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Old 11-02-2015, 09:54 AM   #1
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Solar Panels

I have a 2015 Nash Travel Trailer that has a 20 Watt Solar Panel installed on the roof. I want to add portable panels for each of my 12 volt batteries. I have no idea what size I need. Any input is really appreciated....product recommendations also welcome!!

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Old 11-02-2015, 10:25 AM   #2
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Give us more information about your batteries and electrical requirements.

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Old 11-02-2015, 10:50 AM   #3
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I would think two 100 watt 12 volt panels and a PWM controller or one 250 watt high voltage panel and a MPPT controller would be about what you need. Do you have an inverter?
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Old 11-03-2015, 05:57 AM   #4
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I wondered why they bothered with a 20w panel. That is just about enough to charge a cell phone. I would say 100 watts per battery. I started with a 100w Renogy suitcase portable, then decided that was a hassle and no on-the-road charging, so I mounted two 100w panels on the roof and a 30 amp PWM controller.
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Old 11-03-2015, 07:54 PM   #5
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I have a new 2014 Nash 23d Trailer with the same Factory Solar System from Zamp. The Solar Controller is spec'd at 7 Amps.

The 20 Watt Solar Panel handily mounted on top of the A/C Unit out of the way is intended as only a Battery Maintainer.

Because the 23d has a Slide Out, Dual Batteries are supplied. The Zamp Controller does fine at charging them slowly, and keeping them topped off.

Via the Rooftop Plug supplied, I can add another Solar Panel so long as the Zamp Controller Spec is noted.

I 'get' Solar very well, and understand how modest this 2 Stage Controller System is. I'll upgrade for Boondocking fairly soon, and recycle the Zamp Controller & Solar Panel for another non-Trailer function.

- Zamp 7 Amp Solar Controller -
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Old 11-04-2015, 12:18 PM   #6
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Originally Posted by tk3111951 View Post
I have a 2015 Nash Travel Trailer that has a 20 Watt Solar Panel installed on the roof. I want to add portable panels for each of my 12 volt batteries. I have no idea what size I need. Any input is really appreciated....product recommendations also welcome!!
This seems to be a pretty common starting point. Here are two articles to read that may get you started.

Is solar power for you? - JdFinley.com

Energy Audit - Watt For? - JdFinley.com

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