Do you have longer extension power wires for a 12 amp portable system than the wires that came with the unit?

Hey Leigh, We sure do. We have a portable solar extention cord that is 15 feet long. Part number - ZS-HE-15ft-N. Our portable solar systems come with a 16 foot cord that has battery clamps attached to it. These battery clamps are on about a 1 foot cord and they detach leaving the wire from the portable at about 15 feet. We supply a portable extension cord that is 15 feet in length. The wire size is increased to reduce any efficency loss due to the length of the wire. Hope this helps, Jeff

Zamp solar does offer a 15ft 10 gauge extension cable for all their portables. The part number is ZS-HE-15ft-N.

Thank you yes . We love our solar panels. We got them when we got our Airstream.