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Old 06-23-2016, 08:41 AM   #1
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kwh ?

Our camper uses 25 KWH from Sunday afternoon until Wed evening,about 3 days with nobody there. Only thing on is ref on low and the converter. Just put 2 new batteries in and still the same. Does this sound high? Would it be less if i put a charger on batts and turned the converter off? Thank you
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Old 06-23-2016, 09:13 AM   #2
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25 kwh in 72 hours = approx 3 kw per hour
I'd say put the fridge on propane for a day and see what happens to your consumption , or empty the fridge and turn it off. The 110v side of the fridge will be the larger of the 2 draws.
I'll dig around in my paperwork from over the winter and see what my average was.
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Old 06-24-2016, 09:04 PM   #3
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During the winter, in Crystal River, FL, I used about 28kwh a day over 6 winters. I do use an electric heat pump many mornings and use electric for water heating. I do have double pane windows. I'll add I use almost no propane. We use an electric convection/microwave oven.
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Old 06-24-2016, 09:29 PM   #4
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25kwh........8.3kwh per day

My electric costs $0.15 /kwh

Those 3 days worth would cost me $3.75 (($1.25/day)

Which is roughly what it costs ME to have my 5th wheel plugged in at home

Why do you think it would be lower using a charger and converter off?
AC Power is still needed for charger......
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Old 06-24-2016, 10:41 PM   #5
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Get a kill a watt and use it to check your devices.

8 kw a day for Un attended unit seems high.

Divide by 24 we get 300 watts.

That could be the heater in the fridge as well as converter overhead.

Check converter voltage and if above 13.5 the batteries are cooking.
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Old 06-25-2016, 12:48 PM   #6
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That sounds high if it is indeed just the refer, which uses at most about 0.5 KWH/hour (most are less). What about water heater? That would be a big consumer too. Or maybe a neighbor with an extension cord?

The obvious course of action is to put the fridge on LP and see what changes, but my guess is "not much". Something else is drawing power.
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Old 06-25-2016, 02:51 PM   #7
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That sounds high if it is indeed just the refer, which uses at most about 0.5 KWH/hour (most are less).
Twenty-four hours of .5 kilowatts per hour would be 12 kwh. So you have to consider the duty cycle of the refrigerator.

I have a Norcold 1200 (the kind with two refrigerator and two freezer doors) and have tested it with a Kill-a-Watt. When it had the original Norcold cooling unit, it used 7 kwh/day.

rich6111, if that's the model you have, then that might be your answer. But you'll know for sure only if you put a Kill-a-watt on it yourself for several days.

You also said that nothing else was "on," but was anything else plugged in? Parasitic loads from electronics can be surprisingly high.
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Old 06-25-2016, 05:39 PM   #8
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"You also said that nothing else was "on," but was anything else plugged in? Parasitic loads from electronics can be surprisingly high." #7(oatmeal)


Was water heater off? Was the A/C off, or set point just raised to were it ran with no witnesses. Storage area lights all off?


(Camper??) Make sure the tow break away safety switch hasn't been tampered with. Someone can accidently pull the plunger. The house batteries will energize the trailer brakes continually.


The converter is only a glorified charger, the batteries are not bottomless vessels and amp draw will diminish.


Diverting cost to LP seems like more of a PIA than a solution since LP is generally only 70% efficient.


Happy motoring.
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Old 06-26-2016, 09:18 AM   #9
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Originally Posted by TQ60 View Post
Get a kill a watt and use it to check your devices.

8 kw a day for Un attended unit seems high.

Divide by 24 we get 300 watts.

That could be the heater in the fridge as well as converter overhead.

Check converter voltage and if above 13.5 the batteries are cooking.

TQ60 nailed it!
A fridge set on high, in a closed rig with no a/c, probably sitting in the sun all day, possibly over-stuffed, will hardly ever cycle off/on. It couldn't keep up with the demand so it would draw 300W constantly.
300W x 80hrs = 24kWh


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Old 06-27-2016, 06:47 PM   #10
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A fridge set on high, in a closed rig with no a/c, probably sitting in the sun all day, possibly over-stuffed, will hardly ever cycle off/on.
The OP said "ref on low."

It would help to know what kind of refrigerator it is.
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