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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Air conditioning

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Tanglefoot
1st Mate

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USA
76 Posts

Initially Posted - 06/02/2006 : 09:47:26

I believe it was Mr. Hopper that has an air conditioner on his boat. Is the battery that we use on the boats enough to pull a small ac unit or are my hopes up in vain!

Tanglefoot

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Leon Sisson
Master Marine Consultant

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USA
1893 Posts

Response Posted - 06/02/2006 : 10:56:05

You can absolutely forget powering any A/C on a boat from batteries. If you do the watt/hour math you'll see the futility. About the smallest window shaker draws maybe 500w (compressor on). So 500w/12v=40a, A new group 27 battery might hold 100ah, but you can only use 50% of that per charge cycle without damaging a flooded cell battery. So 50ah/40a=1hr:15m compressor run time, assuming no efficiency loss between battery and A/C unit. Even with a house bank of two group 27 batteries, you'd still be lucky to get two hours of cooling before having to recharge.

About your only A/C power source choices are shore power or a generator (which would have to be a portable gas generator for boats this small). A Honda EU-2000i can easily power a small A/C (while charging your batteries!

), and I think it can go up to 8hrs on a 1 gal tank of gas. I think there's an external fuel supply option offered, which might allow the EU-2000i to drink from the same large tank as the 4-stroke outboard. I'm winging it here a bit on the above specs, since I don't have the actual numbers in front of me. Anyone who sees it differently should jump in and straighten me out!

-- Leon Sisson

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Tanglefoot
1st Mate

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USA
76 Posts

Response Posted - 06/02/2006 : 11:23:36

That's what I was thinking. Thanks

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takokichi
Captain

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USA
321 Posts

Response Posted - 06/02/2006 : 14:23:01

I can't imagine you'd be too popular with a generator running in the anchorage all night...

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saribella
Captain

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USA
286 Posts

Response Posted - 06/03/2006 : 09:20:35

The larger question..........is AC really neccessary?

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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 06/03/2006 : 12:43:24

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by saribella
 The larger question..........is AC really neccessary?
<hr height="1" noshade id="quote"></blockquote id="quote">
It is where I sail!!!!!! I would guess that we have around 15 boats with AC in our club. None of them are dock RVs, they are all sailed often. We used to use a camper for sleeping with AC but the 25 is such a nice boat to sleep in that it is worth putting AC on it so we don't need a camper. I really doubt I will ever have a boat without AC and a 110 volt refrigerator.

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.