[C320-list] Inverter Installation

[Stephen Cox]

> Is this right?
> I would have thought....
> 
> Assuming you have a 120V outlet at 1200watts, P=VI, so 
> 1200=120 x I, therefore = 10 Amps out of the inverter.
> 
> So it needs at least 10 amps into the inverter, that will 
> convert the DC into AC. Assuming 90% effiecency, then you 
> will need 11 Amps from the battery
> 

You don't get something for nothing.  The wattage is 1200 whether you draw
it at 12v or provide it at 120v.  Given that P=VI and P=1200 watts, then the
current (I) must go up as the voltage (V) goes down. A 1200 watt inverter
will draw 100 amps from a 12 volt supply, not allowing for conversion
losses.  I suspect your 90% efficiency is optimistic too, making for an even
higher draw.

Stephen Cox
Tegwen #1141