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Infinisolar 10kW (PI17) battery calibration


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Recently I replaced my old pb batteries with LiFePo4. During comissioning I noticed a 0,3V voltage gap between my infini 10k's reading and the BMS.
Measurement with a calibrated multimeter proofed that the inverter's reading is wrong.
I know how to calibrate the battery voltage on the small infini's with PI16: Start/end calibration mode with "OEEPB" and use "BATV+01/BATV-01" for change.

Disassambling the 10k firmware shows that BATV command seems to be implemented (must be e.g. ^P008BTVA+01 when sent to inv), but all my tests get "^0" as a reply (=>not implemented).
I'm afraid I have to put the inverter into a "battery calibration mode" as well, but I don't know the command for that?

Any ideas?

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