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Buick-Deere, et. al. follow up battery-inverter

J

JDemaris

Well-known Member
This is a follow up after my last post about using a small AC refrigerator with twin 6 volt batteries and an inverter - in a small motorhome.

After screwing around with the math projections, I hooked it up and tried it.
Seems to work well, so I'm installing it.

Hooked to two batteries - deep cycle 6 volt 225 AH with inverter. One slight variable is that the fridge draws slightly more amps via the mod-wave power, but only by a small amount.

Ran it for a little over 24 hours which is more than I'll ever need. Basically will only need it at night when we're sleeping and not driving. Otherwise, the alternator will run it.

1:15 PM battery voltage 12.97 100% charge

10:30 PM battery voltage 12.22 VDC 60% charge

8:15 AM (next day) battery voltage 12.09 VDC 49% charge

1:45 PM battery voltage 11.94 38% charge

3:15 PM battery volage 11.9 38% charge

Read-out when at 24 hours and 30 minutes use showed .43 KWH was used (430 watt hours)
 
Thanks for the followup.
While in the ballpark my estimate of 3+ days was overly generous at 6 minutes per hour usage.
The 30 minutes per hour usage rate was closer.
As well well know, even a deep cycle battery should be taken below 2/3's capacity.

I try to explain to these "green energy" people that we can not run the country on "batteries" when the wind turbines are not turning. Or at night when the solar cells don't work.

Our hunting out fitter is kicking around the idea of electric fridges in the remote flyin only camps. It will save weight flying 40lbs of LP per week for lights and cooling.
 
Hey B&D,

What you might consider doing is hauling in some 4ftx8ftx2" styrofoam sheets to a make a refer box and door.

Use a 12vdc CPU cooling fan, about 480cfm @ 0.3ahr, at a bottom entry point with a top discharge, on a standard refer cold control. Depending on your day time ambient, don't run the fan during the day time, only at night and you would be able to keep your homemade refer box below 40ºf at night

Chilled water is another option if you have a steam/lake near by. Hear just use a heater exchanger coil out of any auto/truck application with a 12vdc RV pump.

It's the mullion heaters that draws a huge amount of power on a standard refer.

T_Bone
 
Don't sound real bad was the refrigerator already cold before this test?

I always plugged in mine a day before a trip to 120V and less battery usage because it was just working as a maintenance thing as long as the door stayed shut.
 
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