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Old 11-21-2015, 05:20 AM   #155
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Looks like a nice install, congratulations.
The older airstreams seem to have more curve in the roof, which means more visibility and mounting issues.
I read Lewster's post on the warping issues, and having handled these flexible panels, I am not surprised they warped!
They should be mounted better than that.
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Old 12-01-2015, 10:06 AM   #156
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I was over working on my rig yesterday, and decided to put my 30w unit up on the roof to boost my battery while I worked.
Before I connected it to my battery(directly with no charge controller), I checked its output... It was reading 21v.. Is that normal/OK?
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Old 12-01-2015, 10:56 AM   #157
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Oh, here is the spec on the back of the panel.
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Old 12-02-2015, 05:32 PM   #158
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That's a pretty common Open Circuit voltage but it really does need a charge controller between it and the battery unless you are gonna sit and stare at the voltage, disconnecting it when it passes 14 volts. (I've done that when I was in a pinch)
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Old 02-23-2016, 10:31 AM   #159
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Renogy Flexible Solar Panel Recall

Not sure if there is a thread for this already.
Last year, we installed the Renogy 100 Watts 12 Volts Lightweight Monocrystalline Solar Panels and now they have been recalled.

Anyone else have these solar panels?
What would you recommend replacing them with that is still a flexible panel?
(Yes, we like them. They worked great for us. We just have two). Thanks.

-----
Recall Info http://www.cpsc.gov/en/Recalls/Recal...-Solar-Panels/
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Old 02-24-2016, 04:43 AM   #160
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Flexible solar panels have been characterized in this discussion thread as losing efficiency over time due to heat build-up caused by being mounted directly on surfaces (in this instance trailer roofs) without airspace behind to allow air circulation/convection to cool the panels. This is the first time I have read of actual fire risk, but fires may have occurred when they are mounted on a readily combustible surface such as wood.
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Old 02-24-2016, 07:05 AM   #161
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Not only that, but their output is limited when compared to hard panels….especially on a curved roof surface like an Airstream.

I have been using 5 X 100 watt flex panels from Grape Solar on my Sprinter service van for 18 months and can state unequivocally that their output is, at maximum, only 55-60% of what a GS-100 hard panel produces.

Using the same physical components from my prior system when I used 5 of the GS-100 panels (Blue Sky 3024iL controller, iPN-PRO remote, 200 amp/hour lithium battery and Magnum MS-2812 inverter), the new array of flex panels only produces a maximum of 22-24 amps to the batteries, while the GS-100 panels would often show 32-35 amps at maximum output.

My flex panels are mounted to a sheet of .090 aluminum which is bonded to the roof of the Sprinter. This produced a smooth, flat surface which is also slightly elevated above the roof, as the Sprinter has raised ridges for structural stiffness, and totally free of any obstruction which enables 100% of the available solar radiance to reach the panel surface. This allows for air flow under the panels and also utilizes the aluminum base as a heat sink.

I would NOT RECOMMEND flexible panels to anyone looking to obtain the maximum efficiency and output from their solar array. These will be coming off the roof in the next few weeks and replaced with another array of 5 GS-100 panels.
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Old 02-24-2016, 10:10 AM   #162
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Saw this in the last couple of days on the Renogy panels that are affected.

http://www.cpsc.gov/en/Recalls/Recal...-Solar-Panels/
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Old 02-24-2016, 11:22 AM   #163
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Does anyone have experience with a small portable Charge Controller I can use with my 35w panel? I have been moving it about between 3 different vehicles, and want to have a little charge controller to wire inline with it...
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Old 05-10-2016, 07:05 AM   #164
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Grape Solar vs. GoPower Flexible panels

Have heard good reviews of these two panels:
Grape Solar GS-PHOTOFLEX-100W: $250 Module eff. 17.6%
GoPower (Carmanah) GP-FLEX-100E: $500 Module eff 19.6%
Warranties seems to be the same.
What more do we get for twice the price?

73/gus
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Old 05-10-2016, 08:18 AM   #165
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Quote:
Originally Posted by gklott View Post
Have heard good reviews of these two panels:
Grape Solar GS-PHOTOFLEX-100W: $250 Module eff. 17.6%
GoPower (Carmanah) GP-FLEX-100E: $500 Module eff 19.6%
Warranties seems to be the same.
What more do we get for twice the price?

73/gus
MARKETING!!!!!

And don't believe those high efficiency ratings from Go Power!! They use the same SunPower cells that every other flex panel uses, so why another 2% on panels that are virtually identical.

Show me an INDEPENDENT TEST of all of the 100 watt flex panels out there and they will be within tenths of a precent of each other.
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Old 05-10-2016, 09:11 AM   #166
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Thanks. Any other differences in packaging, etc between the two? Cannot discern much difference in the tech specs.
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Old 05-10-2016, 01:47 PM   #167
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Originally Posted by gklott View Post
Thanks. Any other differences in packaging, etc between the two? Cannot discern much difference in the tech specs.

Nope! Like I said........ marketing!!!!!


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Old 05-11-2016, 12:08 AM   #168
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Not everyone has had positive experiences with the "flexible" panels regardless of brand.
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