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2S2P, mixing panel sizes

WhiteHot

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Joined
Apr 9, 2021
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Due to space limitations on my RV, I want to run:
  • 2x Newpowa 180W panels connected in series
  • 2x Newpowa 210W panels connected in series

Both of those strings would be connected in parallel (so 2S2P) to a Victron 100/50 MPPT. I will be slightly over-paneled at peak output.

I could just go with 4x 180W panels but I would like the extra output if there aren't any downsides. All of the panels are mounted in the same plane and there will be no shadowing due to the RV (though there could be due to trees, etc.)

My thoughts:
  • 2S2P might be good to deal with any shading caused by things around my RV
  • Any losses in the wiring by going with a higher voltage 4S 180W arrangement will be more than made up for with the extra 60W of solar

Thoughts? Should I be good to go with the above arrangement? Seems like it since the voltages and cell arrangements among the panels match each other.

Tech info for 210W panels:
Maximum power (Pmax)210W
Voltage at Pmax (Vmp)16.77V
Current at Pmax (Imp)12.48A
Open-circuit voltage (Voc)19.83V
Short-circuit current (Isc)13.09A

Tech info for 180W panels:
Maximum power (Pmax)180W
Voltage at Pmax (Vmp)16.77V
Current at Pmax (Imp)11.20A
Open-circuit voltage (Voc)19.84V
Short-circuit current (Isc)11.75A
 
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