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Old 27-10-2014, 04:05   #1
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NREL.GOV DAILY SOLAR RADIATION

the map tells me that the average Daily Solar Radiation is 5 to 6 kWh/m2/day,in my area. How does that relate to my four 100w panels?
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Old 27-10-2014, 04:36   #2
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Re: NREL.GOV DAILY SOLAR RADIATION

Panels are rated based on 1kW/m2 of insolation. So each of your panels will generate 100w if exposed to 1kW/m2. VERY ROUGHLY, an average of 5-6 kWh/ms per day means in essence that your panels, if oriented to follow the sun will generate a maximum of 5-600W/hrs per day, so all 4 will generate 2-2.4kW/hrs per day. Assuming you are using a 12 volt system, that is 166-200 amp hrs per day.

With fixed panels which are not pointed directly at the sun, you will get a lot less - more likely around 100 amp hrs per day.

Edit: I see that NREL data is for "latitude tilted" panels - so the figures are for fixed panels set at an angle equal to the latitude, not moveable panels always oriented to the sun. In that case, you may get a bit more than that 100 amp hours on average if you orient and tilt your panels appropriately.
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Old 27-10-2014, 06:51   #3
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Re: NREL.GOV DAILY SOLAR RADIATION

I have two sets in series then parellel for 24v. Does that mean it would be 100 amp following the sun and 50 amp if stationary.

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Old 27-10-2014, 16:58   #4
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Re: NREL.GOV DAILY SOLAR RADIATION

Yep, if you have a 24 volt system, the amp hrs (not amps) are half of what I guestimated above. (amps = watts/volts)
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Old 28-10-2014, 04:23   #5
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Re: NREL.GOV DAILY SOLAR RADIATION

Thank you very much. That was a tremendous help.

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