User Manual: Download Manual (6.5mb PDF)

Now updated for the 16s BMS!

iPhone App: xiaoxiang-bms

Android App: version 3.1.1026

(allow 3rd party app to install)

New Desktop App with password reset tool:

Overkill-Solar-bms-tools for Windows

(Download latest release package, unzip and run)

(JBD Chinese version) Desktop App:

JBDTools V2.9-20210524

(unzip and run)

Communication Protocol Documentation

Backup files:

Arduino library: Version 2 (read/write)

Detailed Instructions, 8 cell 24v battery with BMS. PDF

4 cell 12v Wiring Diagram & settings PDF

8 cell 24v Wiring Diagram & settings PDF

16 cell 48v Wiring diagram & settings PDF



DIY Solar Power with Will Prowse (youtube channel)

About Cell Balancing

Overkill Videos:

YES, these are all terrible. I’m not “a youtuber”. One thing at a time.

Read BMS parameters on an iPhone

Do bigger wires make a difference?

A tool to solder 8ga BMS wires

Tech Support, etc:

For troubleshooting help , please include a screenshot and clear photos of your battery. 9 out of 10 problems are an incorrect setting or an incorrect connection.