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Do solar panels get weeker over time?

I have 2 solar panels on my RV which are about 4 years and 6 years old respectively, and I feel they are providing less amperage to the batteries than they did when they are new. Is this something that happens when solar panels age or is it my expectations being higher than they were when I first got the panels?

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You are correct they do lose the output over time. .Not knowing the specific type or brand of the panels the following is a general over all reply.

The manufacturer will give the specific amounts the panels will lose their efficiency. Newer panels I believe will 2-4% the first year then something like 1% per year. Newer panels usually have a life of 20 years. I am not sure about the smaller panels you have but I would guess they may be a little faster especially if your putting them up and down constaly.

Also make sure you clean them, that will make a very substantial difference especially since they are smaller in size and I am sure you know that shade on ANY PART of the panel may eliminate total sections of the panel producing power, depending on the type of [panels you have. Also check for scratches where you might be able to light through the panels as that may affect the output.

I would suggest a google search for manufacturer and model # and then review the spec sheets for the item. That is were you would find the information.If you don't and the company is still in business send them an email and they will let you know.

Good luck.

Posted on Oct 31, 2012

  • Mark Prior Nov 03, 2012

    Thanks for your responce. This helps put things in a little better prospective. Thanks

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