- absorbed glass mat agm
- alternating current AC
- altitude
- amorphous silicon
- ampere (A)
- ampere-hour (Ah)
- angle of incidence
- array
- autonomous system
- avoided cost
- azimuth
- balance of system (BOS)
- barrier energy
- base load power
- baseline performance value
- battery
- battery capacity
- battery cell
- battery cycle life
- battery self-discharge
