Amp Hours From Solar Panel

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.

Amp hours from solar panel.

As you can see understanding the relationship between battery amp hours and the device or devices that you wish to power helps you determine how long to expect them to run. 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. In the real world never drag your batteries below 50 charge. For an analogy let s use some familiar automotive terms.

Battery capacity in watt hours x 2 rated panel power in watts example. In a perfect world that you use 1 kwh per day. 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. One 100 watt solar panel in 10 hours of strong sunlight every day into your battery and you are self sufficient.

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. 5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh. So the available 100 amp hours from the battery divided by 0 69 equals 145 hours. 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.

To get that kilowatt hour back in your batteries your panels have to put in 100 amp hours from the sun before it sets.