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Post by satman49 on Apr 22, 2017 22:08:17 GMT
ok here goes. I have a very strange problem .I purchased 4 100 watt solar panels about a month apart.I didn't really get serious with them unti about 2 weeks ago I connected them in series and got about 83 VOC and about 5 ISC which is about right from what I read.Oh I am using a 30A MPPT CC. I have not been able to get more than 200 watts out this configuration. So as a test I connected the 2 newer panels in series and got about 150 watts with just those two. I have been going round and round with the manufacturer for two weeks. They said do this test do that test. I even sent them pictures of the reading at their request. Now I decided to buy 2 more 100 watt panels and put them in series with the 2 newer ones.With this configuration I was able to get 350-360 watts. It's only logical to me that the 2 older panels are creating my problem,even tho the VOC and ISC are in specs. I even tested the 2 older panels separately and only got about 30 watts each on a bright solar day.The others about 80 watts each.Has anybody else seen this problem with panels they had?
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Post by tytower on May 15, 2017 21:06:02 GMT
Solar panels gradually lose the ability to produce power . 80% after 5 years is common but you might have a couple of very early manufactured panels . put them to one side and use them for lights or charging batteries separately and use the new ones.
I bought some used just recently , don't know when they were made yet , but 6 250W panels in good sunlight are only producing 800 watts or so . Have to investigate each but I suspect at least one is shot . That's half of what they should put out in peak sunlight.
In comparison i have 12 new 250 watt panels up producing 2800 watts regularly atm.
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