Load (linear) - Load for which voltage form and current form are similar. Voltage and current are related by Ohm's law U(t) = Z x I(t).
Nominal Voltage - The characteristic operating voltage or rated voltage of a battery.
Energy Density - The ratio of the energy available from a battery to its volume (Wh/L) or weight (Wh/kg).
Load power - Apparent power Pu that the UPS inverter supplies under given load conditions. It is less than or equal to the rated output Pn. The ratio Pu/Pn defines the % load of the inverter.
Harmonic Sinusoidal - Term of the Fourier series expansion of a periodic function. The harmonic (or harmonic component) of the nth order is characterized by - Yn is the rms value of the given harmonic component, w is the angular frequency of the fundamental, related to frequency by - w = 2_f; phin is the phase angle of the given harmonic component at t = 0.
Brownout - A steady state RMS voltage under nominal by relatively constant percentage.
Short-Circuit Current (SCC) - The initial value of the current obtained from a battery in a circuit of negligible resistance.