The number one reason I like the Peltier is simplicity and cost.
Even if I went the route of an extremely efficient compressor refirgerator, I would keep the option of the Peltier unit as a backup.
I have no interest in having ice, ice cream or long-frozen meats.
On the Peltier . . . I run it 24/7 now(in dock), but in the past I always ran it a few hours here and there . . . at night and early morning. A total of about 8 hours a day and it served me well during the summer(Ohio).
AND . . . I can have ALL THE REPAIR PARTS hidden in the recesses of my boat for less than $30, just in case. TRY THAT WITH A COMPRESSOR UNIT!
John Francis
Newport 28
On Thu, Oct 18, 2012 at 8:19 AM, happycamperx64 <no_reply@yahoogroups.com> wrote:
Hi Craig,
You've probably thought of this before, but I'm thinking that since one of the peltier's big issues is how to dissipate the waste heat, and since a boat is sitting in water, that maybe a peltier's hot plate could be formed into the external hull of a boat. This might be too scary for an ocean going sailboat, but for a small lake and river boat it might be a way to get the efficiency up while keeping the small size and the low maintenance.
Either way, I applaud your big fridge.
John
--- In electricboats@yahoogroups.com, Craig Carmichael <craig@...> wrote:
>
> That's quite interesting. The internet is sure great for finding out
> about new things you've never heard of before!
>
> I guess it's my electronics background (and dislike of
> compressor/fridge noise) that lead me instead to the Peltier idea. I
> did realize I was going for simplicity at the cost of operating
> efficiency. It would be a considerable learning curve for me to do a
> compressor based system unless they're made as ready to install
> units. Basically, I wouldn't have taken the project on. (For
> efficiency I'd like to try the magnetic refrigeration idea, because
> it's pretty much unexplored and potentially pretty quiet.)
>
> Let's see, to make my Peltier cooling unit "from scratch" (without
> all the detours I took doing a first prototype) would have cost...
> 15 - Peltier device
> 5 - fan
> 10 - Al to make heatsink
> 10 - Al for inner chest
> --
> Well, allowing for whatever, call it 50-75$ or so?
>
> So... any idea what a small 12v compressor based cooling (or heating)
> unit might cost to put together? I looked for compressor based
> ductless heat pumps recently, and under "ordering" they all (large or
> small) link to "find an installer near you", which seems discouraging
> for a DIYer.
>
> Craig
>
> =====
>
> >In regards to refrigeration, lots of people have made their own.
> >There are some very efficient DC compressors out there to employ in
> >this. 12 to 24 volt BLDC compressors are available that can be used
> >in just about any size refrigerator/ freezer. Commercially available
> >ones are usually around 14 cubic feet. These refrigerators will run
> >24/7/365 off of any 150 watt solar panel and matching battery.
> >Current consumption at 12 volts is only around 2.4 amps at full load.
> >In a well insulated enclosure these would be much more efficient
> >than a junction device. And they are available for alternative/HC
> >refrigerants as well.
> >More info below,
> >
> ><http://www.danfoss.com/Products/Categories/Group/RA/Compressors/Direct-Current-Compressors/b44e7573-473b-4dba-90c2-431ffccf0b9c.html>http://www.danfoss.com/Products/Categories/Group/RA/Compressors/Direct-Current-Compressors/b44e7573-473b-4dba-90c2-431ffccf0b9c.html
> >
> ><http://www.masterflux.com/products/cascade/>http://www.masterflux.com/products/cascade/
> >
> >--- In
> ><mailto:electricboats%40yahoogroups.com>electricboats@yahoogroups.com,
> >Craig Carmichael <craig@> wrote:
> >>
> >> Thanks for the responses!
> >>
> >SNIP
> >I'm really in this to create renewable energy things myself*,
> >
> >SNIP
> >>
> >> Cheers,
> >> Craig
> >>
> >> * As an example of how one thing can lead to others... people told me
> >> that Peltier elements were too inefficient for anything more than a
> >> small camping cooler -- not worth thinking about for a fridge. If I'd
> >> taken that advise, nothing would have been achieved. But here's three
> >> things that have arisen from the experiment:
> >>
> >> -- I'm the only person I know who has ever made a home made fridge.
> >> It does use 1/2 as much electricity for only 1/3 the cubic space of
> >> my regular fridge in spite of 3" of foam insulation - but it works
> >> and it's 12 volts. And with a freezing/melting ice chest to store and
> >> release coldness, plus when I've done the "smart control", it'll run
> >> mainly in the day when the solar panels are making the electricity.
> >> If I hadn't explored it, the ideas for making it practical and for
> >> reducing battery energy storage requirements to run a fridge wouldn't
> >> have come to light.
> >
> >
>
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