Someone check my math here.

[Aquafbody]

If I have a load of 1,300 watts A.C. @120 volts that would give my 10.86 amps correct?
Secondly, here is where I'm really uncertain, with 10.86 amps A.C. that gives me 119.67 amps D.C.@12 volts?

 

[ExploringNH]

I don't know where you got 119.67, but it is close.
10.86 amps @ 120Vac = 108.6 amps @12Vdc .

To save a step, P=I*E Watts=Amps*Voltage

1300 watts = Amps*12vdc

1300watts/12vdc= Amps

108.33Amps


There may be other conversion losses or factors to consider depending on what this is for, but that is the raw math on it.

 

[Aquafbody]

It's for a solar system for the house. I live out in the sticks and we lose power fairly often. I have a 2500 watt generator for extended blackouts if needed but for the most part 2-2.5 hours on batteries would be all I need. My generator is not a standby nor automatic start, with his transfer switch I'm hoping to have uninterrupted power and not even need to bother with the genny.
http://powerequipment.honda.com/generators/hp2s-universal-transfer-switch