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

(1 customer review)

$115.00

  • 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

23 in stock (can be backordered)

Category:

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.

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.
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.

See the support forum at Reddit.com/r/OverkillSolarBMS for more help and discussions.

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.
The protocol is similar to MODBUS. requests and responses are in HEX. Protocol datasheet is available on the github page.

Additional information

Weight 1 lbs
Dimensions 6 × 4 × 1 in
Include Bluetooth Module?

Yes +$8, No $0

Include USB Module?

Yes +$9, No $0

Wire Style

No Wires, -$2, Standard 10ga Wires, $0, 8ga Wires, 12" Long, +$20, 8ga Wires, 24" Long, +$32

1 review for BMS 120a 4s 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

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