I'm trying to track down a behavior where the DC power consumption shoots up when a large load is placed on the inverter. In this case, the load is a 15,000 BTU RV air conditioner. It's wreaking havoc with the math:
The MPII is showing 12.83 volts and consumption of 140.7 amps of current. 12.83*140.7 = 1,805.2 watts. But, as you can see in the screenshot. The Multiplus is reporting 1,542 watts. That happens to be exactly the wattage of the AC load, but seems to ignore efficiency overhead (which is larger than I would have expected, but...). As a result, the mismatch seems to be being lumped into DC Power. That makes sense since we know that's a calculated value of the "leftover" power. As a result, DC power is being over reported by 250-300 watts when there's a large load on the inverter.
An additional oddity, the overall math doesn't match up either. If I look at power sources, solar and battery, they total 2,163 watts. If we then look at AC loads or battery power from the MPII plus DC Power we get 1525+340 = 1,865. So, where did the other 300 watts go? I know there's a discrepancy between the inverter's watt draw reported and actual, but that should already be accounted for in the inflated DC Power number.
I'd love to figure out what's happening. I'd also love for the system not to be losing 600 watts in efficiency overhead, but that might be wishful thinking.
-Ben
