"Jim749293432" wrote in message
...
Eisboch wrote:

wrote in message
...
On Jan 29, 8:24 pm, "Eisboch" wrote:
wrote in message

...

If you have a small cabin on a boat can you get a small heat exchanger
that heats in winter and cools in summer that runs on 12 volts? What
kind of system would you use?

No.

Eisboch

So how do they air condition boats and campers?

My smart ass answer was because you said "runs on 12 volts". You would
have to have a battery bank the size of the boat to have enough amp
capacity to run a heater or air conditioner for very long. A small AC
unit will draw roughly 8 amps at 120 volts, so figure more than 10 times
that using a 12 volt compressor (if they made one) or running it from a
12vdc to 120vac inverter.

Generating enough heat BTU's would be a similar current draw. 12 volts
is simply unrealistic.

Air conditioners on boats or campers run from either 120 volts and in
rare cases, 220 volts.
The power is supplied from a genset or shore power.

Campers usually have either a heat strip in the AC unit and/or propane
heating systems.

Eisboch


Heat pumps too.


Forgot that. Reverse cycle combination AC and Heat. But not for 12vdc.

Eisboch