I have a Victron 150/70 controller, 4 - 200 watt panels, 2-Battle Born Batteries, Xantrex XC2000 inverter and BMV 712 Battery Monitor. My issue is that when the batteries are being charged from solar it fluctuates between 0 Watts and 400 - 500 in bulk mode. When I place a load on the system I do not get a substantial increase. It continues to fluctuate. Occasionally it gives a fault code #38. The amperage is set to 30A from the 70A max based on a recommendation from Victron. Any ideas?