What I wanna know now is some suggested configurations that max out the solar input while minimizing cost and complexity. I have a 40'x17' roof area to work with.
I run twin MPP Solar 6048's and currently have 16 CS 440W bifacials, with space for 16 more next year.
The 6048 has two solar PV inputs, each can handle up to 4000W
The 145 is a hard limit, including an allowance for cool PV panels in full sun. Where I live I need 25% to be sure I stay below the 145VDC where you live could be quite different.
To figure out the best arrangement of PV you need to also know the panel specs: VOC (volts open circuit) IMP (current at max power point) and ISC the max short circuit amperage.
As Matt noted above, you can work this out from the data on the PV panels, which we don't see posted so we can't tell you the 'best' arrangement.
I can tell you my 440W panels put out 44VDC and I can only put these in 2S (two in series) to make 88VDC since I have many cold days of full sun in January. I tried to use 3S as a test but the MPP shut it off on over-voltage.
my panels have ISC of 11.4Amps so to stay under the 4000W limit the 6048 has this would be 4P (4parallel) I put them in 2S-4P each x 2 strings and ran one to each of my two 6048 inverters. Next year when I get 16 more PV panels I will again go 2S-4P and use the other 2 PV inputs one on each 6048.
A roof area of 17 x 40 - depending on if your using 60 cell or 72 cell PV panels will be able to accomodate a different total number of panels.
my 440W panels are 41inches by 84 inches and two rows work out well in an area of about 14 x 28
If maximizing the PV wattage is important, go with higher Wattage panels, 400-500W per panel, I found that the costs of racking and cables made the higher Wattage panels a better deal, although they are quite heavy - 60 lbs each I suspect.
