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Old 01-20-2020, 10:32 AM   #1
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Solar panel setup for charging house battery

What wattage solar panel would be needed to charge house batteries for 33' 2005 Newmar KountryStar class A - gas motorhome while stored at home? We have a 700 watt inverter that came in the camper.

Camper is parked in our yard but too far away to plug into home elec.

Thanks for any help you can give us.
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Old 01-20-2020, 10:37 AM   #2
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If all you want out of solar is to keep batteries topped up while the coach is not in use, about anything down to about 10w will do if you have sufficient sun. I think that’s what comes (or came) standard on many Newmar coaches for about a decade at least. I’d go bigger, but stay with 12v. Talk to Randy at BestConverter - Converters, Inverters, Electrical Supplies, Electronics for a good solar battery charger.

If you want a more useful system there are several threads going here discussing more than you need or want to know(), but informative.
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Old 01-20-2020, 10:41 AM   #3
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Quote:
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What wattage solar panel would be needed to charge house batteries for 33' 2005 Newmar KountryStar class A - gas motorhome while stored at home? We have a 700 watt inverter that came in the camper.

Camper is parked in our yard but too far away to plug into home elec.

Thanks for any help you can give us.
This one has loads of good info:
http://www.irv2.com/forums/f103/lets...up-472435.html

This one gets a little wonky, but still some good info:
http://www.irv2.com/forums/f50/solar...or-473578.html

Just winnow our the nuttier, off topic, opinion page, naysayer stuff and you’ll have a good start.
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Old 01-21-2020, 08:54 AM   #4
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Quote:
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Camper is parked in our yard but too far away to plug into home elec.
Maybe too far to run a AC off a good series of extension cords, but not for a charger. Your 2005 rig may have a dumb charger so I would use a smart 3 stage charger hooked to the extension cords.
If still hung up on solar, 50W/battery...maybe just portable panels.
Not sure what the 700W inverter has to do with your question...are you running something with it while in storage???
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Old 01-22-2020, 07:14 AM   #5
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Solar panel setup for charging house battery

We would like to run a milk house heater - to run when temp hits 32 deg.

We're new at RV'ng. We've had our rig less than a year. Still trying to learn how to use things. Never had an inverter before, so this is a total learning experience.

Just trying to determine what can be done and what can't.

Thank you for your input.
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Old 01-22-2020, 07:33 AM   #6
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Your not going to be able to run, constantly, a milk house heater off batteries and solar, without having an extensive system, including a larger inverter.

As an example, a milk house heater will draw 500, 750 and 1500 watts, depending on its setting. Even on low, you will need 500+ watts of solar and that will only be for 5 bright sunny hours a day. For the other 19 hours you will need huge batteries to cover the load.

You will be better served by running electric to the spot where your storing it.
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Old 01-23-2020, 05:24 AM   #7
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So, how far away is it?
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Old 01-24-2020, 08:11 PM   #8
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Solar panel setup for charging house battery

It's about 250' from the house.
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Old 01-25-2020, 06:08 AM   #9
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You can buy 250’ of 10-2 wire on EBay for $139 delivered. It will even let you run the heater on high...more amps than a battery charger. I’d say it will even start the AC unit ...definitely will with a soft start added to the AC.
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Old 01-26-2020, 05:54 PM   #10
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Solar panel setup for charging house battery

This is a consideration. Thanks.
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Old 01-27-2020, 06:59 AM   #11
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You could make a 250’ “ extension cord” or if you want something more permanent, use direct burial under ground just deep enough that you won’t disturb it while gardening or whatever and plant a post with a 30amp RV service outlet ($35 from Home Depot ). You’d still be in it a lot cheaper than any solar set-up useful for your purposes (running a heater etc) and it would be useful day or night rain or shine.
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Old 01-28-2020, 06:57 PM   #12
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Solar panel setup for charging house battery

I think we'll probably go with the 10-2 buried. Sounds like the best way to go.

Thanks to you all for your suggestions.
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Old 01-28-2020, 08:53 PM   #13
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At 250 feet you are better off with 8 awg wire to keep voltage drop to about 5%.
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Old 01-28-2020, 10:24 PM   #14
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I think we'll probably go with the 10-2 buried. Sounds like the best way to go.

Thanks to you all for your suggestions.
Buy direct burial (gray) - not regular romex. It’s not as easy to work with but much more resilient.

https://www.homedepot.com/p/Southwir...6755/202316282
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