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Renogy Eclipse panels?
#31
John
Do you actually own a panel ??
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#32
yeah you actually DO get a little charging. not much but some. highdesertranger
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#33
Efficiency is output vs footprint. So the same power in a smaller footprint is more efficient. Should footprint not matter then you move onto other considerations like production in sub par conditions, cost and availability. Also to consider is what type of system they are being run on. On a PWM system higher voltage and lower amperage just means more voltage is loss and fewer amps are delivered. On a MPPT system all of the voltage is used so the difference in amp output is minimal.

As far as seeing output under extreme low light conditions goes, seeing it can be a factor of what controller you are using. Park under a street light or full moon and test the Voc of your panel/s while disconnected and you will see a rise in voltage. Whether or not it is enough power to wake up the controller is a different question. My 250w panels would show output in low light conditions if connected to a Eco-worthy MPPT controller but do not on my Morningstar controller. The Morningstar does not see it as enough to even wake up.
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#34
(12-31-2017, 12:38 PM)highdesertranger Wrote: yeah you actually DO get a little charging. not much but some. highdesertranger
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(12-31-2017, 12:16 PM)John61CT Wrote: No **actually useful** amps are "harvested" by any panels from streetlamps or moonlight.
And yes, next set of eclipses I install, if a clear night with a full moon happens while I still have access, I'll measure actual charge output at the battery, which is what I'm talking about.
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#35
(12-31-2017, 04:39 PM)John61CT Wrote: Keywords highlighted below

And yes, next set of eclipses I install, if a clear night with a full moon happens while I still have access, I'll measure actual charge output at the battery,  which is what I'm talking about.

Have you any experience with the Renogy Eclipse panel?
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#36
(12-31-2017, 02:35 PM)jimindenver Wrote: On a MPPT system all of the voltage is used so the difference in amp output is minimal.

So would it be bad put my panels in series/parallel if I have an mppt controller? (Two panels in series, in parallel with two other panels in series. 40 Voc, ~10 Amps)


Would it be better to have all four in series for max voltage? (80 Voc, ~5 Amps)

Aaron 

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#37
FYI - I emailed Renogy tech support about series vs series/parallel for my intended setup and their only response is that both are valid, and they don't recommend one over the other. So unless I hear new information to dissuade me I plan to use the series/parallel setup.

Aaron 

Aspiring full-timer
2004 Extended E-350 SuperDuty build in progress 
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#38
Aaron, if your going to get four panels, I might suggest a cross wiring pattern.
By that I mean left front to right rear and right front to left rear...

As has been said before, if one is in shade or blocked, both are rendered out.
Does that make sense? Or am I over thinking it?

I only have 2 - 100 w Eclipse panels, and I think mine are wired in parallel so that if one gets blocked, the other still works great! I'm wanting to add one more in the future. More than 300 and I will need another mppt controller! Lol!
Thx, Dan'l
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#39
Depends on the MPPT controller. For sure anything under 30V won't get much extra efficiency from most, they need a wide possible V range to work their magic.

The Victrons for example have a lot of headroom for voltage, and I believe best efficiency requires higher than 40V.

Best would be to actually A/B test it yourself with your hardware combination: given pretty stable conditions, switch between e.g. 2s2p and 4s1p to see with an ammeter which config results in higher output - **charging amps** at the battery bank.

Ideally leave a flexible wiring setup in place so you could switch back to see in different conditions, easily add or replace panels, use portables easily etc.
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#40
Dan'l - I thought about a cross pattern, but I decided that was the worst option. If I get shade across the front OR back OR left OR right, all the scenarios would compromise both branches of my parallel circuit.

John - Well dang... that's a really good idea so now I'm going to have to figure out a way to install my wiring so that it's agile. (Once I finally buy my components.

Aaron 

Aspiring full-timer
2004 Extended E-350 SuperDuty build in progress 
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