12 volt appliances - Page 4 - Fiberglass RV


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Old 08-03-2016, 12:04 PM   #43
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Quote:
Originally Posted by Steve L. View Post
Well, if you don't mind your power tools smelling like margaritas...
Have no problem making Margs without the use of a power tool &/or wasting battery power.

Simple pick up an old hand crank ice crusher from a thrift store. Or you can go higher tech and get a larger Vortex hand crank blender.

Have field tested both and Trust me they both work like a charm!
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Old 08-03-2016, 12:46 PM   #44
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Remove the hand crank and replace it with a model airplane engine.
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Old 08-19-2016, 10:31 PM   #45
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Here is something to put on your 12v/120v stove-
https://smile.amazon.com/Hawkins-Cla...ressure+cooker
I bought my second one in May. It made great blackeyed peas in 15 minutes on Wednesday. I just love it!
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Old 08-20-2016, 12:25 PM   #46
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I like pressure cookers too. I have 2 Kuhn-Rikon, (large & small,) ones at home and a Fagor 6 Qt. for the trailer. Very efficient and quick.

For the trailer:
Fagor Rapid Express 6.3-Quart Stainless Steel Pressure Cooker - BedBathandBeyond.com

For the house:
Duromatic® Family Style Stockpot 11" 12-qt | Kuhn Rikon

Duromatic® Family Style Braiser | Kuhn Rikon
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Old 09-19-2016, 10:00 PM   #47
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I'm no math whiz, so I can't cite the equations, but I do know that anything 12 volt that produces heat by use of a coil, like heaters, hairdryers, coffeemakers, etc. are big drains on a battery. It's basically a controlled short circuit. That's also why incandescent lights draw so much more power than LEDs. Appliances with motors aren't much better, if at all.

Having said all that, I was looking into 12 volt televisions and stumbled onto My 12 Volt Store. All kinds of nice toys to look at, some promising, some not so much. From my browsing, they do seem to have the best prices on the televisions.
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Old 09-20-2016, 07:59 AM   #48
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Hot and under pressure? My instinct is to *not* trust anything like that, especially in a confined space, like my camper!
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Old 09-20-2016, 11:23 AM   #49
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Originally Posted by David in Maryland View Post
I'm no math whiz, so I can't cite the equations, but I do know that anything 12 volt that produces heat by use of a coil, like heaters, hairdryers, coffeemakers, etc. are big drains on a battery. It's basically a controlled short circuit. That's also why incandescent lights draw so much more power than LEDs. Appliances with motors aren't much better, if at all.
The math turns out to be really simple - just multiplication. Here's an easy example:

My wife has a 1200 watt hair dryer I want to run on my battery (she doesn't really, but it's an easy example. Why not me? I don't have much hair these days...)

Power is amps times volts (P=IV). If power is 1200 watts, and volts is 120, then, sure enough, that's 10 amps. Glad your trailer has a 30 amp supply if you're also running the air conditioner and a coffee maker at the campground...

Now the bad news. The battery is 12 volts. So I need 100 amps to power the hair dryer from the battery. If the battery is 100 amp hours, I can have a theoretical maximum of one hour run time before I've completely flattened the battery.

In the real world batteries don't respond well to maximum loads like this, and you never want to discharge the battery below about 50% capacity for maximum lifespan. We won't get into inverter efficiency calculations.

The wattage draw for nearly anything can be found out. Often it's on the labeling or in the manual. If not, it's usually pretty easy to measure.

Basically, it's all about the work you're doing. Heating things up is work. Running motors that move something is work. Work over time is total energy used. Running a little LED light isn't much work, so a battery can do it for a very long time indeed. Example:

The 12V interior LED light strip I installed in the Casita draws 250 mA (0.25 Amps) at full brightness. How long will my 60 Amp Hour battery run it?

60 amp hours / .25 amps per hour = 240 hours. So yeah, not a big worry.
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Old 09-20-2016, 02:13 PM   #50
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Hey David,

I think you'll find better prices here:
12v tv, Electronics - Newegg.com

And, steelypip..... that's a nice, concise, and practical explanation of Ohm's Law. Thanks.

Gordon
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Old 09-20-2016, 04:07 PM   #51
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Originally Posted by Gordon in Idaho View Post
Hey David,

I think you'll find better prices here:
12v tv, Electronics - Newegg.com
Oh yeah - Between Amazon and Newegg I'm somehow always broke. Go figure. Newegg's got 'em beat on Naxa TVs, but they don't carry anything over a 24" screen. I'm figuring the Jensen 32" will be mine one day.
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