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Old 07-25-2017, 02:01 PM   #1
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4x255ah batteries

What size is your battey bank. What can you run and how long. How many solar panels do you use to charge them
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Old 07-25-2017, 02:34 PM   #2
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Location: Orange County, CA
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Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
I will have eight golfcart batteries in two separate banks of four in series and parallel, giving me about 900 amp/hours at 12V. To charge them I have eight Sharp 255W panels totaling 2040 watts that power two Morningstar TS-MPPT-60 charge controllers. My intention is very simple - my solar will be enough for all my needs, including a 12K minisplit and heatpump in the front and a 5 or 6K window A/C in the bedroom, and I will have three days' autonomy if the sun doesn't shine for that long (but that's very unusual here). Along with that, I have 220 gallons of fresh water and 180 gallons of black and gray tanks, so I should be self-sufficient for at least a month off-grid by myself, or two weeks for my GF and I (he says optimistically!).

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Old 07-25-2017, 04:57 PM   #3
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Join Date: Apr 2013
Location: Colorado
Posts: 1,675
Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
Rated Cap: 2
4- 12V x 100AH batteries

400 AH - 50% depth of discahrge = 200 AH
charging by generator its impossible to top off the batteries. i shoot for a bit over 80%. that puts my bank around 160 usable AH. that's probably just over the daily use of my fridge. when camping, they need charged daily. i have no solar. the batteries charge on generator only. i like to run 1-2 hours of generator time per day. more is better!
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