RadioBanter - View Single Post - Running a radio from a large rechargeable cell or battery

November 1st 05, 03:47 PM

wrote:

All but the really cheap inverters are in metal boxes, so I don't think
sheilding and such is an issue as much as the high slew rate on the
mains.

[...]

wrote:
1% distortion quoted above by Eric is a very nice number. Both types
of inverters square and sine can cause problems with noise. Do not
confuse high frequency switching noise with lower frequency harmonic
distortion that you would get with square waves. They are not the
same. Noise can come from many different sources within the inverter.

Noise *can be* an issue. One of my inverters -- the 500 watt one --
put out a fair amount of RF noise when running a 700 watt load. But
simple snap-on ferrites help if you have that problem.

The house inverter is much larger and rarely is pushed to rated load.

As for why... The Exeltech inverters use a high-frequency oscillator
and PWM to synthesize the waveform, as far as I can tell.

--
Eric F. Richards

"Nature abhors a vacuum tube." -- Myron Glass,
often attributed to J. R. Pierce, Bell Labs, c. 1940