12V refrig units and power - Page 2 - SailNet Community
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post #11 of 55 Old 07-30-2014
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Re: 12V refrig units and power

I have a small freezer box at the top of a large well insulated top loading fridge. Makes ice in 95f ambient..

Adler Barbor Super Cold Machine air cooled.

I have 400 watts of tiltable solar feeding 6 golf cart batts.

Most days I am fully charged by mid day.
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post #12 of 55 Old 07-30-2014
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Re: 12V refrig units and power

Your ice box insulation could make a huge difference in the energy required to maintain temperature. Before we added refrigeration, we went to Maine in the company of an older Morgan 34. These folks used literally 10 times the ice we used in our boat over a two week period.

These folks bought bulk ice at a commercial dock and had a strategy for recycling the melt water--but that's another story.

Since then, we've added an Isotherm refrigeration system with a thru-hull fitting that contains an in-water heat exchanger. It has proven to be a very energy-efficient setup. Normal engine operation (60+ minutes/day) is sufficient to keep the battery bank sufficiently charged when cruising.
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post #13 of 55 Old 07-31-2014
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Re: 12V refrig units and power

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We are based out of Port Washington LI. We have a Honda 2000 onboard but have yet to use it
I am in Stamford - practically neighbors.
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post #14 of 55 Old 07-31-2014
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Re: 12V refrig units and power

I have a 12V cooler powered by battery and solar panel. Need it to store my insulin :-(
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post #15 of 55 Old 08-01-2014
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Re: 12V refrig units and power

I'm currently running a 12v only 27 year old unit that is air cooled (perhaps the most inefficient setup possible). I've got 280w of solar panels running through a MPPT controller and a Victon BMV600S monitor to tell me watts watt.
On hot days (over 90) I need around 75ah to satisfy the fridge, it's on the list for a air/keel replacement next haul out.
My panels keep up the draw (about 110 on average daily) quiet easily, more often than not I'm showing 95% by early afternoon.

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post #16 of 55 Old 08-01-2014
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Re: 12V refrig units and power

We I replaced our refrigeration with wate cooled aldar barbour supercold5 years ago i took the oppertunity to blow foam isulation aorund the exhisting box. The average daily ah draw dropped from 48 to 22.

iNSULATION IS SO VERY IMPORTANT
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post #17 of 55 Old 08-05-2014
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Re: 12V refrig units and power

I use a Domatic cooler/freezer, it can be used as a deep freeze or cooler. For the summer I set it to 0 C (32 F) and leave it on all the time. I have two 100 ah batteries and a 64 watt (10 year old) solar panel. Two years now and never had a problem. A bonus is that because it runs on 12 or 24 vdc or 120vac I take it home and plug it in and set it for minus 18 C (0 F) and have an energy efficient extra deep freeze for the winter.

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post #18 of 55 Old 08-06-2014
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Re: 12V refrig units and power

We have a very large freezer with spillover to a refer. 280 watts of solar and an Air Breeze wind gen.

Currently in the cold waters of Maine we're almost always 90% state of charge or higher. Even on cloudy windless days. But in Florida in the winter we need to run the gennie every 3 to 5 days to assist charging.

I did add a bunch of insulation which helped a lot but warm water and warm air temps make a big diff.
BTW, solar does a lot more overall than wind gens.
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post #19 of 55 Old 08-09-2014
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Re: 12V refrig units and power

Engel has very efficient drop-in units. I'm planning to purchase one of these to replace my un-insulated ice-box, and power it with two 12v G27s, each fed by it's own 100Watt panel and WPM charge controller. I may add more batteries, or bigger batteries, at a later date, but other than lights (which will eventually all be LEDs) and fans, there is little other power consumption.

My previous boat had a similar setup, but aided by a wind generator for those stormy days that keep the sun hidden.
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post #20 of 55 Old 08-09-2014
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Re: 12V refrig units and power

I'd be curious to see photos of smaller boats with large panels on them. A fridge could be handy, but the requirement to plug in makes it far less appealing. The 30w panel on my 28' boat already is large, I can't imagine finding room for 250w worth of panels.

Dave_E: We've always had an easy time finding ice on the Salish Sea, so a fridge conversion hasn't been a major consideration. Our icebox is well insulated and we can go 4-6 days on 2 blocks of ice (4 days if one is half melted when we start, 6 if both are intact).

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