Materials

PV panel(s) — minimum of 40-watt panel producing 12 volts (can be within a frame or mounted on the building)

Charge controller

12-volt deep cycle car or marine battery

Wires — what you use depends on the number of panels you have. If you buy a kit, the proper panels are included in the package. (Check solardesigntools.com/wire_calculator.php to calculate the appropriate wire.)

Power inverter — use the highest efficiency that you can afford. Use an inverter if you have an AC light setup. You won’t need one for a DC configuration.)

Clamps to attach solar panels (via the charge controller) to the battery

Low amperage bulb (such as an LED)

Weatherproof (but not airtight) box for the battery