yeah, it's not the compressor start that's the problem, it's the running of the compressor for long periods.
I know changing the wire is the best solution, but it's one heck of a job to change the wire, so I'm looking at other possible options right now.
so, a second battery close to the fridge won't work?
Also, to change the wire, I assume I have to change both positive and negatives, right? If I added another parallel positive line, that probably wouldn't do it, right?