Calculate Energy Production Solar Panels

Here s a simple formula for calculating your solar panel s power output.

Calculate energy production solar panels.

The global formula to estimate the electricity generated in output of a photovoltaic system is. Solar panel watts x average hours of sunlight x 75 daily watt hours. Solar power as a function of time in kwh or wh that your solar panel can produce taking into account its rated power and solar energy available at your place. Given 1kw of panels produces 1642 kwh per year in ca and 1kw of panels takes up 68 42 square feet solar panels installed in california on average produce 23 99 kwh kilowatt hours per square foot per year.

It allows homeowners small building owners installers and manufacturers to easily develop estimates of the performance of potential pv installations. How much energy does a solar panel produce. 6 02 kw ac 8 7 53 kw dc. The azimuth or orientation of the solar panel system whether it be on your roof or ground mounted.

The stc measure the solar panel s energy output using common conditions of light exposure orientation and panel temperature. What s that 75 percent for. To calculate the solar electricity that needs to be generated you need to know the amount of energy that can be stored in the solar pv system s rechargeable battery. 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.

The solar panels selected should be sufficient to recharge the battery. If you experience a good amount of shade on your roof. The key is to match the recharging energy requirement to the solar panel and the charge controller dc output. How to calculate a solar production estimate shade.

Number of panels dc rating panel rating e g. The basic measure of solar panel energy output is calculated by testing the panels under average conditions known as standard test conditions stc. Nrel s pvwatts calculator estimates the energy production and cost of energy of grid connected photovoltaic pv energy systems throughout the world. E energy kwh a total solar panel area m2 r solar panel yield or efficiency h annual average solar radiation on tilted panels shadings not included.

How to calculate solar panel output. 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. You can use the table of solar power production per kw for each state above to do the same math for your state. So a 7 53 kw system 7530 watts and a 250 watt panel 250 kw.

Shade can dramatically affect production of your system. 5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh.