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blaczero

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Posted: 09/11/21 07:47am Link  |  Quote  |  Print  |  Notify Moderator

Do they exist?

ktmrfs

Portland, Oregon

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Posted: 09/11/21 09:51am Link  |  Quote  |  Print  |  Notify Moderator

blaczero wrote:

Do they exist?


well, some that are peltier devices do exists, but they really don't do much.

If humidity is high enough that you need a dehumidifier, then you need one that has a compressor, basically they are an AC unit, air goes over the cold coil, water condenses, usually they can pull several gallons of water out in a matter of hours. They peltier devices might get a few ounces out in the same time.


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jkwilson

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Posted: 09/11/21 10:10am Link  |  Quote  |  Print  |  Notify Moderator

It would be a pretty big power consumer to operate from battery power. They are essentially small air conditioners without outside venting.

If you could post more about what you need and why you want a 12V unit, somebody might have some ideas to help you.


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blaczero

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Posted: 09/11/21 10:38am Link  |  Quote  |  Print  |  Notify Moderator

We manage our mouisture in the rig. When we wake up and there is some moisture on the inside of the windows, we know it's too wet inside (and I have sensors showing the % of humidity).

We don't always have moisture on the windows, but my kids are allergic to mold so we manage it very strictly.

Gdetrailer

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Posted: 09/11/21 12:29pm Link  |  Quote  |  Print  |  Notify Moderator

blaczero wrote:

Do they exist?


I am sure there are some out there, but..

Most "12V" items like this are nothing more than toys and will only draw 4oz-8oz (1 cup-1 pint)of water per 24hrs.

Peltier or solid state cooling devices do exist, apply 12V and one side gets cold and the other side gets hot.

The caveat with Peltier devices is they are absolute power hogs and they are quite limited in size and how much cooling (the fins must cool below the ambient air temp without freezing to condense moisture out of the air) you get and are highly dependent on the ambient air temp on how effective they are.

Buy the smallest 120V compressor based dehumdifier you can find and use a inverter, they work better than any battery powered dehumidifiers you will find.

ktmrfs

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Posted: 09/11/21 07:53pm Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

blaczero wrote:

Do they exist?


I am sure there are some out there, but..

Most "12V" items like this are nothing more than toys and will only draw 4oz-8oz (1 cup-1 pint)of water per 24hrs.

Peltier or solid state cooling devices do exist, apply 12V and one side gets cold and the other side gets hot.

The caveat with Peltier devices is they are absolute power hogs and they are quite limited in size and how much cooling (the fins must cool below the ambient air temp without freezing to condense moisture out of the air) you get and are highly dependent on the ambient air temp on how effective they are.

Buy the smallest 120V compressor based dehumdifier you can find and use a inverter, they work better than any battery powered dehumidifiers you will find.


absolutely. And yes, peltier heaters or coolers are very very very inefficient. That's what's used in the inexpensive 12V coolers you can buy. That's also what is used in our truck for the cooled seats. In that case, they actually do work reasonably well, but the back seat passengers definitely hear the noise from the unit and the fan.

Even the smallest 120V dehumidifier will pull 5 gallons or more of water out of the air in less than 24Hours if the humidity is even moderately high and keep windows from fogging, etc.

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