Amp Hours From Solar Panel

At the end of this typical six hour solar day the panel will have generated 30 amp hours 5 amps x 6 hours 30 amps hours.

Amp hours from solar panel.

So the available 100 amp hours from the battery divided by 0 69 equals 145 hours. Battery capacity in watt hours x 2 rated panel power in watts example. First you will have to determine the ampere per hour rating of the solar panel by dividing its power generation rating given in watts by the voltage of the battery. To clarify some of the mystique involving watts amps and amp hours let s begin with a 100 watt solar panel that produces 5 amps during peak sun hours a solar day.

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. 5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh. To get that kilowatt hour back in your batteries your panels have to put in 100 amp hours from the sun before it sets. Then take the battery capacity which measured in ah and divide it by the amp rating the result from prior computation of the solar panel and then adding 10 of the charging time to it.

10 watt 18 volt solar panel charging a 12v 10 amp hour lead acid battery 120 wh from 50 full to full time 60wh x 2 10 watts 12 hours. In the real world never drag your batteries below 50 charge. 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. For an analogy let s use some familiar automotive terms.

In a perfect world that you use 1 kwh per day.