I have activated my MPP LV 6548 Solar system . Everything runs great until off grid charging is called for. After 15 or so minutes the off grid circuit that has been called upon to charge the battery trips . I have tried 2 different circuits and the same thing happens...Breaker trips. The cable I am using from Inverter to the off grid plug is 10/3 is that to light of Cable? Could that be the problem ? 15 Amp Breaker on the circuit.