Just thought I'd share a little money saving tip
If you're on a pretty tight conversion budget like me, and need a bunch of really think cables for your power system, check out E30 BMW's ( which includes all 1982-1994 3 series) in your local junk yard. They're pretty common, and they all had their battery mounted in the trunk. This makes them a great source of loooong 0 gauge cables that can be used for wiring up battery banks, inverters, etc. Plus most places charge a flat rate for battery cables, so when I went today, I got 22 feet of 0 gauge cable (two cars worth) for under 8 bucks before tax. Not bad at all! 3-series of different vintages and some 5-series also have trunk mounted batteries, but I find that the routing makes it a bit more difficult to get them out.
Here's a picture comparing the cable I pulled to a piece of 4 gauge "welding grade" wire I scavenged from a jumper box.