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Old 05-09-2010, 05:59 PM   #1
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How much PV wattage installed?

Rough measurements, it appears my 30' Classic would support (4)175W panels at 62"x32" each.

Anyone max'd out their roof real estate on a 30' model? How much wattage are you sporting? What kind of performance do you get?
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Old 05-09-2010, 06:52 PM   #2
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hi fc'

there are a couple of threads here on 4 panel systems approaching 4-600 whatz....

not 1 of them but see posts starting at #33 here for a 390w array...

http://www.airforums.com/forums/f448...ice-39392.html

not a 30 foota' and...

not on the trailer either

and still plenty of roof top space.

but the artman is running a DEEP freeze with this set up and has a 'hole lotta party lights...

IF going to the expense of 4 panels consider 4 batteries minimum...

and perhaps consider MIXING panel types (like include 1 that is optimized for partial shade?)

cheers
2air'
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Old 05-09-2010, 07:30 PM   #3
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Rule of thumb is to match a watt of solar for each pound of battery.

But realize that RV's are quite limited both for the amount of energy they can carry in batteries (about 10 to 15 watt hours per pound) and in the area available for solar (very seldom more than 500 watts). That's perhaps fifty cents of electricity if you bought it off the grid or maybe a tenth of nominal indoor household use.
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Old 05-10-2010, 05:03 PM   #4
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That's interesting. My (2) SRM27's are a total of 110lbs, and 200 Ahr... loading up with 700W of panel would be be wasting a lot of free sunshine, yes- but cover all the bases (if u will) on cloudy days, tree shadows, non-optimal solar orientation...
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Old 05-11-2010, 12:25 AM   #5
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200 AH @ 12v = 2400 watt hours. at 110 lb, that's 22 watt hours per pound. Since the cost effective use recommendation is a nominal 50% capacity, that's 11 watt hours per pound usable battery capacity in this case.

700 watts of solar panel would be an interesting challenge to get on top of an Airstream trailer. Even class A's have difficulty squeezing that much panel up top. At 4 hours peak to accommodate averaging, that's 2800 watt hours daily energy input.

Considering that typical average daily use should be about 40% of available battery capacity, that's 480 watt hours per day for a 2400 WH battery bank. A 700 watt solar system is providing almost 6 times the nominal battery refill needs. That means a lot of leeway for solar efficiency reduction.
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Old 07-04-2010, 07:46 PM   #6
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AM Solar on Riveted Blog

Hi Joe,

I donít have any answers for you on the roof real estate issue, but i have been kicking around this same idea.

I was really impressed with this set-up ( Riveted: Technology ) by AM Solar. So I contacted them to get a price. This is what Roger at AM sent me back:

400 watts of solar, a 30 amp MPPT controller, a 1000 watt inverter with built-in converter/charger and battery monitor, 6 AGM batteries (total capacity of 900 amp hours), and all the interconnecting hardware, fuses, sub panels and breakers for $9700.00.


That includes installation, but Wow, not cheep! I figure about $6000.00 of that price is labor. I think itís going to be a DIY project if I decide to do it.

I was think I could fit some AGMís under the bed, and replace the two stock batteries as well. But the biggest obstacle in my mind is running the wiring.

JC may have a roof drawing for the 30í Classic, I found this one but has not been much help for me.

-Steve-
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File Type: pdf solar 27.pdf (40.4 KB, 45 views)
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Old 07-07-2010, 11:26 PM   #7
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We just hooked up a single 130 watt panel to our Airstream. Take a look at this PDF of our little project. We're quite pleased with the results.
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