Hi there looking at using a solar with controller and battery just for 12v devices.
How many amp hours is a 6v solar panel.
We are in the process of specifying a solar system for our ranch.
I know how to hook this up but just wondered what wattage solar panel your would recomend and what amp hour battery.
5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh.
Then add 10 of the charging time.
Then divide the battery capacity which is 50 ah by the ampere per hour rating of the solar panel which is 1 25 amps which will be the charging time.
Charging time 50 ah 1 25 amps 10 of ct.
Thus the output for each solar panel in your array would.
For the sake of example if you are getting 5 hours of direct sunlight per day in a sunny state like california you can calculate your solar panel output this way.
Battery capacity is specified either in kilowatt hours or amp hours.
For example if the solar panel is rated at 175 watts and the maximum power voltage vmp is given as 23 6 volts then calculate the current as 175 watts divided by 23 6 volts which is equal to 7.
If we assume 6 usable hours of sunlight per day that s 32 58 amp hours per day which is pretty close to our ballpark figure of 30 amp hours per day.
50 is 50 of our 100ah battery and 6 is how many amps the 100w solar panel is generating.
The panel estimation seems very accurate.
From here we can determine that two of these 100 watt panels would give us about 65 16 amp hours a day which covers our requirement of 50 amp hours.
To charge a phone a couple of times 3 led lighting at 9watts each and a mini 12v fridge upto 15tr thanks alot.
Again assuming a fully depleted battery you would need 20 amps average charging current 100 ah 5 hours.
Very timely thank you.
For example we consume about 1500 kwh per month which averages out to about 50 kwh per day or 50 000 watt hours per day.
So if you have a 100ah rv battery you can charge 50 of it in a little over 8 hours 50ah 6a 8 33.
Now on the voltage of the panel you need a panel capable of up to 14 5 volts to fully charge the battery even when it starts charging at.
For example 24 kwh 500 amp hours at 48 volts 500 ah x 48v 24 kwh it s usually a good idea to round up to help cover inverter inefficiencies voltage drop and other losses.
A 100w solar panel like the renogy 100w i own two of these generates about 6 amps per hour 50 70 watts during the peak sun hours of the day.