Another good source for battery cables will be any Renewable Energy installer. Large battery banks coupled to solar modules, wind turbines and/or generators are the norm if you live off the power grid. They often buy them in larger quantities and get a better price.

You can use this site to find Renewable Energy professionals:
http://www.nabcep.org/map.cfm?normalFlag=yes

NABCEP is like ASE for Renewable Energy.

I have a 1500 watt, and I have been using 4 guage strand and a 80 amp car amp fuse. Each cable is 8 foot long and I have no trouble.

Another potential source for good information and installation assistance would be a high end car stereo place. With all the current that those hideous boom, boom, hiss systems use, there certainly must be some electrical guru who can help you.... 8)

Me personally: I have a 1500w Cobra which I intend to install shortly. I am going to mount it as close to the battery box as possible, perhaps right behind the driver's seat. Then, I'll run the "house current" wiring to outlets back in the bunk area.

Only 1700 watts is 141amps
um yea i dont think this formula is correct if it was youd need 000 gauge to run your microwave oven better recheck your formula