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10-21-2017, 03:31 PM
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#1
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Rivet Master
2007 27' International CCD FB
San Diego
, California
Join Date: Sep 2014
Posts: 2,123
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Nominal Output from 200W Solar?
Woohoo!!
Installing 200W of solar and just turned the system on for the first time. It's a Renology 2x 100W panels in parallel, with an EPEVER MPPT controller.
It's a bit overcast today, but I'm getting output. Shows 16V @ 6.5amp, or 104W on the PV input side. It's charging the batts 13.5V @ 7.5amps.
What are the nominal readings I should be expecting to see to assess health of the system? What kind of peak volts or amps should I see from the panels at mid-day? I get that it depends on panel alignment to the sun and I do not have perfect alignment as they sit relatively flat on the roof.
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10-21-2017, 03:42 PM
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#2
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,742
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Hi
Mounted flat in normal sunlight, you will never see more than 80% of the 200W. Your controller likely will knock another 5 to 10% off of that before you get to the battery. Part of that is wire loss which will not show up on the controller readout. What you are seeing sounds about right for an overcast day. You can have a 50% reduction in sunlight and still consider it to be moderate overcast.
Bob
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10-21-2017, 06:51 PM
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#3
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Full time Airstreamer
2014 30' FB FC Bunk
Anywhere
, USA Living.Somewhere.Yonder
Join Date: Jan 2014
Posts: 1,359
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I have 200w and that sounds about right. My biggest days are in the 550Wh range, so roughly 40 amps total.
Highest peaks are around 140-145w in bright sunshine.
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10-21-2017, 08:29 PM
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#4
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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That performance sounds about right. I have 2x 100 renergy panels and unless the batteries are really low it runs in the 5-7 amps at 14.3 V in full sun.
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10-21-2017, 09:59 PM
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#5
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Rivet Master
2007 27' International CCD FB
San Diego
, California
Join Date: Sep 2014
Posts: 2,123
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Thanks guys, that helps a lot.
Also a great point about battery SOC. Am I right that the input/output of the controller is as much dependent on the SOC of the battery as the sun? So if the battery was say 80% full, the controller won't be maximizing the output of the panels?
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10-22-2017, 08:39 AM
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#6
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Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,742
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Quote:
Originally Posted by pteck
Thanks guys, that helps a lot.
Also a great point about battery SOC. Am I right that the input/output of the controller is as much dependent on the SOC of the battery as the sun? So if the battery was say 80% full, the controller won't be maximizing the output of the panels?
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Hi
Indeed, once the battery gets "full" the charger will cut back. Some of them "burp charge" the battery. They totally shut down for a while and then go full bore (where that's maybe 7A) rather than tapering back and running 1 or 2A forever and ever. Turn on some sort of load if you want to see what the "full output" of the charger is.
Bob
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