North American generators come in either 120/240V split phase or strictly 120V output configurations. A 120V renewable energy system with a prewired 120V generator will simplify installation as a 240V generator will with 240V systems.

A "genset" refers to a backup generator that uses an internal combustion engine. It comprises a generator and a motor. It can come in various shapes, sizes and fuel-supply choices. Small ultra-portable gensets are unsuitable for home-emergency or battery-charging applications. In general, a light generator like this is too small for any home backup use.