Max Input Voltage on MN15-12KW-AIO

[TeslaJerk]

Hi there,

I'm new to solar and I'm confused on what Max. Input Voltage means. Is it the limit for the whole inverter or per each MPPT?

Solar Panel Specs
Voc   Vmp   Isc   Imp   Cold Voc
48.3   39.6   10.2   9.6   55.8348

I will have 9 panels facing west and 9 panels facing east. If I connect 9 panels in series on MPPT #2 I will have 502 volts with 10.2 amps. I also want to connect 9 panels in series on MMPT #3 for the other side.

The max input voltage is under the 600 volts on each MMPT controller but it's over 600 volt limit for both the MPPT controllers combined. Is it ok to use 502 volts on two MMPT controllers without damaging the inverter?

[FNG]

it is per MPPT but the arrays are isolated from each other so it is still under 600v with your multiple arrays

[jahyde]

You also need to consider cold temperature voltage rise, for a panel like that often they jump .25% or more for every degree below 25C, you must verify the panel specs what the temp is and percentage. If you are in an area of mild climate it's probably not important, but extreme cold+sun could get the VOC close to 600v.

To verify you take the coldest possible temp and you get the difference of that and the standard test temp, then multiply that times the percentage times the VOC of the series 502. If the coldest is -20C, that's 45 degrees under 25c, so 45x.25=11.25% voltage rise= 1.1125x502=558 max VOC, still safe if your specs are .25% per degree.