Dual 160w roof solar + 90w portable - possible? / 320w :run fridge? - Escape Trailer Owners Community

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Old 08-08-2016, 06:26 PM   #1
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Question Dual 160w roof solar + 90w portable - possible? / 320w :run fridge?

Hi all

On the home stretch of the final detail of our 21'

I don't want to debate the merits of towing with the fridge on propane.... i prefer not to. I know this is hotly debated. I would prefer not to debate that....

My question is.... ETI tells me that they CAN put dual 160 w solar panels on a 21' on the roof, as long as it is done during the initial build. I'm pretty sure this is so they can re-enforce and do blocking as need be, to make the 2nd panel secure.

Yes we are getting HVAC, and they know this.

Yes we are getting the dual 6v.

I also have a 90 w portable panel... i'm going to have ETI wire in my pigtail during the build.

We like to boondock... sometimes in the cloudy snowy mountains.

My 1st question is.... would the stock solar power system be able to handle 160w + 160w + 90 w?

Just in case we are in the shade, it is grey, and we have the portable panel out, and while we are hiking the sun comes out.

The second question is - assuming fully charged dual 6v..... and sunny California towing..... i am guessing that having 160w + a second 160w on the roof could pretty much run the fridge on electrical?

Our tug does a pretty good job of feeding power back, as well (after I had much thicker wire wired in my a towing shop. The stock tow package wire was a joke )

thanks
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Old 08-08-2016, 06:53 PM   #2
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See my post on the thread "dual solar panels on a 21" it's post#2.


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Old 08-08-2016, 07:09 PM   #3
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Quote:
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See my post on the thread "dual solar panels on a 21" it's post#2.


John
Hi John

POST #2 there says "Hi: OldstersOutside... Ask Jubal; he knows every thing about wiring an Escape trailer!!! Alf"

You're not Alf. and I don't know who Jubal is.

I'm confused.
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Old 08-08-2016, 07:11 PM   #4
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Originally Posted by Losangeles View Post
Hi John

POST #2 there says "Hi: OldstersOutside... Ask Jubal; he knows every thing about wiring an Escape trailer!!! Alf"

You're not Alf. and I don't know who Jubal is.

I'm confused.
It was actually post #4. Direct Link: Dual Solar Panels on a 21
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Old 08-08-2016, 07:18 PM   #5
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Sorry gang. Just looked, it's post 4. If memory serves, I had a seniors moment there. Mostly memory doesn't serve. I just wish it would let me know when it let's me down! Thank for catching me.

John (red faced, not from sun)
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Old 08-08-2016, 07:20 PM   #6
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For #1, yes, the stock 30A controller can handle the 3 panels but it's not the most efficient setup. You'd be better off going MPPT.
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Old 08-08-2016, 07:41 PM   #7
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Mppt??
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Old 08-08-2016, 07:45 PM   #8
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Old 08-08-2016, 07:45 PM   #9
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To directly answer your questions.
1. The stock controller is rated for 30 amps. The manual states the controller can take up to 495 watts at 12v. You look to be ok but are getting close IMHO. The controller manual also states the max voltage it can tke from a panel is 28v. The ETI supplied panels have an output voltage of 17.2 v. There will be some drop thru the wires to the controller. I don't know what that will be. You should check he voltage output of your portable and contact the ETI supplier (currently gopower/samlex).

2. In my experience with our rmd 8555 fridge two x 160 panels will power the fridge while towing or not towing if they are in direct sun. In cloudy conditions they will come close to doing so. Our fridge uses 2-3 amps at 110 volt. That's 220-330 watts. But it's only intermittent usage, more duration depending on ambient temp. My experience is at 80-90 F. Not 100 plus.

John (not gonna say what post # this is)
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Old 08-08-2016, 08:19 PM   #10
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Quote:
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Mppt??
There are 2 types of solar controllers PWM and MPPT, MPPT's a bit better then PWM under certain conditions.

It's a moot point as ETI only installs PWM. Forget I typed it.
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