I have MPPSolar PCM5048 MPPT which is connected between the solar panels and the batteries. It was working well until yesterday as a sudden it reads negative amps on the battery current. it keeps changing values between (-0.5 to -4 amps at 8 am. while this read should be the same but positive).
Note: I get the negative read on the Battery Current display
MPPT IN and OUT reads:
note: these reads at 8 am while the inverter is off. "no loads on the battery bank"
voltage input: between 90 - 100v
Voltage output: between 24 - 27v
Amps input: between 1 - 3 amps "positive" (depending on day time and battery State of charge percentage).
Amps output: between 3 - 5 amps "positive" (again depends on battery SOC and load).
Things I did.
1- I switched off the power inverter to make sure there is no load on the batteries. the result was getting a read between (-6 and -10 amps).
2- I switched off the breaker between the MPPT and the batteries. The result was getting a read between (-18 and -22 amps).
3- I unplugged the batteries and turned off the breaker between the panels and the MPPT and let them for 6 hours. the result was the batteries voltage was 13.1v each. (the batteries are in a good condition)
4- I re-plugged the batteries and switched on the breaker and the problem still the same.
What could cause this issue?
Is it possible that the mppt gets a faulty read? what to do if it does get a faulty read?
Anyway to reset the MPPT other than unplugging it?
Could something else other than the MPPT cause this problem?