Description
User Manual: Click here to download the manual (PDF)
BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries.
120 amp continuous charge or discharge current.
Low Temperature Charging cutoff at -1c.
The Apps allow you to monitor SOC (state of charge), Current, Voltage, cell balance, temperature, and more.
Bluetooth Module is included, Balance wires are included, USB module is an additional purchase.
Fully programmable.
If you choose to add crimped copper lugs, the high current wires will be hydraulically crimped into a single tinned copper lug on each side, and finished with heat shrink tubing.
Final assembly, testing and calibration is done in Naples, Florida. Units with 8 gauge wires and/or crimped lugs are assembled in Naples, FL. The BMS is manufactured in China.
To view or change Parameters, there are 3 ways to connect to the BMS. All 3 applications are free.
- iPhone App:Â Â Overkill Solar Mobile App
- Android App:Â Â Overkill Solar Mobile App
- USB module to PC/desktop application.
Click here for Software Downloads and Support Resources.
A great resource for general DIY power education is www.Mobile-Solarpower.com
FYI for experimenters: The BMS communicates with a 5v TTL UART at 9600 baud. It is directly compatible with Arduinos, etc.
We have written a new Arduino library for the BMSs, now available on the downloads page. The beta version allows you to read all the monitoring parameters and switch charge and discharge on/off. Future releases will have full read/write capability. A python library is also in the works.
Brian P –
So far I am really liking this BMS and the service/warranty provided by Steve. My first time building a “battery” using 4 LifeP04 cells I got from a buddy of mine. Great instructions, easy to set up. Bluetooth works great as well. Thanks Steve!
Steve Stalker –
Overkill is one of the best company’s I have purchased electronic devices for projects. The bms I purchased 2 years ago worked flawlessly until I decided to move the cells to a new container. The cells came from China and I forgot that red and black don’t always mean the same thing. So yes I hooked them up to the bms backwards and burned out the bms not once but twice. Overkill noticed what I was doing when I sent in a picture and we got things straightened out. What other company would honor a warranty 2 years later for my dumb mistake. I would highly recommend Overkill for your BMS needs. Thanks Overkill.