DCM9040 battery monitor

[Barry Fields]

I do appreciate the offer but I have no practical experience with communication protocols. I am an 74 year old analog hardwire kinda guy. My solar system presently has NO wifi/RS485 or any other digital interfaces. For me to come up to speed on that stuff,however much I would like to expand my knowledge, it would probably be the last thing I do (literally).

I do not want my tombstone to read "Just when he started to understand modbus".

[Barry Fields]

Just installed my new DCM-120100C meter.

Externally the same as the older DCM-9040. Fits in the panel hole just fine. External 100a 75mv shunt placed in the low side PV total to charge controller.

The new calibration procedure is much more straight forward if ya carefully read the instructions provided.

Seems to be performing well for monitoring PV power delivered by the panels to the charge controller.

I have no use for the AH or SOC readings so can make statement concerning them.

[Hockey]

Thanks Larry,
I needed a meter that could stay in my living room with the shunt mounted 10 ft away in the outside battery enclosure.

I opened up my a 100A PZEM-25 looking for an undocumented UART (didn't find one ).   But to your need, I found the sense wires come from the board and are soldered to the shunt.   You could extend the sense wires as needed.  Not sure what that will do to calibration.   May need to change the shunt resistor or live with some inaccuracy.