Originally Posted by tuffr2
Hummm - I never thought about running a 13,500 btu A/C unit with an inverter and battery power. I was conditioned to think you gotta have shore power or a genny. I was hoping maybe to run an 800watt micro wave for 3 to 5 minutes and a TV.
Are you guys sure you can run an A/C unit with just a two battery set-up or are you guys pulling my leg?
And is this what the OP is trying to do?
op said nothing about AC unit. The questuon was about 12 or 6v batteries.
there was another question about running a 13500Btu AC on Battery.
To find current draw add up power consumed and divide by the voltage.
In a pure resistive load that works but in loads with inductive and capacitive reactance, such as a in an AC motor there is a phase relationship so pure resistance formula differs slightly from the actual measured current but you can use power divided by voltage can be used for general applications.
You will see that for the same power consumed current might be 10A @ 120V it is 120A @ 12V for a pure resistive load.
Reactance components are not associated with DC circuits. The resultant vector in AC non pure restistive loads is called Impedance and this is the defacto resistance in AC ccts.
An element is a pure resistive load. An AC motor is not.
An 800w microwave would draw about 6,6A @120v and about 66,6A @12V. TV will depend on size and type. My LED 24 in TV consumes 45W but a CRT TV draws more than 10 times that amount.
there is also a power loss in the inverter itself so that must be considered.
hope this is helpful.