Jim Wilkins wrote:
"Carl Ijames" wrote in message
news
"Jim Wilkins" wrote in message news
"Carl Ijames" wrote in message
news
I've heard of some electronic devices having problems running on
the output of a modified sine wave output inverter or small
generator that may not have the best sine wave shape. Would there
be any problem using a 1, 2, or 3 stage AC line filter to clean up
the output waveform of either, and would it do any good? They
aren't that expensive so adding one to a generator would seem to me
to make a lot of sense. What am I missing?

--
Regards,
Carl Ijames
AC line filters reduce higher harmonics but have little effect at
the
fundamental frequency. The components simply aren't big enough to
store much energy and return it later.

Ferroresonant transformers are 60 Hz sine wave filters with voltage
regulation, but look at the weight:
http://www.hammondmfg.com/CVR.htm

http://www.lamarchemfg.com/productde...rter)/263.html

See pages 13 and 14:
http://www.etmsolar.com/INFO2011/pvc...ers%20work.pdf
"Unfortunately, inductance causes the transformer to have a
relatively
low
efficiency (typically about 50%) and the waveform is very load
sensitive."

-jsw
================================================== =============

Grr, I misread the frequency scale on the datasheet attenuation
chart I was looking at, it was in kilohertz not hertz. I knew there
had to be simple reason or everyone would already be doing it.

--
Regards,
Carl Ijames

Here's an idea of what it takes:
https://www.shapellc.com/linetamer-p...ditioners.html

Before stumbling onto the free APC1400 SmartUPS I was looking for a
good, cheap sine wave inverter that would run my fridge, which needs
12A to start, 2A to run. What I found got terrible reviews. The TV
and all my laptops run fine on cheap "modified sine" square pulse
inverters.

The APC would be a good answer if it wasted less idle current and was
more tolerant of AC from portable generators. It has a button on the
back to reduce sensitivity to bad power but that isn't enough.
-jsw



Most items will run fine on the generator output. The only item in my
place that has any issue is a ceiling fan. It generates a strange buzz
on genny power. I'm guessing it is due to the multiple winding design of
the motor.

--
Steve W.