I was given a HUGE inverter (3000W cont/6000W peak) and want to make some changes to the truck now. I'd like to add 2 more batteries (CAT 880A) that have the primary purpose of powering the inverter. In addition, I will be adding a second alternator and transferring the batteries to the bed (all 4 under the toolbox). Is there anything specific that I need to be aware of (other than making sure they're wired in parallel with 00 wire)?

 

A single-alt might be a better idea to keep the engine bay uncluttered. (yea..right?) Something in the link below could provide the truck and spare batteries. The second link is to a site that deals in inverter equipment. They could provide better guidance about wire size and length. You should consider some sort of battery isolator.

6G Series High Output Alternator with Extra Heavy Duty Components

Inverters R Us Has the Power You Need

 

Try the DC Power site before u get alternator. They offer 300 amp alts designed for emergency vehicles ! They are reliable and fit in factory location. Clean, easy, practical!

 

I have dual alternator with a third battery. I used a "latching solenoid" to seperate the third battery. I run my inverter off the third battery "unlatched " from the system. Also with the latching relay I can jumpstart myself if needed!

 

I have a similar set up, but with two extra batteries (4 total). I installed the two extra batteries on the passenger side frame rail using two E-series battery boxes. I used 2/0 wire and 300A fuses. The battery isolator I used is a mosfet type (solid state) and will allow jump starting as lenzhotrod's does. My isolator is from Perfect Switch, it is relatively small, not a lot of current leakage and does not need an immense heat sink. My inverter is a 2500W sine wave inverter. I installed a "momentary-on" switch that allows current to flow in "reverse" through the isolator to provide the "jump start" current to the truck. My alternator is a single 250A DCPower unit.