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RVing message boards => Tech Talk => Solar => Topic started by: Frank B on June 30, 2017, 04:55:57 PM

Title: Solar panel loss with angle?
Post by: Frank B on June 30, 2017, 04:55:57 PM
I'm trying to get a ballpark figure for the loss that I can expect with a horizontally mounted solar array on the roof of my trailer. There is lots of information on the optimum angle, but I haven't found anything on what I can expect for a loss at less than Optimum angle.


In my case, I'm looking for two figures. What would be the percentage loss at about 52 or 53 degrees of latitude in the summer? The other one, would be the loss that I could expect in the winter at about 33 degrees latitude?


Has anyone found any sort of solar calculator that will provide these kinds of figures?


The thing is. I am not going to tilt my panels at all. I'm just trying to calculate what I can expect for power with a flat panel at those latitudes in those seasons.


Thanks.


Frank.
Title: Re: Solar panel loss with angle?
Post by: Sun2Retire on June 30, 2017, 11:17:30 PM
Has anyone found any sort of solar calculator that will provide these kinds of figures?


See if this works for you:


http://pvwatts.nrel.gov (http://pvwatts.nrel.gov)


Used it when running calculations prior to the solar installation on our house. Pretty sure it includes a tilt variable along with latitude
Title: Re: Solar panel loss with angle?
Post by: Gary RV_Wizard on July 01, 2017, 10:03:07 AM
With RV solar, the optimum mounting angle is usually irrelevant because the RV is typically positioned differently at every site, altering the actual angle the sunlight hits it (or not). Even adjustable (motorized) mounts don't help a bunch (the whole panel may be oriented wrong).

And as you probably know, the optimum angle varies by latitude and season as well.