Just to keep it simple. Over the years with two of us and all our toys, laptops running till midnight and furnace till morning. We currently have 210 AH of AGM and 240 watts solar which gets me by for half of the needs I have. To do it right, we need a minimum of 300 AH AGM and 400 watts solar, I also connected 4AWG wire via a constant duty solenoid for no voltage drop, from the alternator to the TC batteries. I also have an AGM vehicle battery so all batteries have similar load, charge characteristics. We do not have a generator. The solar and truck engine alternator handle the charging nicely.