If your talking about a mains extension cord then thats your problem. I once tried this in my early car audio days to run an amp, then thought "wow my amp distorts really early and is not at all loud". Then I replaced the crappy mains cable with proper gauge power cables and it was like getting a new system!
Originally posted by jrbless
To get power to it, I cut up a 10 foot (3 meter) extension cord. One end of it is wired in the fuse box for the fan/ac unit on a 30 Amp fuse (way more than what's needed). The other end of it connects to the Sproggy. Is this an amperage problem due to the extension cord wires being too small (I think they're 16 guage wire, but not sure).