What happens to the MPPT between 425V and 500V ?
Hi all
I currently have 9x 490W panels in series on one of my 5kW units (nothing connected to the 2nd MPPT). The max. voltage that I have seen at the inverter is 389V, despite the cold weather that we have been having the last couple of days here in CPT.
I am wondering if I cannot add another panel to my string? Taking the max. voltage that the inverter has recorded and scaling that up to 10 panels, I would be sitting just shy of 435V. This would still be well below the 500V max. voltage limit of the MPPT - but above the 425V operating range.
My question is what exactly happens if I exceed the 425V (but stay within the 500V limit)? Does the MPPT derate and produce less output? Or does it simply 'ignore' the additional voltage?
Are there any risks to my thinking?
Thank and regards
Andy
@andy.wolf , with 10 panels my Voc would be 468 volts, with our cape Town weather last week, with 9 panels, i saw 411 volts.
so i have decided NOT to take a chance for an extra 300 watts and now have sold the extra panel that i had laying around, albeit at a loss.