Is my math off on the size of array I need?
So I copied this formula, provided by BB, on how to determine the size of array necessary to charge your required AH.
“Size of solar array--Two calculations, first based on minimum rate of charge for battery bank. 5% for weekend/seasonal usage, 10% to 13% for full time off grid--Your system may be better off with the 10% rate of charge--Basically you are running the fridge 24x7, so you are "stealing" some charging current during the day--The 5% minimum rate of charge assumes no concurrent loads:
AH x 14.5(12V) or 29(24V) x 1/0.77(panel efficiency) x % rate of charge(5% for weekend/seasonal use, 10% to 13% for full time off grid, 10% was suggested for our situation)= Wattage of panel array”
According to the specs on my panels, they are rated at only 16% efficiency. When you plug that in to the formula using the 430AH that I will need for my loads, I get.
430 x 29 x 1/0.16 x 0.10 = 7,793.73 Watts
I already have 6 panels for a total of 1860 Watts. That comes out to a 2% rate of charge. Am I in trouble?