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  #1  
Old 12-16-2008
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Adding electric compressor to engine-run fridge

I have an engine-run compressor and want to add an electric compressor for use when on a mooring. I believe the current system is a seafrost. It is fresh water cooled (using engine coolant). There are 2 holding plates, one in the freezer and one in the fridge. Electricity will not be an issue because of a fourwinds wind generator and the mooring is in a windy place (average wind speed in July is 12 knots).

Is it possible to add a second, electric compressor?

Do I have to worry about isolating the compressors (maybe with a reverse flow preventer) from each other, or can they simply be put in parallel?

Has anybody done this?
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It would be good to keep the milk cold this summer, even when we aren't on the boat.
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Adding a second compressor is going to complicate the setup alot, and create lots of possible points of failure. It might be simpler to have a small electric 12 VDC fridge for the stuff that has to stay aboard. A small Engel would be my suggestion. They're portable. Most are dual voltage, so can run on AC when connected to shorepower or 12 VDC when out on the mooring.
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It was set up that way in another boat I had. BUT, it had two plates with TWO separate feed return systems into each plate. One from the engine and one from the electric compressor. They ran into each plate but separately cooled it. They were not piped together. If one broke the other cooled. I would think you would have to replace the plates or just add a separate 12 volt system with its own plates. call sea frost. I have found them helpful.
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How old is your Seafrost? You might want to junk it and put in a 12v system.
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You could also have additional 12v system inside the same box.
Similar double cooling system is used on my boat:
On fridge with:
1) factory installed 12v simple system - that was left as it was
2) added 220V (over inverter) holding plate with separate compressor and everything.
Yes, it takes more space in the fridge and in the cabinets, but you have full redundancy.
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I don't think you want to use the same system at all. If you want full redundancy with the engine driven system, suggest you just add a complete 12V system with separate plates. If you think your wind gen is going to keep up with it at anchor....think again. It won't even keep up fully with one box. If the engine system is working...suggest you just get a small 12V system for the fridge box and run the engine whenever batteries get low or the freezer needs to be brought back down below 32.
My 52 had a SeaFrost 12V 1/2 HP system but we ran the generator when using that and had a huge battery bank and 130amp charger to keep up with two large boxes like yours.
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Quote:
Originally Posted by Vasco View Post
How old is your Seafrost? You might want to junk it and put in a 12v system.
Year is 2000.

She's a Beneteau 505.
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Originally Posted by camaraderie View Post
I don't think you want to use the same system at all. If you want full redundancy with the engine driven system, suggest you just add a complete 12V system with separate plates. If you think your wind gen is going to keep up with it at anchor....think again. It won't even keep up fully with one box. If the engine system is working...suggest you just get a small 12V system for the fridge box and run the engine whenever batteries get low or the freezer needs to be brought back down below 32.
My 52 had a SeaFrost 12V 1/2 HP system but we ran the generator when using that and had a huge battery bank and 130amp charger to keep up with two large boxes like yours.
I might have to add a couple large solar panels to keep up then. And then I would have diverse (belt-and-suspenders) methods of generating electricity.
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Call Seafrost, Cleve is very helpful.

I'm not sure what you mean by 'electric compressor'? 12 volt? 120 volt?

I have 2 cold plates in my freezer with a spillover to the frig. Boat came with engine driven and shore assist systems. Thinking of adding a 12 volt to the existing setup for longer term anchoring rather than have to run the engine an hour every day.
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