This is kind of Electricity 101 question from a nube, but here goes. I'm trying to replace my cement roof off grid PV array with Nine 250W panels and previously I had a distance of about 22 ft from Charge controller with 10awg wire to my old array. I get that the gauge & distance has to do with not only loss but safety/fire hazard, but my question is,... if my array is ~90V and ~25A and I use the existing 22ft of 10awg to the first PV panel, how do I factor in the probably 20-30 ft of wiring that is attached to the other panels? I haven't purchased the panels yet so I dont know what gauge it is but since we are talking amps going through the "firehose", if I replace the main run from CC to the first panel with 8awg, isnt mixing gauges in a circuit going to create a bottle neck, meaning the resistance in the thinnest wire is its weakest link? Is the loss in power to the CC the same? Can I keep the 10awg? Forgive my awkward understanding of the concepts, but help would be appreciated
Numbers: MPP 24224lv MSD inverter/MPPT controller with 145V max input. Location never under 0 Centigrade. Operating Voltage range 30~80Vdc.
Probable PV modules (9-250w) (Not sure yet if 3P3S or 3S3P is best)- Each:
Open circuit voltage (VOC): 37.6 V
Max power voltage (VMP): 30.3 V
Short circuit current (ISC): 8.85 A
Max power current: 8.27 A
Numbers: MPP 24224lv MSD inverter/MPPT controller with 145V max input. Location never under 0 Centigrade. Operating Voltage range 30~80Vdc.
Probable PV modules (9-250w) (Not sure yet if 3P3S or 3S3P is best)- Each:
Open circuit voltage (VOC): 37.6 V
Max power voltage (VMP): 30.3 V
Short circuit current (ISC): 8.85 A
Max power current: 8.27 A