I finished the inverter installation today. I bought some 6 ga. welder cable which was perfect for the job. It's very flexible and easy to route. I mounted the inverter to the outside wall under the new counter as close to the stairwell as possible. The battery compartment is under the steps, so I was able to keep the cables fairly short.
I routed the cables through the sidewall of the counter up next to the outside wall and down along side the door frame. Then I ran them under the last step to the battery compartment. The last step is a thick piece of plywood, so I cut away some of the underside to make a channel for the cables. The only place the cable is visible (besides under the counter) is the short run along the door frame, about 12".
I still have to get a power strip with a long cord. I want to drill a hole in the counter side wall on the opposite end toward the front and mount it on the wall just behind the passenger seat. That's where the Internet modem mounts and is also near the TV cabinet.
