Radio Shack.. they have all the power goodies, even though they don't sell car stereo parts anymore <img src="/forums/images/graemlins/confused.gif" alt="" /> I would hardwire it to the battery with 14ga. wire and an inline fuse rated at a little above your inverter, because it uses the most juice you will most likely be pulling. Your inverter should have a built in fuse also, so you should be fine if you plug in an electric drill or circular saw <img src="/forums/images/graemlins/wink.gif" alt="" />