caravan solar panel
how long would it take to charge 6, 12v car batteries in a series with an 80watt solar panel at full output?
I’m setting up a series of batteries to run my caravans lights , charge my laptop, radio, fridge and digital tv box and monitor
first of all, six 12volt batteries in series is 72volts nominal. i doubt that you have a 72v system so you are likely connecting 6 batteries in parallel for a 12v system. this is not recommended, but is what i assume you are up to.
next, using car batteries instead of deep cycle batteries will also compromise your system.
leaving the aforementioned two points aside, to answer your direct question, we still would need to know the amp hour capacity of the batteries.
so, to do the math, we have to make the assumption that your batteries are group 27s and about 90ah each, then you would have 540ah of storage. 540amp hours at 12v is 6480 watt hours.
at 80w, your module in ideal conditions would likely do around 400 watt hours per day.
6480 watt hours / 400 watt hours per day = 16 perfect days to charge that battery bank from completely discharged assuming no inefficiencies, and also including the assumptions from above. this would be 8 days of ideal charging from half discharged.
it is important to understand that these charging times in days also assume zero load during that period.
if you are serious about doing a system, do a serious loads list, and do a little research on batteries and off grid systems. good luck, hope this helped.
james
altestore.com staff
Geaux Gypsy Caravan!
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