LiFePO4 Battery Management Systems (BMS)

 If you want to know how to build your own battery, check out this page: Click Here
If you need raw LiFePO4 Cells: Click Here
​(I make a commission for purchases made through the links below)

Overkill Solar 12v 4S 120A BMS w/ Low temp Charging Protection!!

So happy to find this. I have been testing BMS for about a month and many of them failed/were hard or impossible to program/heated up excessively etc. 

Then I found this BMS. It is used in medical devices and it's top quality. I tested the low temp charging protection, over current protection and voltage cut offs and it passed all of my tests.

What you need to know when using it:
  1. 1. Overkill Solar hosts the most recent app versions on the downloads page. Android users need to download the .apk file and allow 3rd party apps to install. 

    2. The standard 10ga wires get hot under constant load, so overkill solar offers it customized with 8ga wires, or with no wires in case you want to solder them yourself.
And that's pretty much it. You will love it. It connects to the bluetooth instantly and its easy to program how you wish. 

Click here to buy from Overkill Solar (American distributor with customer support)

​​And below is the APK file (to install on your android device) so you can program the low temp cut off settings:

Version 2 firmware:

android_app_xiaoxiangbms_3.1.1015.apk
File Size: 5808 kb
File Type: apk
Download File

Overkill Solar 24V 8S 100A BMS w/ low temp charging protection

Same BMS as above, but in an 8S 24V configuration! We have been waiting ages for this, and it is finally available.

Click here to purchase now

8-16s LiFePO4 BMS that works really well

I have tested this one for months and it works really well. Has low temp cut off and lots of other features. You can program pretty much every feature of this bms, but the hardest part is to "activate" it. There is a method by exposing it to a low voltage, but the easiest way is to stick a charger on the bms output lead (just add a battery charger like you normally would) and it will activate instantly. After that, you are set! 

Also, the bluetooth connection password is 1234

Click Here to check it out on ebay (sponsored link)

Daly BMS (No Low Temp cut off, but easy to install)

These work great as a bms, but your charging sources need a low temp cut off. Learn more about how to use these by clicking here

This is still my go-to BMS. I don't care for data logging or changing settings on my BMS, so the Daly works great. I am running them in parallel in my shed at the moment without an issue. Very simple and works well!

​Click Here for a 12v, 100A Daly BMS

Click Here for a 24v, 80-100A Daly BMS

Click Here for 48v, 80-200A Daly BMS