Overkill Solar 12/24/48V BMS: High Quality and Beginner Friendly!

Affiliate links for this beginner-friendly BMS:

My favorite LiFePO4 Fortune cells:

More information on how to build your own battery and other cell options:

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*Does off-grid solar confuse you?*
Check out my DIY friendly website for solar system blueprints and product recommendations, and so much more!

*Join our DIY solar community*
#1 largest solar forum on the internet for beginners and professionals alike:

*Check out my free book*
Best-selling and beginner-friendly guide to 12V off-grid solar!

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*My Favorite Online Stores for DIY Solar Products:*

*Current Connected*
My favorite USA Distributor! Best Prices for EG4, Victron, Solar Panels and high quality components. Fantastic customer support and fast shipping:

*WattCycle*
My favorite 12V budget battery!:

*Epoch Batteries*
My favorite high-quality 12V battery:

*Watts247*
Need international shipping for large batteries and big inverters? Check them out!

*Rich Solar*
Budget 12V Inverters and MPPT:

*Battery Hookup*
Cheap used lithium cell deals:
5% off code: diysolar

*Contact Information:*

*FTC Disclosure Statement and Disclaimers:*
Every video includes 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,

[WillProwse]

3:04 12V Battery Build
8:10 Bluetooth Connection
10:39 Charging/ Low Temp Protection Test
11:52 Max Current Test
12:35 24V Battery Build
15:29 24V BMS Low Temp Charting Protection Test
16:16 24V BMS Continuous Current Test
17:25 Max Load Till OCP is Triggered
17:56 Conclusion

This video was meant to be a review of the BMS, but I just realized that I built 2 full function batteries! I will show this video to beginners from now on. I hope this video helps you guys :D


*Does off-grid solar confuse you?*
Check out my DIY friendly website for solar system blueprints and product recommendations, and so much more!

*Join our DIY solar community*
#1 largest solar forum on the internet for beginners and professionals alike:

*Check out my free book*
Best-selling and beginner-friendly guide to 12V off-grid solar!


*My Favorite Online Stores for DIY Solar Products:*

*Current Connected*
My favorite USA Distributor! Best Prices for EG4, Victron, Solar Panels and high quality components. Fantastic customer support and fast shipping:

*WattCycle*
My favorite 12V budget battery!:

*Epoch Batteries*
My favorite high-quality 12V battery:

*Watts247*
Need international shipping for large batteries and big inverters? Check them out!

*Rich Solar*
Budget 12V Inverters and MPPT:

*Battery Hookup*
Cheap used lithium cell deals:
5% off code: diysolar

*Contact Information:*


*FTC Disclosure Statement and Disclaimers:*
Every video includes 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

[dave]

Love the way you demonstrate each step. You’re an awesome teacher Will.

[mindovermatter]

Thank you for telling people about wearing safety glasses around the battery terminals. I normally always wear my safety goggles when doing any kind of work but it it's saved me the other day. I hooked up a inverter accidentally switching the polarity and the moment the terminal touch the stud all I could see was a blue flash of light and the only thing I could think was you talking about the story of solder hitting you in the eye.

[paulatreides]

Just bought my Overkill BMS last night based on your previous recommendations. Then, I see this video today. So glad I went with quality equipment👍. Waiting for Overkill to come out with a 200-250A BMS 😉

[bratbard]

I knew basically nothing about solar, making battery banks, or their related equipment before watching your videos. You are an excellent instructor and the way you take the time and effort to include every step in the process is incredibly helpful.

[malk]

Time for me to finally express some appreciation for your videos: really helpful. Building up my confidence to build a battery for our upcoming solar installation. Thank you so much for churning out these videos!

[loveworldnationcyber]

Will you've taught me a lot on building as a Kenyan i appreciate your teaching skills .im really looking forward to building my first battery Thankyou

[redstorm]

I would love to see an in depth explanation video on how to use the Xiaoxiang BMS software and setup procedure to get best lifespan from lifepo4 battery.

[scothunter]

I’ve been running the 12v version for six months now and am extremely happy. Very easy to install and setup. Having the BT with app on my iphone makes it so simple to monitor. Had only one problem - the bulb on the temp sensor broke and he was VERY quick to send me a replacement. All in all a great product and great service. Heartily recommend.

[mrhypno]

Hey Will! I know this vid is 3 years old, but Id just like to thank you for all the great info on solar systems in general. This vid lead me to the Overkill BMS . I really didnt want to spend a fortune on Batrium or other BMS's that are like $1000! For all the features and performance, you really cant beat it. Im wiring up a 16s Eve 280AH pack to play with the BMS. If all goes well ill be getting another for my custom built 10Kwh cartridge style 18650 power wall. Ive been running it for 6 years with no BMS, just balancing it twice a year or so, but with the affordability and reliability of this BMS, im sure ill be getting a second one. The good thing about this vid being 3 years old is that Overkill is still in business so they can be trusted. Once again, Thanks!

[marlomontanaro]

Just built my first battery pack and after much deliberation between all of the BMS models out there, settled on the Overkill 4S 120A unit. What a great decision. Works perfectly, I can concur on the Bluetooth range, and just easy peasy to get everything up and running. The app just works. Can't be happier. They even will pre-install B- and C- leads to the BMS depending on your needs. And keeping true to the "Overkill" name, you can easily reduce the parameters as needed. So building a smaller pack is just as easy and you'll have a BMS that will allow you to increase the capacity of the pack later when you gain experience with handling this much energy.

[Aconda]

Brutal. Super good video. Very nice BMS, I want one. The lid of these batteries gives a protective and attractive appearance.

[drgloverable]

I moved to these from Daly Smart BMS. Its so nice that it just works. One bug i noticed is that if you dont properly enter the parameters in the BT app, the BT can behave in a strange way.

[onegreenev]

I was successful at connecting up my 300 amp ANT BMS with monitor without smoking the board and charged my 48 volt Leaf Powerwall using my PowMr Charge controller. I let the BMS stop the charge and it worked perfectly. I was able to figure out how to connect the leaf modules to the BMS and feel very confident moving forward. Next is to test the inverter with the setup before going to a huge battery bank for our off grid AC coupled setup. I have two sets of solar panels. One on the house which is 7.2 kW and one that will be ground mounted and 6kW. My home system does not seem to be putting out as much as when we first put it up. Im getting at best right now about 36 to 38kWh during the day if it is clear all day. I used to get 42kWh during the summer. Our system has been up and running since 2005. Im happy with the design of my power wall. A 6.6kWh pack if the cells are at 58 ah. I Have not done a capacity check yet. All cells are within .030 of each other. I did bottom balance all my cells/modules. I let the go until they were stable. Max charge to 8.1 volts.

[IAMAWAREAIM]

Sorry, my last comment was absolutely wrong... newbie math.
Parallel adds amps and volts remain same
So my example cells are 3.2v 280ah
In parallel is 3.2v560ah
Four of these in series is 12.8 volts 560ah.
Thanks Will, I've learned so much from you. Your a really good teacher.

[LarryL]

I have this BMS for 8S! Overkill Solar was super cool to work with and he shipped and delivered within the week using USPS Priority. Upgraded to the 8ga 24” wire too - which is probably... overkill.

It surged 4100w (170A) for my dryer as well. Even my 2000w gas generator failed at starting that motor. I’m glad I chose this BMS after watching your past videos. As much as I wanted a Chergery BMS it was just too much trouble when you factor in relays, etc. I trust the mosfets for my application and it’s barely more $ than a Daly BMS that doesn’t have all these cool features or reliability/quality control. Thanks Will!

[galactikbutterfly]

Thank you from boomer notech artist i will not be making my own batpak yet but bcuz of your thorough study and teardowns thus recommendations, I have learned enough to start with 2 100 watt panels and will choose a battgenerator for my bugout/camping /mobil massage/art studio trailer ... I am confident that you only promote the best ! I’m glad that you are getting compensation for your extensive work you have come so far ... I would love for you to write a book ( in your spare time ) about what you went through inspite of your difficulties ...what a no excuses life journey you stepped up and preavailed an inspiration to all young folks who feel lost and don’t think they have anything to contribute to the world bravo

[petrsuchomel]

So far so good for high quality. One wire missing on the connector, found another to replace the missing, connected BMS, one wire burned. Took apart BMS, a tin bridge shorting several contacts together, BMS sent cells into short - no surprise I saw the smoke. Test slip seems to be generated without connecting the actual BMS ... Communication with the seller ... well, it all sounded like I do not know what I was doing, huh.

[LonnieWormley]

I like this video. I bought your book in 2018 when I first discovered your channel. I just bought a cargo van and I am going to need a battery bank to run a induction stove and lights. You have been such a help in understanding the solar and battery world. Thanks

[sojourner]

I like that the Bluetooth module is included!