Hamfast wrote: »
Here are the numbers from the link provided here...http://rredc.nrel.gov/solar/old_data/nsrdb/1961-1990/redbook/sum2/state.html
At a fixed 45deg angle, averaging the 12 month irradiance numbers (4.81) then dividing 4733WH by 4.81 yields an array of 984W.
An average of the lowest 6 months (much better I'm thinking) yields an array of 1364W.
10% battery bank (370Ah) - 37x48V=1776W x .77 derating yields an array of 1368W.
Wow! Pretty wild how those last 2 calcs work out. I don't think that's an accident. I'd feel very good about the 1440W array as I've proposed if not for Eric's observation regarding charging amps. Four strings of these panels provides ~20.5 amps to the CC.
Do MPPT controlers compensate for under-amperage from the array?
Off Grid System; 2175W array; 370ah @ 48v (8 L16 Scrubbers in series); XW MPPT60-150 CC; OutBack VFX3648, FlexNet and Mate
You did the derating backwards. If you want 37 Amps on a 48 Volt battery it's 1776 Watts before the derating loss, so that's 1776 / 0.77 = 2306 Watt array.