Do the math for me...

[eric1514]

...and then tell me how you did it.

I have an appliance that is rated 130 watts at 110 volts (house current). How many amps per hour will this appliance draw from a 12 volt battery?

TIA
Eric

[time2roll]

130w 110v resistive load might still draw 1 or 2 amps from a 12v battery.

[Almot]

allen8106 wrote:
Wrong...It's 130 ÷ 110 = 1.18 amps

The question was "from 12V battery". Therefore, about 12-13 amps with inverter losses.

Hooked up straight to 12V, AC appliance will draw nothing, of course 🙂

[_40Fan]

0. Plug it into 110.

[Kayteg1]

Since you are running 120V appliance from 12v battery, you will need inverter.
Depends on quality, those will take additional +- 10%
As you can see those can be only approximate numbers.
We don't know if the voltage is 120 or 110 volts.
Nor 12 or 12.5 volts

[allen8106]

smkettner wrote:
130 ÷ 10 = 13 amps

Wrong...It's 130 ÷ 110 = 1.18 amps

[eric1514]

Thanks to all!

Eric

[time2roll]

130 ÷ 10 = 13 amps

[red31]

130.000 watts / 12.0000 volts yields amps, you do the math.
divide by .8 or .9 for inverter effiency

[2oldman]

130w /110 = 1.18 amps (Rule: Watts= amps x volts)

Battery draw at 12v is approx. 10x what the 110v side draws, therefore, 10x 1.18=11.8 amps. (Rule: watts are conserved. Voltage is 1/10 of 120, so amps must be 10x)

And it's not "amps per hour", it's just amps. If you ran it for one hour, that's 11.8 amp-hours.