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Old 12-01-2015, 12:31 PM   #1
JMC
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29BHDS solar

We just ordered our trailer, but i have been researching solar for a couple months. We plan to dry camp a lot and don't want to hear a generator where we'll be camping... at least not our own generator.

I've been looking for deals on the parts I want to use. And already have the big items purchased/delivered. The system will use:

* 705W solar via (3) 235W panels
* (4) CR260 6V batteries - 260 AH
* Magnum MS1012 pure sine inverter + 50A charger
* Morningstar TS-MPPT-60 solar controller
* AC sub-panel for trailer outlets
* Proper breakers, fuses and on/off switches and wiring

I will likely hold off on buying a generator in hopes that we don't need one. If we need one for any reason, I'd like to limit it to a 2000W Honda that's converted to LP.
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Old 12-01-2015, 12:32 PM   #2
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Can someone confirm where the Jayco "solar ready" wiring terminates inside the trailer? Based on earlier posts on the forum, it sounds like its #8, which will be good enough for me...
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Old 12-01-2015, 02:01 PM   #3
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Hmmm 705 watts I would be wanting bigger than 8ga wire.. I run 4ga from each panel to the roof junction box then 1ga down to the charge controller.. 00 between each battery and to the inverter..
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Old 12-01-2015, 04:19 PM   #4
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Yeah, hoping to use as little of the #8 as possible to get me through the roof. And then I'll take larger wire to the controller.

And the panels are 24V and rated at 30. I plan to try them in series which would equate to 90V @ only 7.8A.
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Old 12-01-2015, 04:36 PM   #5
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I just starting on this learning about solar, but isn't that a heck of a lot of solar wattage for just 4 batteries?

Is there enough shade fee real estate on the roof for that much panel?

I'm thinking ahead to solar, but was thinking of 2 batteries to start. I'll be curious to see how yours comes together.
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Old 12-01-2015, 06:19 PM   #6
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I got a great deal on the panels. Craigslist find for $0.81 per watt; brand new panels. Hard to pass up...

So I probably have a little more than I "need" but the worst case is that I'm fully charged by 11AM and end up throwing away some power. The broad rule of thumb is a watt of solar per AH of battery. I'm at 705W on 520AH.

I pulled up the calculator on the wire gauge and loss. If i run the panels in parallel over 10 feet of #8, its a ~0.5% loss. Ran in series is ~0.06% loss. I'm comfortable with these. I'll run some larger wire starting at the first spot I can inside the trailer.
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Old 12-01-2015, 06:55 PM   #7
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Do you have the manufacture/model of the panels?

Just to insure you are getting what you ordered on Craig’s list (or even eBay) take each individual panel and verify its output against what the mfr specifications have for that panel. Not that it will happen to you but a lot of the panels sold on those sites are new, but are either blemished (can affect ouput) or panels that did not meet the manufactures specifications.

Just check them out before you mount them on the roof.

Don

You may find some additional information on the "RVing with SOLAR" Social group under Comunity.
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Old 12-01-2015, 07:05 PM   #8
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That's a good idea... i'll check them.

they are LDK brand. Model is LDK-235P-20.
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Old 12-03-2015, 07:00 AM   #9
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AFAIK if you put them in series and part shade one panel you lose all of them. Parallel avoids this at the expense of bigger wire.
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Old 12-03-2015, 07:55 AM   #10
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Yep, i've seen some of the shade threads online. There seems to be enough agreement that shade is "complicated" that I'm going to try series first. My panels have six bypass diodes, which evidently helps with the shade factor. Worst case is that I have to move them to parallel... thanks!
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