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Old 05-12-2017, 15:56   #16
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Re: BD50 compressor for a 80 liter freezer/fridge combo - is it overkill

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Originally Posted by KWISPEL View Post
This one have a little fan in it, so have you a good circulation from the cold air in the fridge. Works very well.

https://www.svb24.com/en/dometic-vd-...vaporator.html
Enclosed Fan Convection Evaporators work well in a cooler are not practical in refrigerators or freezers without automatic defrosting.
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Old 05-12-2017, 16:25   #17
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BD50 compressor for a 80 liter freezer/fridge combo - is it overkill

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Originally Posted by OzePete View Post
Provided the BD50 is matched to the system then the daily power consumption will be much the same as a system with a BD35 matched to it. A system with a smaller compressor may have a lower hourly consumption rate but it has to run proportionately longer to perform the same task so its half a dozen of one and six of the other.

Believing a BD35 uses less power because it is rated at 3.0A is not correct. Go for the BD50 and your system will have a bit of grunt for coping with extreme conditions.

Cheers OzePete Ozefridge | 12 Volt Refrigeration Systems


While I am only a licensed tech myself and donít have any real credentials, this post is the answer, in my opinion.
If your cooling capacity exceeds normal demands, no problem, the compressor just cycles off.
However if not a little oversized, the day you toss in a case of warm beer or a few kilos of steaks to freeze, itís going to bust a gut for maybe days to get back to equilibrium, while a little oversized system will shrug it off and be back to set temps by morning.

PS, my system is a BD80
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Old 06-12-2017, 06:21   #18
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Re: BD50 compressor for a 80 liter freezer/fridge combo - is it overkill

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Originally Posted by ColdEh Marine View Post
For a 2.8 cubic foot box or there about . A BD50 would be large . But that really depends on your insulation and your intended cruising grounds . If you have just 2 inches of good foam or R10 insulation you could probably go with a BD35 . The smaller compressor would be more efficient in this case , as it would cycle less . On a thin plate capillary tube system it is essential to match the box to the systems capacity for maximum efficiency. Your goal would be a 50% duty cycle of the compressor . Remember a compressor that cycles on and off to often wastes energy .

Regards John
Hi John, thank you for the help. How much % of waste can you think of because of the more cycles?
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Old 06-12-2017, 06:56   #19
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Re: BD50 compressor for a 80 liter freezer/fridge combo - is it overkill

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Hi John, thank you for the help. How much % of waste can you think of because of the more cycles?
Thats hard to say without knowing how good your insulation is . The fact is you have a small box therefore you would have to use a small evaporator plate . Such a small plate will be very rapidly cooled off by a larger compressor then in turn turning off the compressor very quickly . What I would do is get a BD35 , get the largest plate you can to fit your box , see how that works out , if you want better performance , insulated where you can nondestructively until you get your desired results .

The best way to go would be to remove the liner and old insulation , re-insulate the box , build a new liner , install a BD35 , enjoy energy efficient refrigeration for years to come. Again always comes down to what you want to do with your boat and how long you intend to keep this boat. And of course your energy generating capabilities.

Regards John.
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