Setup: MPPT 100/30 (420 watts solar), Multiplus 2000 inverter\charger, Smart BMV-712. Batteries are 600Ah AGM. All components and batteries are new. MPPT is set in position 2 for AGMs.
The BMV shunt is installed at the electrical panel (farthest from battery). The MPPT is wired to the battery side of the battery switch, and closer to the battery.
Question 1: Should the voltage measured on the solar controller be the same or close to that measured by the BMV? I am seeing a difference of .5v - 1v (MPPT is higher) when the controller is in sun. In the dark they differ by .02 volts.
Question 2: When the Inverter is on it seems like the MPPT is fluctuating and turning on\off - i.e. The wattage goes up to 200W then down to 0 in a matter of seconds. The BMV is reading 100% SOC, the current draw at 200W is negative, and the MPPT is saying Absorption. Then it almost immediately cycles down to almost zero watts, the current draw at the BMV goes positive, and the cycle repeats. Is this on\off normal? If I turn the Inverter off it seems like the MPPT stabilizes and goes into Float mode, though the voltage between the BMV and MPPT still differ. Does this sound normal as the current draw is almost nil once the Inverter is turned off?
note: I didn't see this MPPT cycling with my old inverter (Prosine 2000) that was recently replaced with the Multiplus.
