Originally Posted by Blue Stocking
If you could see what your local grid is supplying, you wouldn't worry half so much about this.
57 to 63 Hz and 112 to 125 Vac.
Most modern equipment
can deal with this, IMHO
I dont know where you are at, but not true in the USA. Power is strictly regulated at 60 hertz created by a grid massive generators that spin at precisely controlled speeds it is impossible for the frequency to vary and would cause catastrophic failure of the power grid if it did. It is literally accurate enough to run a clock, and most AC plug
in clocks merely use a small synchronous motor
with a 60 to 1 reducing gear
to keep the time, and will only lose a few seconds a year. Voltage is a lot less critical and depends on the impedance ratio between the final transformer and the load, but is usually 117-119 Volts RMS except in remote
areas or places and times the local service
is under peak loads. Noise
is miniscule due to miles of inductive filtering. The transformer on the input of most devices filters the rest. Modified sine waves are more like modified square waves. So you lose a significant portion (18-30%) of the power to noise
. Only a few cheap
low powered devices work with it. Motors work but consume more power and may not be able to start. Non computing devices will probably work, but cpu's can be confused by even small amounts of noise on incoming power. My personal experience; I tried several brands of MSW inverters before chucking them all in the trash and buying
a pure sine wave inverter
, (Xantrex 1KW). I have had no trouble ever since. It even runs the fridge smoothly and quietly, while simultaneously running the computer and the TV/DVD. The MSW 2.5KW would choke if I even ran 2 of the three and the fridge sounded like is was going to come apart and the compressor
ran very hot and often stalled popping the breaker. And the TV had wavy lines, etc...Buy what you want, but good luck selling the used MSW inverter after you are tired of dealing with it.