You have to use a larger gage wire to that distance.
I would suggest to find a way to install the Inverter close to the source.

wrote in message
ps.com...
I have a 1200 watt nominal / 2400 watt peak, power inverter that I
would like to install about 12 feet from the battery that will power
it. My question is what gage wire will I need for a 14 foot run to the
inverter? The unit was supplied with 5 feet of 4 gage. Is 4 gage
really necessary, it seems like overkill to me? Thanks, Mike Howard

mscres wrote:
You have to use a larger gage wire to that distance.
I would suggest to find a way to install the Inverter close to the source.


But not too close if you're running wet cell lead acid batteries; the
fumes during charging are corrosive to electronics. And not in the
engine compartment, as it gets hot (and sometimes wet) in there. That
5' length of wire supplied by the manufacturer sounds about right.

If you're regularly running 200 amps to the inverter you've got at
least 500ah of battery capacity, right?