If you have two 100ah batteries wired in parallel you have 200ah capacity.
How much from solar panel to battery.
Assuming we get 5 hours of direct sunlight we know a 100 watt solar panel will produce 30 amp hours per day.
Before you can determine if installing a solar battery makes sense you ll need to know the price.
This means that on that scenario the solar panel delivered 60 watts of power to charge the battery.
Like solar you can think of the costs as both a gross price and a price per relative capacity.
So if you have a solar panel that with a 10 watts power rating and it is exposed to sunlight for at least 6 hours.
So to recharge them from 50 would take 17 hours with a 100w panel.
We perform better than this on our own panels and battery combinations on clear sky days but this is a more realistic estimate for less than perfect days.
You can get the amount of energy it will provide the battery by multiplying 10 watts by 6 hours which will give you 60 wh.
As we talked about above a 12v 100ah battery is 1200wh 12 100.
Panel power in watts battery capacity in watt hours x 2.
6 watt solar panel charging a 4 000mah 3 7v battery time 14 8wh 6 watts x 2 4 9 hours.
Solar batteries range from 5 000 to 7 000 and from 400 dollars per kilowatt hour kwh to 750 kwh.