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Identifying Power Draws

So I am camped out at a dog show for four days.  My plan was to run the generator during the day and run off battery at night.  As soon as I turned off the generator (and started running the inverter)....I noticed a huge power draw.  Even with mostly everything turned off, I was still drawing 50 amps!  My batteries are near the end of their life, but with draws like these, I won't last an hour!

The Aquahot was not running, nor was the fridge.  So I am off to try and identify what is drawing all that power.

While I was looking, the 120V compressor kicked on.  It was pulling 30amps.  (The inverter said the draw was 13 amps before it turned on and 43 amps after it turned on).  How can that be?  I looked up the Thomas air compressor and the specs call for something like 5 amps.

So...Does anyone have insight into looking at the power pulls in their coach?   My first thought is to get my clamp on ammeter and try to read the wires in the breaker box next to the inverter.

Bill Johnson
2003 Newell #653 Quad Slide Cat C-12 engine with Motorcycle lift 
2011 Jeep Wrangler, 2018 BMW 1200GS Adventure Motorcycle
Auburn, Alabama
A quick way to narrow it down if you don't have a clamp on ammeter is to switch the breakers off one by one and find which circuit the huge current draw is on. Then you can just focus on whatever that circuit feeds.
Michael Day
1992 Newell 43.5' #281
When dry camping i turn off both the 120v water pump and the 120v compressor. The water pump is an energy hog.
Richard and Rhonda Entrekin
99 Newell, 512
Subaru Outback Toad
Inverness, FL (when we're home Cool )
The 120vac compressor pulling 30 amps, is that 30 amps of 12vdc? That sounds about right, 5 amps at 120vac would be about 30 amps at 12vdc.
But why do you need the 120vac compressor running, won't the 12vdc compressor provide enough air for the slide seals, toilet, etc?
Also if you do use the fridge then turn off the ice maker.
Lithium Baby!!
Forest & Cindy Olivier
1999 Foretravel 36' U320
former 1998 Newell 45' 2 slide #486 

former 1993 Newell 39' #337 
2011 Chevy Tahoe 

2010 Silverado w/ RZR 570LE
Is the front batteries that start the Perkins diesel for generator charged by the rear engine alternator?
I have had two newells. One started the gen off house batteries anf the other started off chassis batteries
Richard and Rhonda Entrekin
99 Newell, 512
Subaru Outback Toad
Inverness, FL (when we're home Cool )
My 92 starts off the house batteries.
Michael Day
1992 Newell 43.5' #281

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