms video I've watched. So, which way should it be, the way the diagram shows or the way you did it?

Great option. Considering a bms, and 3000 inverter, for under 2k-ish, what a possibly 🤔 aside from a $5000 blue yetti at 5k watt hour.

Hi Will, what would be the physical size of these? I want to figure the space 6 of them would take.

Hi, Why would they be in the same state of charge? Wouldn't that only apply if they were connected in parallel?

I plan on staying out for a really long time up in the northwest territory

Would this be a good option for a rough service environment like an off road car and a boat.

Looking at converting to these from AGM in my van in the near future can I put up to 4 sets in parallel with each set having its own 24v bms also for the blue tooth can you show the app setup

Excellent video as usual. I would like you to show a home built battery to add capacity to a power station, like ecoflow, mango, etc....since the addon batteries they sell cost almost as much as the power station.

What is the easy way to replace the 3 lead batteries (1 chassis and 2 Coach batteries)? I want lithium with cold weather protection. Any direction would be appreciated.

What would be the most appropriate BMS setup for having two of these banks in parallel? What are the problems with having two BMS units in parallel?

What would you do for the every day travel trailer

Could i use this beside my 24vlt 200ah batts with the daly???

Hey Will, I have been enjoying your videos. Would you have any advice on building or purchasing the appropriate battery for my kayak trolling motor. I will be fishing a maximum of 8 hours running a 12v 46lb thrust motorguide. Thank you in advance for any info you may offer.

I would like to know if you can make a recommendation for batteries for a marine application. I have twin diesels and 3 batteries. I need them to be able to crank the motors and then run the electronics. I’m more concerned with practicality and safety as well as cost. Not going to have a completely solar setup, but may expand to that in the future.

You're a god, Will; thank you always! One question, would adding dielectric grease to the stripped wire be beneficial before crimping on connections? I've experienced corrosion in the past with lead acid; maybe not as much as issue with lithium. Blessings 🕯️✌️

Hi and thank you for your awesome videos. I been wanting to build my own battery and I found this video. I have a all in one 24v 3kw inverter that clearly says for seal, agm, and lithium battery only. I was wondering if a 24v lifepo4 with a BMS like the one you are building on this video will work with my inverter? The battery connector on my inverter is only one connector so is has charge and discharge function. Thank you.

Wunder if I could disconect it from 24V and put parallel to have a 12V system with the same (?) BMS Thank you Bernie

Enjoy your videos very much. Can I ask a question? I would like to build a battery fed system for some motorized doors at my house. The power will be supplied by roof mounted solar. The idle wattage draw is 7 watts but when the doors are activated the draw shoots up to 150 watts for a few seconds during operation. I have a 15 amp hour lithium battery now along with a 20 watt solar cell on the roof. The battery runs out of juice by morning, So I know I require a larger battery and probably a larger solar cell. How much larger does it need to be? I think I'm close I was thinking probably a 50 amp hour lithium battery and a 50 W solar cell would probably do the trick do you think I'm on the right track?? And also do I require a charge controller for this setup or can I just rely on the BMS in the battery and the solar charger?

Nice video

DARN! Wish I would have seen this before I ordered 4 Chins 12.8v 100ah batteries

Cool stuff. Do you have any recommendations for a similar setup for a 12 volt system?

Your timeless !Thank you, and the only thing wrong with you is your not my son, lol.

I have already purchased 2 400ah 12.8v chin’s batteries I was just wondering if it was over kill. I have a inverter generator for ac use

Can I use Lifepo4 battery for Home Inverter/UPS instead of Lead acid batteries.

Hey Will, if I pair this with the MPP solar LV 2424 and add some panels with this be a pretty awesome system for a small off grid cabin? Thank you so much in advance

Will, I need two or more of these batteries and need to wire them in series get say, 96v. Would I be able to use a separate charger for each battery in the series? Thank you for your time and videos. Take care.