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Hi,

I'm Sleeper85 — the developer and maintainer of YamBMS.

It started as a fix for my own solar setup: I wanted several JK-BMS units to appear as one battery to my inverter.

YamBMS is free and open-source firmware (ESPHome, GPLv3) that aggregates one or more JK BMS units into a single battery your inverter can talk to over CAN/RS485 — Pylontech and other protocols.

It runs on 250+ live systems worldwide. It will stay free, forever: no paid features, no supporter-only functions, no locked code.

GitHub issues and the DIY Solar Forum thread are where I answer questions about YamBMS, and where bugs get reported and fixed.

If YamBMS saved you time or money, a coffee is a nice way to say thanks. It doesn't buy anything — the project stays exactly the same either way.