A backwards solar power question
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A backwards solar power question

This is a discussion on A backwards solar power question within the General Talk forums, part of the General Discussion category; Over the last few years I have built a solar power system in a hodge-podge manor. I have quality components but the whole system was ...

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  1. #1
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    A backwards solar power question

    Over the last few years I have built a solar power system in a hodge-podge manor. I have quality components but the whole system was not put together with a good plan. Now my batteries are giving out, so before I make a serious investment in new batteries, maybe I should get a little quality advice.

    I have 1000 watts in panels and I live in south central PA. Obviously I have never seen this array produce the full 1000 watts. But I’m wondering what would be a reasonable expectation as to the average daily output I could expect from the panels?

    I currently have 615 amp-hrs in battery capacity and I have an Outback 80 amp charge controller that I can program to limit the charging rate as necessary. All info I find on line tells me how to calculate battery capacity based on load requirements. I want to work this problem backwards. How much battery capacity should I purchase (considering my existing 1000 watts of panels) to keep my batts in good shape.

    So I guess the short version of this question is.......... is there an established ratio of solar panel capacity to battery capacity?

  2. #2
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    In full sunlight, with the panels truly 'square' to the sun, 1000w of rated panels should produce 600-800 watts easily. At that level, you're approaching the limit of your controller.
    I gotta tell you.... that sounds like a terrible idea. When do we start?
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  3. #3
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    I think I may have maybe found an answer to my question after spending an hour or 2 on the computer. Based on my trying to decode info from several sites, it seems that about 500 amp-hrs of battery capacity should be my sweet spot. Feel free to chime in. Perhaps you can post your panel capacity and battery capacity so that I can get a sense of this ratio in other systems you guys have.

 

 

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