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  #981  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by robertluster View Post
Amen. I quite agree.

But I AM very interested in the selection / quantity of foods you have chosen to dry. How much of what do you target before a cruise?
Hi Robert, we used to be a lot more systematic about food planning than we are now. But basically we sketch out menus, and then work backwards to get the amounts or volumes of required ingredients. On the boat we're usually out for four to six weeks at a time, and we cook very much like we do at home. Lot of veggies, rice, pasta, and beans. We carry plenty of fresh stuff: carrots, beets, rutabaga, cabbage, potatoes, onions, garlic, etc.. Lots of harder or root veggies keep a long time without cooling. We do use less meat, but do bring some canned, as well as dried ground beef which is great for stews/soups, and other pot meals. Other than that we bring all sorts of dried fruits and veggies (peppers, tomatoes, mushrooms, zucchini, egg plant, etc.).

We could have a whole discussion about menus and provisions. Perhaps a new thread?
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  #982  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by newhaul View Post
Looks real nice but at just over a grand delivered and that's two years ago price
The units we have been discussing would yes use about double the power but cost under a hundred to build so there's 900 to add to the beer budget for most here
The price sounds great, but the extra power to run it gets me worried (more batteries, more panels). How many amps would you expect to consume to keep a well-insulated small box (say 40 quarts) at below freezing with your system?
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  #983  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by newhaul View Post
Looks real nice but at just over a grand delivered and that's two years ago price
The units we have been discussing would yes use about double the power but cost under a hundred to build so there's 900 to add to the beer budget for most here
Actually a lot less than this if you only need to buy the peltier units... the prices have really come down since the last time I've used them on one of my aerospace projects... So yeah more money for the best solar panels money can buy.
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  #984  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by copacabana View Post
The price sounds great, but the extra power to run it gets me worried (more batteries, more panels). How many amps would you expect to consume to keep a well-insulated small box (say 40 quarts) at below freezing with your system?
Problem is not the price... it's the maintenance issues with these compressor units over time.
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  #985  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by guitarguy56 View Post
Actually a lot less than this if you only need to buy the peltier units... the prices have really come down since the last time I've used them on one of my aerospace projects... So yeah more money for the best solar panels money can buy.
I know it would be less but any lower number and people would get irate and demand cost breakdowns also for mine I was including the addition of a 30watt cheapie used solar panel prelim estimates put me around 5ah per 24 hr period to operate and 30 watt will satisfy that requirement on my system others will vary.
Also my design is to keep dairy in the sweet spot not to freeze stuff
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  #986  
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Re: Voyaging on $500 per month

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Originally Posted by copacabana View Post
The price sounds great, but the extra power to run it gets me worried (more batteries, more panels). How many amps would you expect to consume to keep a well-insulated small box (say 40 quarts) at below freezing with your system?
12v 5 amps are typical for the meduim peltiers, some run lower and the best peltiers run at about 8 amps... but mind you they cycle on/off so it's not a constant 5/8 amps discharging the battery or using the solar panel on 99% duty cycle... that's the beauty of using the peltier units... they are solid state devices and basically will almost run almost forever (100000 hours normal life) try that with a compressor run system... or 11.4 years of run time at 24/7 hours constant use... that of course would never happen as the peltier would run at a given set temp range before it turns on again... that could be 15 minutes per hour to maintain 30 degrees... this assuming your refrig is built efficiently.
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Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by guitarguy56 View Post
Mike while I might agree to a point... the times past is just that... times past.
No one takes a horse to work? No one puts their fingers on a rotary phone anymore... etc. Refrigs offer a convenience and a convenience only... some of us would like dairy products like butter, eggs, produce, etc. and these need to be refrig. at some point... even when camping... some people bring coolers with ice, others choose to bring an Engle/Coleman electric cooler... it's choices... some cruisers want that choice to cool their beers or other items... I sure do and so do many others... others choose not to have anything refrigerated and would rather use dry goods only... I was only hoping to give those wanting a cheap alternative to the compressor type refrig systems wought with maintenance issues...
Quote:
Originally Posted by guitarguy56 View Post
Problem is not the price... it's the maintenance issues with these compressor units over time.
GG,

You really ought to look at the Danfoss 12v compressors, like the Danfoss 50. These are what in SeaFrost's Tradewinds systems. They are near bulletproof -- self-contained with internal lubrication.

I've even bought a used one off eBay and proceeded to use it. You could get one that submerged, for instance. Add a new controller and away you go.



Regards,
Brad
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  #988  
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Re: Voyaging on $500 per month

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Originally Posted by newhaul View Post
I know it would be less but any lower number and people would get irate and demand cost breakdowns also for mine I was including the addition of a 30watt cheapie used solar panel prelim estimates put me around 5ah per 24 hr period to operate and 30 watt will satisfy that requirement on my system others will vary.
Also my design is to keep dairy in the sweet spot not to freeze stuff
Colemans largest electric 40 qt. cooler works on 9.5-14V @ 4 amps... it uses one peltier unit and cools down 40 deg below ambient temperatures... it uses a fan to remove the heat... now imagine the fan removed and having water to cool the peltier?

Last edited by guitarguy56; 02-13-2014 at 01:33 PM.
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  #989  
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Re: Voyaging on $500 per month

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Originally Posted by Bene505 View Post
GG,

You really ought to look at the Danfoss 12v compressors, like the Danfoss 50. These are what in SeaFrost's Tradewinds systems. They are near bulletproof -- self-contained with internal lubrication.

I've even bought a used one off eBay and proceeded to use it. You could get one that submerged, for instance. Add a new controller and away you go.

Regards,
Brad
Brad... I've seen those and believe they have a use on larger boats you can isolate the noise in some insulated compartment... I just believe the simpler the system the less the headaches later on (the peltiers can be completely submerged too)... I would hate it for my refrig system to bunk out on me somewhere in the mid Atlantic/Pacific when temps are at about 90-100 degs F and my wife's medication has turned to mush...

How long have you had your Danfoss running without an issue?
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  #990  
Old 02-13-2014
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Re: Voyaging on $500 per month

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Originally Posted by guitarguy56 View Post
Colemans largest electric 40 qt. cooler works on 9.5-14V @ 4 amps... it uses one peltier unit and cools down 40 deg below ambient temperatures... it uses a fan to remove the heat... now imagine the fan removed and having water to cool the peltier?
Exactly and I also am looking at a low voltage thermosta to keep the temp in the upper thirtys in the fridge so I'm estimating on a twenty four hour time frame. And approximately fifteen percent duty cycle ie: 10 min on per hour
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