solar panel + regulator + charging circuit (if you admit your electronics this shouldn’t be too hard) + a few batteries to equal about 10-20 amp-hours of charge (in explanation of cloudy living/terrible weather). downside: expensive – $ 100 or more?

run the outline up in the trees. be sure to use thick insulation wire single. rats don’t usually chew up there.

if its low voltage, dug a direct in the earth about 1 ft down, buy some 1/2″ sch40 PVC pipe, run thick insulated water-resistant cable thru the pipe, reinforce all connections, cap both ends. bury the pipe, and now besides an tremor or someone digging there, the wires will not be disturbed. if high voltage (above 24V DC), don’t do this.

or buy a low-cost BB gun, shoot the rats. or several rat traps.