Originally Posted by herk7769
Laptops work just fine on Modified Sine since they actually run off the battery even when the charger is plugged in.
Yep, that's one of the reasons why most modern notebooks/laptops
run just fine with MSW. Running off battery, the electronics cannot
"see" the waveform of the AC.
But there is a second reason why this works - the power supply/charger
is almost always a "switch mode" device; AC waveform simply doesn't
matter. When AC is available, I usually REMOVE the battery from my
notebook to prevent damage from overcharge. Unless the charger
is truly *PERFECT*, there will usually be some overcharge. Li-Ion
batteries don't like that and have reduced life time.
All my notebooks run fine off a 400 watt MSW inverter WITHOUT
the battery installed.........
The Switch Mode supplies don't care about wave shape and/or
frequency because they immediately convert the incoming AC to
DC to operate the rest of the circuitry. Even voltage can vary from
about 90VAC to about 250VAC for most Switch Mode power
supplies. (Nice for the manufacturer to build only one supply
that can be used world-wide!) Even a MSW waveform,
with it's rotten harmonics, will not bother a half way decently
designed Switch Mode power supply/charger. The Chinese-
built ones that I use work fine with a MSW inverter......
Many other modern electronic devices with Switch Mode supplies
will work well with MSW inverters. Of course, devices like the
microwave oven you mentioned - devices with a transformer - will
NOT like the harmonics in a MSW waveform. But that's
(Typed from a notebook WITHOUT battery.......)