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Old 07-13-2014, 12:30 PM   #11
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Ron, you're only about 20 miles away from their factory if my google maps aren't lying. Just saying it might be nice if a forum member mozied on by there sometime.....lol
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Old 07-13-2014, 03:41 PM   #12
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Maybe your dinette idea, but we'd miss the dining space.
It wouldn't affect the dining space. I meant under the dinette seat on the curb side. In our case all we keep in that space is a bunch of shoes which could find another home.

On the boat that I built and used the Nova Kool components I had exactly the same setup. I just learned to sit on the other side so the cook could access items without me having to move

One things for sure, the climate is heating up and long term I can see a switch to a compressor based system given that solar power is so much cheaper and viable now.

Ron
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Old 07-13-2014, 03:47 PM   #13
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The Nova Kool fridge is also very compact so it doesn't appear that it could be direct replacement in a 5.0 or a 21...
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Old 07-13-2014, 03:59 PM   #14
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The Nova Kool fridge is also very compact so it doesn't appear that it could be direct replacement in a 5.0 or a 21...
Au Contraire, Wayne. They make much larger models as well. None of them have a draw over 5.2 amps:

Nova Kool, refrigerators, freezers, Marine, RV, Truck
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Old 07-13-2014, 04:12 PM   #15
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Drooling over the larger units for sure.



Good reads::


Fridge doesn't seem to be cold enough ...


Not sure why foil over the heat element would help?




How to determine how many amps my residential fridge takes?


Technical thoughts.
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Old 07-13-2014, 04:28 PM   #16
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If that info is considered with the data I saw on the really efficient Whirlpool units, you can install and run a home unit in your RV + the current draw for the inverter for around 10 amps per day.
What does this mean? "amps per day" doesn't make sense, so did you mean
  • 10 amp-hours per day (and if so, is that at 12V or 120V?)
  • 10 amps current, averaged over the day (and again if so, is that at 12V or 120V?)
I don't think 10 amp-hours at 12V to run a home refrigerator is amazing, it's implausible... that's 0.12 kWh/day.

10 amp-hours per day at 120V would be 1.2 kWh/day; for comparison, a mobile unit which takes 5A at 12V and runs half the time would use 720 Wh or 0.72 kWh/day. The smaller mobile unit still wins, in this more plausible scenario.

This is what Whirlpool calls "Industry's Most Energy-Efficient Top Freezer Refrigerator Available":
Whirlpool® 19 cu. ft. ENERGY STAR® qualified Top-freezer Refrigerator
The Energy Guide for this appliance says that it uses 345 kWh/year, or 0.947 kwh/day... meaning that the "10 amp" value must be 10amp-hours per day at 120 volts, which would be about 100 Ah at 12V, while an RV-sized NovaKool will likely run about half that.

I still think it's impressive that such a large refrigerator (18.9 cubic foot) can run on that little power.
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Old 07-13-2014, 04:32 PM   #17
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The Nova Kool literature also shows a very low draw at 24 volts.
Is it less than half of the current draw at 12V? If not, there's no advantage.

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is there a way to provide dual 12 volt batteries in the trailer supplying both 24 volts to the fridge and 12 volts for the other circuits? My very rudimentary understanding of electrical circuits would mean that the batteries would need to be in series to supply the necessary voltage to the fridge and parallel for the other circuits. Can this be done?
You can do this, but the two batteries will end up unequally discharged, so it will work very poorly. You could run a 24-volt battery bank entirely separate from a 12-volt battery, but now you need two separate charging systems. I can't see how this could ever be worthwhile, since fundamentally there's no significant advantage to 24 volt operation.
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Old 07-13-2014, 05:01 PM   #18
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Au Contraire, Wayne. They make much larger models as well. None of them have a draw over 5.2 amps:

Nova Kool, refrigerators, freezers, Marine, RV, Truck
I stand corrected...
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Old 07-13-2014, 05:13 PM   #19
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Is it less than half of the current draw at 12V? If not, there's no advantage.


You can do this, but the two batteries will end up unequally discharged, so it will work very poorly. You could run a 24-volt battery bank entirely separate from a 12-volt battery, but now you need two separate charging systems. I can't see how this could ever be worthwhile, since fundamentally there's no significant advantage to 24 volt operation.
Amperage draw is half that of 12v operation. Their 6.3 cubic foot model draws 2.6 amps on 24vdc. If the Nova Kool technology is better than the amonia based system in the Dometic fridge, can a simple method be devised to make the dual voltages work?
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Old 07-13-2014, 05:31 PM   #20
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Can you use a voltage divider? If the system 24 VDC from the outset, can a charging system be configured to provide the 24 VDC necessary for the batteries and use a voltage divider to provide power to the 12 volt circuits? If the only 12 volt draw are the lights and some electronic devices the 'watts' would minimal. Are there 24 volt solar panels? If under tow what effect would there be on TV charging system? Can you Ohm's law types figure this out?
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