- 1). Consider using several smaller-wattage solar cells and soldering them in series with each other to create enough power, if your toy required relatively high voltage to operate on batteries.
- 2). Plug a solar charge controller in between your solar cells and the toy's battery inputs, to avoid overpowering your toy's circuits and potentially damaging it. Most websites where you can purchase solar cells also have a calculator to help you decide what size solar charge controller to purchase.
- 3). Mount your solar cells to a flat, skyward-facing mounting surface on the top of your toy using the double-sided adhesive tape. The surface could be a flat piece of wood or plastic. Avoid metal or any other material that could potentially overheat in the direct sunlight, which your toy will need to operate. Since your delicate solar cells will be exposed to the elements by necessity, try to avoid abusing them; dirt, debris and rough edges can damage the solar cells.
- 4). Connect the solar cell's output leads to the power inputs in your toy's battery casing, making sure to follow the pre-existing positive-negative guidelines. For maximum aesthetic effect, try threading the power wires from the solar cells through the toy's outer shell---via an antenna hole, for example---before connecting them to the power inputs, to avoid having wires all over the place.