write_multiple_registers: negative values

[Wizwalli]

Writing Negative Values with write_multiple_registers in Modbus INT16 for SOFAR HYD 20K 3PH

Hi everyone,

I’ve been using this repo to write positive values to my SOFAR HYD 20K 3PH inverter, which allows me to charge my battery on demand, utilizing either grid power or solar production, depending on availability. However, I’ve hit a roadblock when trying to discharge my battery.

The issue seems to stem from the way Modbus handles values, specifically the INT16 format, as described in this GitHub issue. My understanding is that INT16 limits the register values to represent signed integers, which makes writing negative values a challenge.

I’m curious if anyone else in the community has encountered this problem. If so, have you managed to find a workaround for writing negative values via write_multiple_registers? Any insights, solutions, or even just confirmation that this is a shared issue would be greatly appreciated!

Looking forward to hearing your thoughts.