Small system questions
I’m trying to determine how long it will take for two 100W panels to recharge a battery bank. The bank consists of two 55 AH 12V AGM batteries = 110 AH.
If I de-rate the panels then 200 W x 0.8 = 160 W.
Assume 4 hours of full sun per day: 160 W x 4 hours = 640 WH.
640 WH / 12v = 53.3 AH.
110 AH bank discharged 25% (trying to be conservative) = 27.5 AH used.
If the bank likes a 1/10th charge rate, then 110 x 0.1 = 11A. The two panels have a 5.75 A ISC x 2 x 0.8 = 9.2 A. Would this be a good rate of charge?
If the MPPT charge controller needs to bulk charge, absorb charge, and float charge, how long does all of that take?
If the bank needs 27.5 AH replaced and the panels produce 53.3 AH in the day, is that one afternoon of good sun enough time for the charge controller to complete the 3 phases of charging?
Thank you for helping me to understand this.