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Inverters: Electronic Loads, Surge Protectors and Radio
Interference
Sizing an inverter for electronic
loads
Most electronic devices (especially stereo and music amplifiers,
computers and TVs) are labeled with power ratings that are
based on absolute maximum or surge conditions, for the purpose
of sizing power circuits. Their actual power draw may be HALF
of that, or less. The best way to measure the peak and average
power consumption is to use a Brand Power Meter or other kilowatt
meter.
Surge protector warning
Do not use household or computer type surge protectors on
circuits powered by a "modified sine wave" inverter. They
may overheat. Inverters do not produce dangerous spikes or
surges, so protectors are not necessary. EXCEPTIONS: Use a
lightning arrestor on any long AC feed line to another building,
for example, or to a well pump. Long lines can pick up induced
surges from lightning, and feed them back to the inverter
and to the AC circuits.
AM radio interference
ALL inverters produce radio interference in the AM and shortwave
bands. It may be necessary to use a radio that is powered
by DC or internal batteries, and is not located near the inverter.
To hear distant stations, it may be necessary for the inverter
to be off.
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