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rastert111

Axpert VM 3kva Voc at102 V

Question

Hello,

I have read around forum that getting closing to max open circuit incurs derated output. My question is how bad the derating will be when connecting two panels in series. 45.6 x2 =91.2V as my inverter has max open circuit voltage of 102V. 

ofcourse Voc will decrease at higher temps, so my question is how bad the derating can be?

Currently I have 2x 335  watt panels in parallel , i plan to add 2 more in 2S2P 325 Watt panels.  My inverter is inverex 3.2 Kw, it can support upto 15oo watt PV.

Thanks

 

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6 hours ago, rastert111 said:

45.6 x2 =91.2V as my inverter has max open circuit voltage of 102V. 

I don't know this model, but scaling down from 145 V to 102 V suggests a linear ramp from 92 V to 102 V. So that's close but no problem at 25°C. Usually panels are about 7% higher in voltage at 0°C, so you probably won't blow up the Solar Charge Controller. In winter, it will take a little longer before you get maximum PV power. Unfortunately, winter is usually when you have least PV energy to waste.

So with this vigorous hand wave, I'd say you'll be OK.

Edited by Coulomb

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