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Old 01-10-2016, 07:51 PM   #1
Winnebago Owners Club
Join Date: Sep 2014
Posts: 90
Dimensions control panel display

Just have an amp question. Display is showing as charger float mode 13.3 volts, 10 amp. The manual states that this indicates it is in the third stage of the charging process and indicates the battery voltage and the amount of DC charge current flowing into the batteries. I am trying to learn a bit about AC vs DC and how that relates to amps. When it says DC charge current, I assume that is not the same as AC current. Bottom line is I'm trying to figure out how many amps are being used of AC when it says it's using 10 amps of DC current. Trying to estimate amps we are using in given scenarios so need to know how much the inverter is using in this charge/standby mode.

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Old 01-10-2016, 08:05 PM   #2
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Holiday Rambler Owners Club
Join Date: Aug 2015
Posts: 3,064

My electrical engineering classes are far in the past, but I can dredge up enough to remember this equation:

P = V * I

power = voltage * amperage

Assuming no significant power loss across the device (not realistic, but close enough), P (in) = P (out), so that:

I (in) = I (out) * V (out) /V (in)

For your example:

I (in) = 10A * (12V/120V) = 1A

All things being equal, the current on the 120V side will be 1/10 of the current of the output side.

For extra credit, let's see what your inverter has to put out to supply a 1200 watt microwave (or Keurig!):

1200 watts at 120 volts = 10 A
1200 watts at 12 volts = 100A

No wonder the cables between the batteries and the inverter have to be short, fat, and well-fused!

2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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Old 01-10-2016, 08:18 PM   #3
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Tiffin Owners Club
Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,847
There is also a effeciency factor. Your inverter loses about 10%.

So you might see 100watts of AC power required to generate 90 watts of DC.

I suggest one of these two methods.

Buy a energy meter, about $30. They are 110v, so you need to power your coach from a 20amp circuit.
Brand name is Kill A Watt meter

Also, look at your electric meter, without the coach, and then with. Just dont turn anything in the house on.


2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2014 Jeep Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -South Orange County Ca.
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Old 01-10-2016, 08:36 PM   #4
Winnebago Owners Club
Join Date: Sep 2014
Posts: 90
Thanks guys. There's a reason I was not an electrician or a mathematician!! My brain is swimming. I read some articles today with these formulas...
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