How to measure how much solar we need?
(hope this is right section) Brought home TT last month and now have basics taken care of and RV is road ready. Now starting to think about bigger long term projects. One project is, we would like...
Forum Discussion
JiminDenver wrote:MrWizard wrote:
Never have I read about an RV`r saying they got 600 amp hrs in a day
I think you have a typo confusing watt hrs and amp hrs
600 amp Hrs would be way over 7000 watt Hrs...approx 8000 watt Hrs
I looked, a amp hour is the same now as it was 35 years ago. use one ampere for one hour and it is one amp hour. 50a for one hour is 50 Ah. 50a for 12 hours is 600 Ah.
I designed our system to be able to run a small air conditioner without draining the battery. I'm looking into options for the power that isn't being used.
Your math is correct..But amp hrs and watt hrs are different...remember Watt Hrs is Amps * voltage... 50a*13.8v = 690 watts * 12 hrs = 8280 watt Hrs
600 watt Hrs is fairly easy to achieve...today my system produced 63.07 amp hrs. Aka 883.9 watt hrs
But I said I never "READ" any RV owner user saying their system produced that (600 amp hrs) per day
We had one member off grid in Texas with his TT roof completely covered...a/C moved too basement
And he had diesel genset on auto start..when his a/C kicked on
And to make use of 600 ahr daily charge you need a very large battery bank
You will not get 50ahr for 12hrs
To avg that with flat panels you will need about 2000 watts of solar panels
