4s BMS 120a LifePo4 Battery Management System for 12v DIY Batteries, Programmable, Bluetooth Included.

(5 customer reviews)

$113.00$149.00

  • Includes a Bluetooth communication module.
  • BMS For 4 cell, 12v volt Lithium-iron-phosphate DIY batteries
  • 120 amp continuous charge or discharge current
  • Low Temperature Charging cutoff at -1c
  • Fully programmable with IOS app, Android app, or Desktop app
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Description

We now have a comprehensive user’s manual for the BMSs! 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 Denver, CO or Naples,  FL. The BMS is manufactured in China.

To view or change Parameters, there are 3 ways to connect to the BMS.
1. Bluetooth module to IOS app. The app is on the Apple app store, it is free to view operational data, but costs $6 to view and change parameters.
2. Bluetooth module to Android app. (download this version, don’t get it from the play store)
3. USB module to PC/desktop application. This application is free

IOS app is on the Apple app store. Search for “xiaoxiangBMS

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.

Additional information

Weight 1 lbs
Dimensions 6 × 4 × 1 in
Wire Size:

10 gauge x 12" (Standard), 8 gauge x 12" (+$22), 8 gauge x 24" (+$34), No wires (-$2), M6 Threaded Terminals (+12)

5 reviews for 4s BMS 120a LifePo4 Battery Management System for 12v DIY Batteries, Programmable, Bluetooth Included.

  1. RONALD MARK HYMAN (verified owner)

    First, Overkill Solar, Steve, does a great job at customer service. Very, very patient answering all of my beginner questions and holding my hand through the purchase process. I received my fortune cells and 2 BMS’s quickly and extremely well packaged. I had my BMS’s upgraded with heavier and longer cables and the quality of the work is outstanding. And note that the customer service has continued cheerfully after the sale. I heartily recommend Overkill Solar as a go to source for Lithium cells and Battery Management systems.
    Ron in Mexico

  2. Randall Reed (verified owner)

    Bought this bms after my Daly was doa. Great product and easy to use. Very fast shipping. Great resources on site. Thanks

  3. Dave

    Just finished installing two 120a BMSs on my batteries. Followed Steve’s directions and was pretty straight forward. I got the 8 AWG longer wires which worked well for me. Blue tooth connect with the App was flawless. Discharging batteries now to see how things go.

    I have it mocked up on a bench before it goes in the van to work out bugs.

  4. Dave

    Installed two 120a BMSs for my batteries. Super easy to install and the Bluetooth connect was perfect. Adjusting the settings for my battery was easy once I paid the $5.99 for the deluxe version of the app. Discharging now to see how things track.

  5. Lynn

    Happy with the BMS, works great, easy to program and the IOS app works well. This is my 3rd BMS of this type. I have a questions about the app. What do the length of the blue bars mean? They don’t correspond to the voltage. And the “balancing” note does not appear every time the voltage delta is exceeded. One battery has issues with one cell getting out of balance. Both at the high end and the low end of the voltage cycle.

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