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Old 05-14-2013, 09:46 AM   #1
Join Date: May 2013
Location: Lander, Wyoming
Posts: 80
Solar - How much wattage?

I'm getting ready to put solar panels on my unit. I'd like to be able to run the TV and DVD a little in the evenings and then of course, lights but not necessarily the fridge and furnace.

How much wattage do I need? I"m thinking about 250w with a converter to keep batteries charged and the power I need.

If there's another discussion on this somewhere, please point me to it.


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Old 05-14-2013, 07:24 PM   #2
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Join Date: Jul 2010
Location: Desert SW - Arizona
Posts: 5,887

Here is a link that may start you on your way.

How many batteries do you have? One or two 12volts?
What is their cold cranking amps?
What condition are the batteries? New? 2 years old?
After you have this information then you total up your total 120 volt wattages.
Now a 250 inverter will run the TV how long?
You must have sufficient 12 volt battery power to maintain the 250 watt output for?
All night? 1 hour? 2 hours? That is how you figure how long it will last before the batteries goes dead or down to 10 volts or less.
So another question is when do you plan to need the DC to AC inverter?
While driving?
While dry camping?
What size solar panel will maintain your batteries?
Lots of questions here and you need to do and answer many questions before asking what size inverter do I need.
Hope to hear from you soon with you full explanation.

2012 Georgetown XL - 378TS 49,000 miles
(2013 - 98 days) (2014 - 117 days) (2015 - 67 days) (2016 - 115 days)
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Old 05-14-2013, 07:39 PM   #3
Join Date: May 2013
Location: Lander, Wyoming
Posts: 80
Got It

I've got two Interstate deep cycle hooked in parallel. They are each 550 CCA and 690 MCA. I've pulled them every winter and kept them charged so they should be in good condition. They are 2 years 9 months old. The only wattage I'll be using is for a 24" TV and a DVD player which is what? I talked to a solar panel company guy today and he said I should have at least a 1000/2000 watt inverter ($130). I'll run the AC power to just one outlet box. A friend has a similar system that runs his TV and DVD player for several(3-5 hours a night). So only need the 110AC in the evenings when dry camping. He has a 250 watt solar system So since I asked the question earlier, I guess I've got my answer?
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