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, see our zip-code
based solar energy calculator.
For more information, pricing or to order solar panels, inverters,
charge controllers or other solar panel accessories, please
contact us.
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