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Old 05-27-2013, 02:31 PM   #11
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Quote:
Originally Posted by Himcules View Post
think you got a typo...

watts = amps * volts.

so 2400 watts = amps * 120 volts

so amps is 20Ah needed...

12 Volt Batteries X 200 amps equals 2400 watts

P (Power in terms of Watts) = I (Amperage) x E (Voltage)
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Old 05-27-2013, 02:38 PM   #12
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So...if your calculations are correct, then 2 70ah batteries will keep me above the 50% threshold on the batteries. But that also doesn't include the power hungry furnace. Hmmm...
2 70ah batteries won't do it, as stated, he based it on 120v batteries. You batteries are 12 volts, so you need 200ah just for the mattresses. You would definitely need at least 4 220ah golf cart batteries in my opinion.

Just remember, it take 20 amps at 120v to make 2400 watts, but it takes 200 amps at 12v to make 2400 watts.
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Old 05-27-2013, 02:42 PM   #13
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Quote:
Originally Posted by ChooChooMan74 View Post
12 Volt Batteries X 200 amps equals 2400 watts

P (Power in terms of Watts) = I (Amperage) x E (Voltage)
do all calculations need to be converted back to 12volt whenever an inverter is used?
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Old 05-27-2013, 02:47 PM   #14
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do all calculations need to be converted back to 12volt whenever an inverter is used?
Yes. Watts is watts, no matter if it is 12 volts or 120 volts. That is the amount of power something takes. And, there are inverter inefficiencies that were not calculated in. But, I didn't count that, because after a few hours, I bet he would put his heated mattress down to 1/2, unless, he is camping in below freezing temperatures.
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Old 05-27-2013, 04:53 PM   #15
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i've never seen any post about someone doing this.
without a large battery bank, i don't think you could do it for the whole night.
and the furnace drain would add to the problem.
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Old 05-27-2013, 05:18 PM   #16
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But see...this is why I love the forum. When you have an idea and unsure whether it will work, you can ask before spending $$$ and it not working. Still might pick up a 1500 to run a TV/DVD for entertainment.
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Old 05-27-2013, 05:29 PM   #17
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too put it simply ... heat means power in the 12volt world ...
inverters just add confusion to the equasion ...
simple facts ...
the more storage space on-board .. like two large 12volt deep cycles in the 31 size range, or some a 6 volt combination ... the less your in the battery burn-out zone .. which every retailer like to see ....
hey its camping .. yea my wife enjoys the heated matteress ... but if you are off line .. enjoy the surroundings .. and monitor the 12 volt power ..

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Old 11-12-2014, 06:20 PM   #18
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I have RW Windjammer3006W. I plan to power a 70 watt heated mattress pad, while towing. I use an AIMS 180 watt pure sine inverter, plugged into the 12v socket under the TV.
Will this combo work while I tow? Will also run refrig & furnace.
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Old 11-12-2014, 07:45 PM   #19
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Wheww! I think I'll stick with a good pair of insulated long johns and a pair of wool socks. A little coziness with my sweetie won't hurt either.
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Old 11-12-2014, 08:04 PM   #20
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Regardless of what you run on the inverter, running a 1500W inverter at 80% will drain over 100amps per hour from your battery. Two 70 Ahr batteries drawn down to 50%. will not last an hour.
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