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Post by bupkis on Aug 2, 2019 15:44:24 GMT
jeffinseattle, for clarity let me repeat my answer to your question, series or parallel with regard to variable shading.
parallel, makes no difference in controller size or anything else.
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Post by mediadogg on Aug 2, 2019 16:23:40 GMT
jeffinseattle the problem your going to run into is your panels aren't going to be close together with the way you say you have to set them up....... Because of wire length...... Grammar and attitude notwithstanding, I agree with tattoo that one needs to be mindful of panel configuration relative to input capacity of the controller. But there is no need for arguments or hostility. The manufacturer has provided the specs. There is no need to speculate. Just adhere to the specifications.
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Post by tattoo on Aug 2, 2019 18:15:58 GMT
The manufacturer has provided the specs. There is no need to speculate. No attitude at all..... If that's what you read in my post you need to change yours.....
But responding to your above..... If that was the case we wouldn't need this forum..... Am I right? ? ? ?
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Post by tattoo on Aug 2, 2019 18:21:43 GMT
jeffinseattle, for clarity let me repeat my answer to your question, series or parallel with regard to variable shading. parallel, makes no difference in controller size or anything else. So if he had 40 panels and a 20 amp CC it wouldn't matter? ? ? I totally disagree........
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Post by tattoo on Aug 2, 2019 18:24:40 GMT
I was told there wouldn't be any test? ? ?
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Post by bupkis on Aug 2, 2019 19:38:35 GMT
jeffinseattle, once again let me be clear that shade is bad for both parallel and series connected panels, it is worse on series, period. Don't matter the size and shape of nothing. Your question was simple and its predicate don't matter. There are good & bad reasons to go with series, the same applies to parallel. But shade is a no brainier! For overpowering a controller, it don't matter if you over power it with series or parallel panels. I would suggest you go with 60 or 72 cell big A panels ('24v' panels). one for East, west and south. series connect a bunch of small panels yields high input voltage which needs transforming down to battery voltage, the higher the input voltage the less eff due to transforming epever solar no long has the manual for their 60A version. Their manuals do have eff curves at the end, a very similar controller www.epsolarpv.com/upload/file/1903/Tracer-BN-SMS-EL-V1.2.pdf
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Post by tattoo on Aug 2, 2019 20:50:43 GMT
For overpowering a controller, it don't matter if you over power it with series or parallel panels. Isn't it amazing how times have changed...... It wasn't a year or so ago you were telling people not to do that as it would burn up there CC......
I'm glad they fixed the CC from having that problem..........
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Post by mediadogg on Aug 2, 2019 21:23:02 GMT
I was told there wouldn't be any test? ? ? point well taken my friend!
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Post by bupkis on Aug 3, 2019 0:54:36 GMT
jeffinseattle, do not believe what anyone says about me, they remember WRONG. Fact is overpowering a charge controller is common practice. 1. panels rarely make rated power. 2. manuals like the one linked suggest 3X the rated input power (page 9 & 10). 3. rated power comes at ideal factory conditions like temp and exact sun angle (that don't happen often/ever for fixed poor angled panels). I've been able to read and do read manuals for a long time. Anyone that suggests power is not equal to power whether it comse from parallel or series panels is an idiot and their posts prove such over and over again. There is a loss is transforming high voltage to battery voltage. the higher the input voltage the bigger the loss. No one should use 100w panels for over 300 watts, what a waste.
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Post by tattoo on Aug 3, 2019 1:17:23 GMT
jeffinseattle, do not believe what anyone says about me, they remember WRONG. You want me to show you? ? ? I can post it if you like...... I was the one that you said it to.........
Remember when you were talking about your solar system...... and I said you just had a few lights on your walk way to your house that was solar? ? ? You also said then I remembered wrong but I found where you said it and posted it? ? ? I wasn't wrong then and I'm not this time either.......
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Post by tattoo on Aug 3, 2019 1:28:42 GMT
No one should use 100w panels for over 300 watts, what a waste. Why not? If that's all that you have room for why not use them? ? ? But I guess when you have a tiny system like you have you don't need much power.......
There are so many factors in place to the size of the panels that should be used........ The larger the panels the larger they are and the more they weigh...... When you install them yourself by yourself that's things that become a HUGE factor in what you purchase..... If not it should be........
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Post by mediadogg on Aug 3, 2019 11:29:11 GMT
My opinion is that everybody is both a little bit right and a little bit wrong. I have to admit to not worrying so much about exceeding CC power limits, because they are based on both the current limit and voltage limits being hits simultaneously, which rarely happens. On the other hand, the voltage and current limits are independently specified. So, if you hook up a bunch of low current panels in series, and their combined voltage greatly exceeds the CC voltage limit, then you are taking an undue risk, even though you might be sending in less than rated power to the CC.
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Post by tattoo on Aug 3, 2019 12:17:41 GMT
My opinion is that everybody is both a little bit right and a little bit wrong. I have to admit to not worrying so much about exceeding CC power limits, because they are based on both the current limit and voltage limits being hits simultaneously, which rarely happens. On the other hand, the voltage and current limits are independently specified. So, if you hook up a bunch of low current panels in series, and their combined voltage greatly exceeds the CC voltage limit, then you are taking an undue risk, even though you might be sending in less than rated power to the CC. At this point I'm believing it as you do.... On the better larger CC I don't think you can burn them up.. Well within reason....... But on the smaller non MPPT CC I believe you can over power them very easily......
But when I first started in solar everything that I read and heard was not to over power a CC...... That was even Renogy policy and I think it still is? ? ?
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Post by mediadogg on Aug 3, 2019 13:54:38 GMT
Deleted post.
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Post by mediadogg on Aug 3, 2019 14:02:01 GMT
At this point I'm believing it as you do.... On the better larger CC I don't think you can burn them up.. Well within reason....... But on the smaller non MPPT CC I believe you can over power them very easily......
But when I first started in solar everything that I read and heard was not to over power a CC...... That was even Renogy policy and I think it still is? ? ?
I'm sure they would say yes, since by definition to "overpower" would void the warranty. My point was that you can violate the voltage or current limits even while not violating the power specs. That's why you never plugin panels to the cc without a battery. Series connected panels under no load are giving you open circuit voltages X number of panels, which could exceed the voltage limits even if you never experience enough sun to overpower the unit while it is charging the battery.
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