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Old 04-08-2021, 12:31 PM   #1
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Default 2700 SE water heater and fridge draw

Does anyone know the power consumption of the fridge and the water heater?

Iím trying to figure out how much solar power I need for the fridge and what size generator I need for the water heater.

Thanks 😊
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Old 04-08-2021, 02:06 PM   #2
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I have a de0051 on my 2700 and found this on another forum for you.

"my boat is equipped with a Norcold DE0051 refrigerator, which draws approx 3 amps.
but because of the 12v rv refridgerators being able to kill a battery within a few hours, I have been leary about using the fridge on our boat, even though the de0051 uses a danfoss compresser, as opposed to the rv units using a 12v element....

so after purchasing and installing a cheap inductive amp draw meter, I find the fridge uses 1.3 amps when it runs, which is about 50% of the time after its initial cool down... so over a 24hr period, it pulls about 15 amps.
I have then installed a 200watt solar, which on the best day I have seen it delivering 5.8 amps while everything else (including the fridge) was shut off....

the amp meter shows both outgoing amps and incoming amps, so with the fridge running, I was still showing an input of 4+ amps... so i was surprised at how economical the norcold unit is. it has 5 coldness settings and we run it on 4, which cools the interior down to about 35-36 degrees... on 5 it will freeze everything in the fridge."
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Old 04-08-2021, 04:19 PM   #3
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Typical 6-gal water heater draws ~12.5 amps.
Converting to watts (@120v) is about 1500 watts.
So even a small Honda eu2000 Or equivalent will handle the load (that’s what I use)
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Old 04-08-2021, 05:50 PM   #4
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Thanks guys, really appreciate the advice. Youíve both answered my questions so happy to go with that. I reckon Iíll always be in a power deficit with the solar but Iíll only ever be away from shore for 24 hours at most. Engine will help keep it topped up too. 👍
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Old 04-08-2021, 06:50 PM   #5
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Quote:
Originally Posted by Gleebitz View Post
Thanks guys, really appreciate the advice. Youíve both answered my questions so happy to go with that. I reckon Iíll always be in a power deficit with the solar but Iíll only ever be away from shore for 24 hours at most. Engine will help keep it topped up too. 👍
If 24hrs is your average, adding a larger battery bank might just be the trick. I donít rely on solar, only the mains and the small generator, so having reserve capacity in the bank gives me 4-day weekends without much of a problem. I do need a day or so on shore power to bring them all the way back up, but I at least have the option to stay out longer.

With your solar, you can be trickling some power back into the bank, but not needing it to replenish it fully every day.
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Old 04-13-2021, 06:06 PM   #6
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Quote:
Originally Posted by jparsons121 View Post
Typical 6-gal water heater draws ~12.5 amps.
Converting to watts (@120v) is about 1500 watts.
So even a small Honda eu2000 Or equivalent will handle the load (thatís what I use)
Iím running on 240v electrics (British) so that would make it a 3000w draw from the water heater, using the same formula. That seems very high to me. Can that be right?
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Old 04-13-2021, 07:27 PM   #7
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Quote:
Originally Posted by Gleebitz View Post
Iím running on 240v electrics (British) so that would make it a 3000w draw from the water heater, using the same formula. That seems very high to me. Can that be right?
The power (Watts) should be the same, using a higher voltage requires less current.
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Old 04-13-2021, 08:16 PM   #8
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Quote:
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The power (Watts) should be the same, using a higher voltage requires less current.
Yeah it should be the same. Must be the formula idk. My generator runs 1800w continuously so should just about do it. Thanks 👍
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Old 04-14-2021, 12:02 AM   #9
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Quote:
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Yeah it should be the same. Must be the formula idk. My generator runs 1800w continuously so should just about do it. Thanks 👍
Since 240V is twice 120V then the current should be half or 6.25 amps.
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Old 04-14-2021, 11:20 AM   #10
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Since 240V is twice 120V then the current should be half or 6.25 amps.
Exactly..
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Old 11-08-2021, 12:31 PM   #11
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With a marine water heater. You can let it run by AC power or marine engine heat. This equipment only needs minimal power as any excess can disrupt ignition.
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Old 11-08-2021, 04:58 PM   #12
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With a marine water heater. You can let it run by AC power or marine engine heat. This equipment only needs minimal power as any excess can disrupt ignition.
Not sure how AC power can disrupt ignition which is DC power. Not all water heaters come plumbed into the engine cooling lines, mainly on smaller models such as my 2400 SCR.
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