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Gulfcoast's avatar
Gulfcoast
Explorer
Nov 11, 2019

How much SOLAR?

Another kinda vague solar question... but it's about the best I can do.

If a guy headed to southern Arizona in the winter months and wanted to have enough solar for a TV, travel trailer furnace, lights, to charge a laptop daily, and keep the trailer electronics going....

On average, how many watts would I need? 200 - 300 - 400? I will use 6-volt golf cart batteries.

You guys that do it often have some idea on what is needed.

Thanks for your help.

37 Replies

  • 500 watts and 8 batteries. Like most of these things, it is just a wild guess without facts and measurements.
  • 2oldman wrote:
    Furnace is about 7 amps. The best answer I can give is 400, or, all you can afford and have room for. I did ok on 360 for years, but, just ok.


    X2
    I think you would get by just fine with 400 watts.
  • Check on line insolation tables for that location at that time of year to see how much sunlight to expect daily.

    Need to know if panels will be flat on roof or if you can tilt them up facing South where you are parked. Or will they be ground mounted (portable) so you can aim them South tilted up? Can you move them around during the day to aim at the sun plus have them tilted up?

    Big difference in AH haul per wattage of panel depending on your set up.

    Most have flat on roof so it doesn't matter which way you park, and no fuss with portables, but it means more panel watts to get the job done.

    But if the roof has too many obstructions so you can't get many panels in the open spots, you have a limitation there. You might have to use several small panels instead of a few big ones.
  • Furnace is about 7 amps. The best answer I can give is 400, or, all you can afford and have room for. I did ok on 360 for years, but, just ok.
  • I have LED lights and tv, I will try to get the amp draw of the furnace.
  • Do an energy audio so that you have an ball park idea of your requirements. This will help to estimate your needs otherwise it's just a wild guess. You could be in the 400-500W range.

    Non LED sights and furnace may be your biggest draws and maybe the TV.

    I decided to first install a battery monitor to get a reasonable estimate.

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