if MP2 is in zero export and my AC pv in input side has more than my required power let say 2000 watts AC from inverter and im using 1500 watts on my appliances, The excess 500 watts will be convert by MP2 to charge my battery? about 9-10 amps?(battery not in full charge) is the charging current be variable depending on the excess power generated by the GT inverter zero export.