Whistler HIGH SURGE POWER INVERTERS Owner's Manual page 26

OPERATING PRINCIPALS
The modified sine wave produced by
The modified sine wave produced by your Whistler inverter
has a root mean square (RMS) voltage of 110 volts. The majority
of AC voltmeters are calibrated for RMS voltage and assume
that the measured waveform will be a pure sine wave.
Consequently, these meters will not read the RMS modified
sine wave voltage correctly and, when measuring your Whistler
inverter output, the meters will read about 20 to 30 volts too
low. To accurately measure the output voltage of your inverter,
use a true RMS reading voltmeter such as a Fluke 87, Fluke
8060A, Beckman 4410, Triplett 4200 or any multimeter identified
as "True RMS."
For more information on inverters see our Inverter FAQ page
at www.whistlergroup.com/faq-inverters.asp
your Whistler Inverter
23
145 volts peak
115 volts RMS
0