SNIP: Larry wrote: "In the hypothetical example I used, this three volt difference will attempt to push 30 amps through the approximately 40 feet of #12 primary wire connecting the dedicated battery to the main battery/charger. Since the maximum safe current carrying capacity of #12 wire is 20 amps, the feeder wires will heat up. This is probably OK if the high current device is operated for a short period of time and the dedicated battery is fully charged at the outset." REPLY: Larry, why not just run #10 wire which is 30 amp wire? The cost and weight difference between #12 and #10 for 40 feet is not significant. David Sorenson Duluth, MN ____________________________________________________________ Hotel pics, info and virtual tours. Click here to book a hotel online. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTKDEy15R1kIWOmSehtRVfD3DswLRrIwjKmn9TUuilPzyLtwy0wqWE/