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Old 19-03-2012, 17:28   #91
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Re: Cooling the Cabin of a Sailboat

Watts are watts. Regardless of voltage. If you have a 1200 watt unit, it needs 1200 watts per hour. A 100w solar panel can generate 100w per hour. You'd need about 12 of them to even hope to come close. Also 7.7amps out of a 100w panel is very very optimistic.
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Old 19-03-2012, 17:29   #92
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Re: Cooling the Cabin of a Sailboat

Wow, came to this thread and saw the first post only and commented. After the comment it dropped me on page 6 of the replies. Oops! Sorry if I just went over already covered ground.
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Old 19-03-2012, 17:33   #93
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Re: Cooling the Cabin of a Sailboat

A typical 12k btu AC will be around 12amps running at 115 VAC, thats 1380 Watts. Now you can look at your 100 watt panel in a different light.
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Old 19-03-2012, 17:55   #94
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Re: Cooling the Cabin of a Sailboat

Ive installed auto and truck ACs in both power and sail boat over the yrs. A large truck compressor system installed on a 35 t0 45 ft boat will cool the main cabin, and or the sleeping cabin very well if the engine is running, a couple of these sysyems have been working down here in Louisiana for a couple of yrs now and work well !!also a small Honda genny will run a pretty big window type AC, and will keep ya way cool enough to sleep anyway !! Swamp coolers as used in the dry air areas of the world, just won't work in the high Humidity areas!! Period! you might as well jump in the water and stand in front of a fan !! just my 2 cents !!
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Old 19-03-2012, 17:58   #95
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Re: Cooling the Cabin of a Sailboat

Yeah, you're missing something. Power is measured in watts, not amps. Amps does not take into consideration that the AC unit is running on 117 volts, and the solar panels are putting out a nominal 12 volts.

Watts is watts, it takes into consideration both voltage and amperage.
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Old 19-03-2012, 19:01   #96
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Re: Cooling the Cabin of a Sailboat

OK, that makes more sense. I thought I was doing something wrong.
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Old 19-03-2012, 19:04   #97
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Re: Cooling the Cabin of a Sailboat

The mist and swamp/evap coolers would have the benefit of providing a nice sideline business as sea water has about 3% salt in it. All of the salt will be left on the misted deck or inside the swamp/evap coolers matt.

In a gallon that's about 1/4 oz. Which would add up quickly.
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Old 19-03-2012, 19:49   #98
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Re: Cooling the Cabin of a Sailboat

Quote:
Originally Posted by Target9000 View Post
Watts are watts. Regardless of voltage. If you have a 1200 watt unit, it needs 1200 watts per hour. A 100w solar panel can generate 100w per hour. You'd need about 12 of them to even hope to come close. Also 7.7amps out of a 100w panel is very very optimistic.
Watts per hour is a nonsense unit.
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Old 20-03-2012, 16:18   #99
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Re: Cooling the Cabin of a Sailboat

i have a formosa 41 and use a 5000btu unit and place into one of my needing to rebed windows built into the boat....is only good thing they are for--air conditioning units.... a fan to blow cool air into other rooms on board is helpful also.

i have 10 degrees cooler inside due to my use of tarping to reduce the heat inside boat--sun doesnt bake my topsides....
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Old 20-03-2012, 16:39   #100
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Re: Cooling the Cabin of a Sailboat

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Originally Posted by Target9000 View Post
Watts are watts. Regardless of voltage. If you have a 1200 watt unit, it needs 1200 watts per hour. A 100w solar panel can generate 100w per hour. You'd need about 12 of them to even hope to come close. Also 7.7amps out of a 100w panel is very very optimistic.
1200 watt unit, needs 1200 watts to run. Hours have nothing to do with it. To run a 1200 watt unit for an hour, needs energy source that is able to provide at least 1200 watts for an hour.

100w solar panel generates continues 100w, not per the hour.
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Old 22-08-2012, 15:51   #101
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Re: Cooling the Cabin of a Sailboat

Not sure i follow "screw" to hatch? Can you explain further?

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