Calculate Watt Hours Solar Panel

To figure out how many kilowatt hours kwh your solar panel system puts out per year you need to multiply the size of your system in kw dc times the 8 derate factor times the number of hours of sun.

Calculate watt hours solar panel.

Amp watt hour calculator system design tool. As an example let s say you have 250 watt solar panels and live in a place where you get 5 hours of sunlight per day. However you may notice that mostly during the summer seasons you may normally get around 10 hours of reasonable amount of sunshine but the winter season may produce roughly around 4 5 hours of effective sunshine. The ultimate off grid solar watt hour calculator figure out how much solar you need.

1 000 watts x 10 hours per day 10 kwh per day check out our off grid load evaluation calculator. That s to account for all those variables we ve been going over. This amp watt hour calculator is provided to help you understand some basic electrical terms calculations. Calculate the current in amps by dividing power in watts by the voltage in volts.

It can give you an estimate of your total power usage in either amp hours or watt hours. If you want to get an estimate of the number of solar panels required you need to leave the volts at 12. The first step in figuring out how many solar panels you need and what size of off grid solar power system will work for you is to know how much energy you use on a daily basis. You must simply divide the average daily kwh by the peak sun hours assuming a 30 day month an electricity generation of 1 000 kwh is equivalent to 33 33 kwh per day.

The first step is calculating the kilowatts needed. 250 watts x 5 hours x 75 937 5 daily watt 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. For example if the solar panel is rated at 175 watts and the maximum power voltage vmp is given as 23 6 volts.

What s that 75 percent for. So if you have a 7 5 kw dc system working an average of 5 hours per day 365 days a year it ll result in 10 950 kwh in a year. 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. 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.

Once you know the peak sun hours estimating the number of solar panels needed for 1 000 kwh is simple. After estimating daily usage we need to consider which type of battery will work best as they have unique performance characteristics and are sized differently. 6 watt solar panel charging a 4 000mah 3 7v battery time 14 8wh 6 watts x 2 4 9 hours.