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Old 11-09-2017, 09:17 PM   #1
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My solar system

I now have 4 100W flexible panel on top of my bimini. They are attached with zippers and flaps over the zippers to protect them, so they will not come off. I have the panels wired in series to make 48v and 5.6 amps. Mppt controller. I have a pic of the remote panel attached. Does anyone have any comments or suggestions weather to go all series or parallel or combination of both. I have four 6volt trojan L16's la wired serial/parallel for my house and one 4d for my starter.
Thank ia
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Old 11-09-2017, 10:55 PM   #2
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Each MPPT is different, just pick a clear sky day and be ready to test different combo's for highest total output, into a battery at 50%, ideally all within an hour around noon.
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Old 11-09-2017, 10:58 PM   #3
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Yes i never had the chance to so that yet. I suppose i only have a few options with what i have. I have trace mttp controller.
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Old 11-10-2017, 02:44 AM   #4
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An MTTP controller goes through a test cycle to determine the most efficient setup. This often takes a few minutes.
When doing comparison tests, give it time to stabilize before measuring output.
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Old 11-10-2017, 06:00 AM   #5
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I now have 4 100W flexible panel on top of my bimini. They are attached with zippers and flaps over the zippers to protect them, so they will not come off. I have the panels wired in series to make 48v and 5.6 amps. Mppt controller. I have a pic of the remote panel attached. Does anyone have any comments or suggestions weather to go all series or parallel or combination of both. I have four 6volt trojan L16's la wired serial/parallel for my house and one 4d for my starter.
Thank ia
Attachment 70196

The way I see it ... In Parallel @ 12 VDC: On an optimum day, you may get 24 - 26 +/- Amps and this will drop off substantially as you lose sunlight. ( I assume that you have the wiring @ at least 30 A / 10 Ga. )
In Series @ 48 VDC +/- : On an optimum day, you may get 5.6 - 6.6 +/- Amps but you will get this longer even if you lose sunlight ( until cut off. )
It's a " you can't get something for nothing " type of thing ......

On my 3 @ 140W rigid panels ( now in series ) I'm seriously considering rewiring to parallel for next year. FB
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Old 11-10-2017, 07:48 AM   #6
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My 2 x 300w panels are in series. This is a typical day.

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What kind of boat is that?
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Old 11-10-2017, 10:14 AM   #7
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My 2 x 300w panels are in series. This is a typical day.

Attachment 70204Attachment 70204

Hey Bob, Very impressive Amps ! and @ 36 V and 20 A give / take ea. they may as well be in series. In my case, I chose the 12 V panels just in case I wanted them in parallel. FB
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Old 11-10-2017, 10:48 AM   #8
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Quote:
Originally Posted by Bob Cofer View Post
My 2 x 300w panels are in series. This is a typical day.
Bob:

Just for fun, I converted the input and output of your controller to watts: 314 and 317 respectively. Hmm, a little first law violation?

David
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Old 11-10-2017, 11:13 AM   #9
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Bob:

Just for fun, I converted the input and output of your controller to watts: 314 and 317 respectively. Hmm, a little first law violation?

David
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Old 11-10-2017, 05:58 PM   #10
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I came for a model of the sun, the planets, and the moons. I am leaving disappointed. :-P
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Old 11-10-2017, 07:42 PM   #11
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Series is better if you get shading.
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Old 11-10-2017, 08:27 PM   #12
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You can get a lot of opinions on this, but YouTube has some nice demo’s on both that might be helpful to check out.
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Old 11-10-2017, 08:28 PM   #13
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Thanks i will have to watch somr videos
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Old 11-11-2017, 07:06 PM   #14
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Series is better if you get shading.
Isn't that just backwards? With series panels, if one is shaded and does not produce then the whole string id out. Think old-style X-mas tree bulbs.
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Old 11-11-2017, 07:07 PM   #15
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Im not sure if it works like that, but what do i know. Learn something everyday.
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Old 11-11-2017, 07:44 PM   #16
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According to solar panel expert, I copied and pasted their response regarding whether to series or parallel 2 panels where some shading is unavoidable...

"So, this kind of shows you, that if you do have some partial shading, and itís on only one of the panels at a time, so say youíve got a chimney that you really have no control over, or if itís on a sailboat, and youíve got the mast that is kind of important, if youíve got partial shading thatís going to be changing, itís better to wire them in parallel to give the parallel path for the non-shaded panel. Ideally, and I know I say this a lot, ideally each panel should have its own charge controller, that way you will get absolute maximum performance, but if itís not an option, wiring in parallel with partial shading is your better solution."
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Old 11-25-2017, 08:44 PM   #17
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Old 11-25-2017, 08:58 PM   #18
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Quote:
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According to solar panel expert, I copied and pasted their response regarding whether to series or parallel 2 panels where some shading is unavoidable...

"So, this kind of shows you, that if you do have some partial shading, and itís on only one of the panels at a time, so say youíve got a chimney that you really have no control over, or if itís on a sailboat, and youíve got the mast that is kind of important, if youíve got partial shading thatís going to be changing, itís better to wire them in parallel to give the parallel path for the non-shaded panel. Ideally, and I know I say this a lot, ideally each panel should have its own charge controller, that way you will get absolute maximum performance, but if itís not an option, wiring in parallel with partial shading is your better solution."
Yes.

And if you standardize on Victron 75/15 at under $100 each, match your panels to maximize the SC output, you can get 1:1 ratio at **lower** cost than multiple panels per larger SC.

40-50Voc, maximum 65
200-240W, up to 300 if you get a super deal and not compromising maximum watts over your available square area.

Double those watts for 24V banks

Such overpanelling will increase *average* watts output when conditions are less than optimal.
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Old 12-15-2017, 09:11 PM   #19
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Attachment 70697my solar panels on the bimini.


What brand flexible panels did you use? Supplier?
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Old 12-15-2017, 09:15 PM   #20
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I used a local supplier who sells them. Im not sure of the manufacturer. But seem to good quality and work very well on sunny days
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