installing inverter 2012 freightliner cascadia

Get longer wires. I used welding cables. There flexable and you can get length and size you need.

 

You definitely want the wires as short as possible...so your best option is to find/create access through the side box on which the batteries are.

Look for Wabaso heater lines, AC lines, or other electrical/coolant lines running up under the bunk---there is usually a little space to shove your cables through these existing holes.
I know from experience, if you make the cables too long while hard wiring a 1500 watt inverter...it will not work properly. Constant power trips...etc.

If nothing presents itself, drill a hole...do it nice, and nobody will know it wasn't already there (I've done that too). I WILL HAVE MY COFFEE!!! White Dog don't drink that brown water truckstops try to pass off as coffee

 

In a Century I used to just drill holes in the floor under the bunk and install the inverter in there. Not sure about a Cascadia. I used 2/0 welding cable, 1,850 watt inverter. Oh, make sure to use some kind of rubber grommet, or plastic fittings to keep the cable from rubbing through. I use a battery disconnect switch to the inverter too incase you need to kill the power to it, also a lot of them seem to draw a little power when off, so the switch would guarantee that it is indeed off.
Most coffee makers don't draw much power, kettles and hot shots use more. When ever I'm going to use a microwave or kettle I just leave the truck running at the time. A 1,200 watt load will draw over 100 amps from your truck.

 

I highly recommend going with a pure sine wave inverter. Those cheap ### modified sine waves they sell in truck stops are a complete waste of money.

 

I mounted one in the cab on the wall just behind the drivers seat. Drilled two small holes for each wire just below it straight down to the battery box. Was nice in that I could reach the on/off switch from drivers seat. 2 six foot cables, 1 one foot cable for in line fuse, I think I got it all from the inverter store. It was 2500 watt modified sine wave.

 

It depends what kind of coffee machine, I have esspresso machine in my truck and it can be run only with pure sine inverter. If you have just a simple drip coffee machine, will run on any inverter. The microwave may not run on any invertor. I also have a induction oven in the truck and the thing only runs on pure sine inverter.