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byd_battery's Introduction

BYD battery

Reverse engineering a 11kWh BYD HVM battery system, connected to a Fronius Gen24 Symo 5.0 Hybrid inverter

Blockshema

Open .odg with e.g LibreOffice Draw

Logfiles

Open with HHD Device Monitoring Studio https://www.hhdsoftware.com/device-monitoring-studio

Modbus RTU Registers

Open .ods file with your favourite spreadsheet tool (e.g. LibreOffice Calc) The Battery has registers that the Fronius Inverter requests to read. There is also a write event that periodically appears (see logs) During startup more bus activity is present compared to sitting idle. This is most likely due to pre-charge handshake.

Pictures

Internal pictures from when BYD box was opened

byd_be_connect

Windows program for connecting to BYD battery and doing firmware update and diagnostics over WIFI

Manuals

Usefull manuals from BYD webpage.

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