12 volt AC

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12 volt AC

Postby glenn201 » Sat Apr 29, 2017 4:02 pm

has one tried using peltier device to try an make a 12 volt AC
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Re: 12 volt AC

Postby glenn201 » Sat Apr 29, 2017 4:12 pm

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Re: 12 volt AC

Postby glenn201 » Sat Apr 29, 2017 4:14 pm

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Re: 12 volt AC

Postby glenn201 » Sat Apr 29, 2017 4:15 pm

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Re: 12 volt AC

Postby glenn201 » Sat Apr 29, 2017 4:18 pm

[youtube][/youtube]https://www.youtube.com/watch?v=ez9xvO7Ke0s
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Re: 12 volt AC

Postby MtnDon » Sat Apr 29, 2017 5:17 pm

I believe that if Peltier cooling, or TEC, was a great idea for air conditioning we would be able to buy off the shelf units.
Our 6x12 deep vee nose cargo trailer camper conversion... viewtopic.php?f=42&t=58336

We have a small off grid cabin we built ourselves in the NM mountains; small PV solar system; 624 watts PV, Outback CC & inverter/charger ... http://countryplans.com/smf/index.php?topic=2335.0
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Re: 12 volt AC

Postby mustangcats » Sat Apr 29, 2017 9:54 pm

I doubt the results would be satisfactory. They also use a lot of energy. I stated in another thread that the "big boys" would already be making 12 volt air conditioners if such a thing were possible.
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Re: 12 volt AC

Postby Tigris99 » Sat Apr 29, 2017 9:58 pm

Their used in things like electric coolers and such but the size of that's needed to cool a camper is fairly large and would consume far more power than a conventional AC unit.

There is a way to make a 12v AC type device (won't cool near as good as a proper AC unit but be more efficient than one of those). Problem is you have to keep it fed with bags of ice.

But a small window air unit is way over kill for these purposes unless your talking a big cargo trailer conversion.

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Re: 12 volt AC

Postby John61CT » Sun Apr 30, 2017 12:48 am

But if this were used just for dumping excess free solar produced, there may be something useful for it to do. In another thread someone suggested cooling down the battery bnk for longevity.

Not that I would recommend that, just sayin
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Re: 12 volt AC

Postby glenn201 » Sun Apr 30, 2017 7:15 am

I used one of the units in a cooler did a good job dropped cooler from 75 to 44 now im playing with bigger heat sinks an a better fan waiting on more ebay parts
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Re: 12 volt AC

Postby glenn201 » Sun Apr 30, 2017 7:26 am

the unit in the pic pulls 120 watts
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Re: 12 volt AC

Postby Socal Tom » Sun Apr 30, 2017 7:45 am

It takes 3k to 5k btu to cool a TD 30 degrees. That's 1000 to 1500 watts, assuming 100% efficiency.
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Re: 12 volt AC

Postby glenn201 » Sun Apr 30, 2017 10:07 am

if any thing it will make a good cooler I just love tinkering with stuff thats how i ended up building my little camper Image
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Re: 12 volt AC

Postby Tigris99 » Sun Apr 30, 2017 11:49 am

Socal Tom wrote:It takes 3k to 5k btu to cool a TD 30 degrees. That's 1000 to 1500 watts, assuming 100% efficiency.
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A 6000 btu AC unit pulls about 600 watts average.

To be effective that TEC would need to be damn big lol. Already talking a 10amp draw on that small unit ( which the 4 fans draw little of).

Fun project, be good to use to make a "fridge" or something to blow cool air on you (mount it blowing down on your head whole your sleeping).

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Re: 12 volt AC

Postby MtnDon » Sun Apr 30, 2017 12:30 pm

The efficiency of the peltier devices is about 15% IIRC. That may be fine if one has unlimited electricity. That is not the case when batteries are included.
Our 6x12 deep vee nose cargo trailer camper conversion... viewtopic.php?f=42&t=58336

We have a small off grid cabin we built ourselves in the NM mountains; small PV solar system; 624 watts PV, Outback CC & inverter/charger ... http://countryplans.com/smf/index.php?topic=2335.0
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