The ingredients you need to make a solar cell in Little Alchemy 2 are:
1. Sun + Energy
2. Life + Radio
3. Battery + Light
4. Electric Current + Glass
To make the Sun, combine Air and Fire. To make Energy, combine Earth and Fire. To make Life, combine Water and Energy. To make Radio, combine Sound and Electricity. To make a Battery, combine Energy and Metal. To make Light, combine Fire and Air. To make an Electric Current, combine Battery and Wire. Finally, to make Glass, combine Sand and Fire.
Once you have all of the ingredients, you can combine them to make a Solar Cell in Little Alchemy 2.
