MPPT reset increases amps on PV2
I have an 8kw inverter with 2 MPPTs and 14 solar panels split into 3 strings. The solar panels are arranged as follows: 6 x 545w Canadian facing NW, 4 x 545w Canadian facing SW and 4 x 550w JA facing NE. PV2 consists of 5 x 545w Canadian NW and PV1 consists of the rest. During the day at 12:00 , just charging the batteries, PV1 would be at +/- 380 V and 6.9A and PV2 would be at 220V and 6.2A generating 2600w and 1350 w respectively. Once the geyser starts and the load exceeds 4kw the total wattage does not change until I turn PV2 off and on after which PV2 shows 180V and 11.0 A and generates 2000 w. PV1 remains the same. I can replicate this every day. Is this a faulty MPPT or does the inverter influence the amperage or do I need to balance the panels between PV1 and PV2 ?
6 x 545 NW
4 x 545 SW
4 x 550 NE
Voc -> 49.4V
Vmp -> 41.5V
Imp -> 13.14
PV1 -> 9 x 545W 444.6Voc 373.5Vmp
PV2 -> 5 x 545W 247.5Voc 207.5Vmp
Max power
PV1 -> 207.5 * 13.14 = 2,726.55W
PV2 -> 273.5 * 13.14 = 4,907.79W
You report the system is producing the following
PV1 -> 380V and 6.9A and 2600W (380V * 6.9A = 2622W)
PV2 -> 220V and 6.2A and 1380W (220V * 6.2A = 1364W)
This is appox 50% of the possible capacity/output.
This just comes down to the panel angles/inclinations andwhere you are in the world. The string voltages would suggest that it is not a shading issue.
The balance isnot an issue.
When you say "Once the geyser starts and the load exceeds 4kw the total wattage does not change", what do you mean by "total wattage"?
Also how have you connected the load to the inverter, which ports are you using on the inverter?
Do you have battery conneted?