Why is my inverter freaking out?
I have a 1500watt HF MSW. I don't use it often, so I am not acquainted will all of its oddities. Last year I tried to use it with my 65w fridge at it would not work (alarm sounded). Although it ...
Forum Discussion
Here's another picture of Tripp Lite "PWM sine wave" output. This one is claimed to be from a PowerVerter Plus Industrial Strength PV-1250FC, and looks like standard 4-step MSW to me:
The source of this picture is http://www.centralmiarc.com/docs/Reviews/dcacmaha.pdf.
A summary of the article:
- 3 MSW inverters were tested.
- All 3 have the standard 4-step MSW output waveform.
- The TrippLite inverter's output had a significantly cleaner output waveform than the others, resulting in significantly reduced conducted emissions.
I'm hoping the waveform picture is correct as there are a few things in the article that in my eyes question its authority:
- The article says the PV-1250FC weighs 10.5 pounds. TrippLite says 23.2.
- The article fails to mention that output waveform of all MSW inverters changes with the DC input voltage.
- I've scoped about a half dozen MSW inverters (mostly cheap ones) and have never seen anything remotely close to the noise level the article shows on the two other MSW inverters. There's got to be something more than "cheap inverter" behind this.
- The article says "MSW inverters produce stepped square waves that resemble a sine wave". I agree with this about as much as a motorcycle resembles a diesel pusher.
The source of this picture is http://www.centralmiarc.com/docs/Reviews/dcacmaha.pdf.
A summary of the article:
- 3 MSW inverters were tested.
- All 3 have the standard 4-step MSW output waveform.
- The TrippLite inverter's output had a significantly cleaner output waveform than the others, resulting in significantly reduced conducted emissions.
I'm hoping the waveform picture is correct as there are a few things in the article that in my eyes question its authority:
- The article says the PV-1250FC weighs 10.5 pounds. TrippLite says 23.2.
- The article fails to mention that output waveform of all MSW inverters changes with the DC input voltage.
- I've scoped about a half dozen MSW inverters (mostly cheap ones) and have never seen anything remotely close to the noise level the article shows on the two other MSW inverters. There's got to be something more than "cheap inverter" behind this.
- The article says "MSW inverters produce stepped square waves that resemble a sine wave". I agree with this about as much as a motorcycle resembles a diesel pusher.
