How Much Sunlight is Available Where You Live?

This solar sunlight availability chart shows the average hours of DNI (Direct Normal Irradiance). Of course diffuse, reflected and refracted light as well as "high angle of incidence" radiation can still be collected. To estimate the net daily production of a stationary solar panel facing south and elevated to an angle to match the latitude, a good rule of thumb is to simply multiply the peak watts (as stated on the solar panels UL Listing) by the above DNI values for your area. This calculation will provide a conservative estimate of the average net daily production of a solar panel. Indirect insolation and high angle insolation (early morning and late afternoon) is disregarded in this simple calculation so as to offset average power losses due to wiring resistance, battery or inverter loss etc. As an example, a 225 watt solar panel in Baltimore MD could be expected to produce approximately 1kWh (one kilowatt hour or 1000 watt hours) of net average power per day, (225 x 4.5= 1012.5).

For exact solar irradiance (solar DNI, solar insolation) information, check out this zip code based solar energy calculator

Courtesy of Solar Panels Plus.Com

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The Angle of Your Panels????

We all know that when installing our solar panels it's important to have them at the proper angle to take advantage of the best possible direct average sunlight that we get throughout the year. Here is a link where you can to find what your latitude is. When you've located your city using the zoom controls, click on it to find what your latitude, and from there it is quite simple. The latitude is equal to the best angle for your solar panels to be set at. What a coincidence.

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