RMS amps, excluding the effects of all harmonic exponents; it could be called fundamental power factor.
REGULATOR Prevents overcharging of batteries by controlling charge cycle-usually adjustable to conform to specific battery needs.
RENEWABLE ENERGY Flows of energy that are regenerative or virtually inexhaustible. Most commonly includes solar (electric and thermal), biomass, geothermal, wind, tidal, wave, and hydro power sources.
STAND-ALONE SYSTEM (SA) A system which operates independently of the utility lines. It may draw supplementary power from the utility but is not capable of providing power to the utility.