How Does YamBMS Merge Multiple ESS BMS Units for One Inverter Over W5500 Ethernet?
YamBMS is an ESPHome project that merges parallel BMS units into one battery for the inverter. Its two ESP32-S3 Ethernet board files both configure a W5500.
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Components
Hardware components
WIZnet - W5500
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Ethernet controller configured in two of the project's ESP32-S3 board packages. board_ESP32-S3_WS-ETH.yaml sets type W5500 with mosi 11 / miso 12 / clk 13 / cs 14 / reset 9 / interrupt 10 at 25MHz, an
Project description
One Battery Wall, Several BMS, One Inverter Port A hybrid solar inverter with a battery communication port expects to talk to one battery. A home energy storage system built from separate packs is several batteries, each with its own BMS, wired in parallel. YamBMS is the layer in between. It is an ESPHome configuration set published by GitHub user Sleeper85 in August 2024 under GPL-3.0, described by its author as "Yet another multi-BMS Merging Solution". ESPHome is the YAML driven firmware builder behind much of the Home Assistant hardware ecosystem: you describe a device in a config file…
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