The Solar Engine is used to generate energy to power a Steve's Carts cart by using two dependencies: a direct view of the sky and a high enough light level. This makes it more effective for modular carts intended for such purposes as farming or transport as they will spend more time above ground. This means it is less practical for a cart intended for mining, where a Coal Engine would be more practical.
Can be used if you are going to be using your carts for a tree farm or a wheat farm; they will gain power during the day and then use the storage of power at night.
Compatibility - The Engine works only with a Tiny or Regular Coal Engine on a Standard or higher hull.
Crafting - You need 2 Iron Bars,1 Advanced PCB, 2 Pistons and 4 Solar Panels