Sine wave generator output testing
Submitted: Saturday, Jul 31, 2021 at 14:50
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JJAdv
I bought a Genny to freeze down the fillets when the days are short and cloudy.. Thought.I would see what the power looked like on the scope.
I guess all good gennys output clean power, and all cheap ones may not be as clean.. My cheap inverter was really crappy...
Reply By: RMD - Saturday, Jul 31, 2021 at 15:06
Saturday, Jul 31, 2021 at 15:06
That is ok, but how does anybody who buys a generator, cheap or otherwise, and wish it use it for
camp power
check the sine wave etc, without an oscilloscope. Most don't have them and therefore would not know what wave was produced. Will you buy a few different brands of generator and then
test them, and chart the output waves, then people will more likely to know what is what.
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Follow Up By: JJAdv - Saturday, Jul 31, 2021 at 15:50
Saturday, Jul 31, 2021 at 15:50
I just tested what I has around, and thought others would be interested.. If someone wants to supply a few gennys I don't mind testing them..
I would guess all the gennys out there are pretty good. It seems the cheaper they are the noisier they get. There is a youtube video where a guy modifies the Kings to reduce the noise so he could use his
HF radio without interference..
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Follow Up By: RMD - Saturday, Jul 31, 2021 at 17:43
Saturday, Jul 31, 2021 at 17:43
Yes, cheaper ones are noisier but the assumption their waveforms are worse may not be true seeing circuitry is stolen/copied by a certain country who makes most of them.
You said your cheap one has frapoy wave form but yiu showed a video and siad itvis a nice sine wave. OR are you talking about a different generator to the one which you video tested. I assumed same same seeing no others shown on bench.
What did the
HF radio man do??? Is the noise you are referring to rf noise or audible noise? Not clear what you mean there and the concepts are very different.
As far as freezing fish, why would you question it. Aren't you charging batteries which runs the fridge/freezer which does the freezing? A generator never freezes fish!
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Follow Up By: JJAdv - Saturday, Jul 31, 2021 at 19:40
Saturday, Jul 31, 2021 at 19:40
I cant follow with all the typos..
But if you are an expert on this topic please do some playing around yourself and post it.. I am interested in what you find with other types and brands. Every one else just sees it for what it is.. Its an info bite..
Electrical noise is what I was referring to (I thought it was a given as we are talking radio interference and using scopes.. but hey.. maybe not).. Yes, I expect cheap gennys to be OK, or at least good enough.. There are many being used, and I don't find anyone really complaining about it.
I don't understand you freezing fish reply?
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Follow Up By: RMD - Saturday, Jul 31, 2021 at 20:20
Saturday, Jul 31, 2021 at 20:20
The radio interference he may have experienced, was it because of the generator inverter and closeness to the HF or from a 240v ac switchmode charger used at the same time to charge the battery the
HF radio was connected to? My bet it is the charger. If he was using the usual 8 amp 12v output to that battery then the rf noise would be horrendous. No one uses that method do they? especially somone who knows and operates a HF.
If people just run a genny to charge batteries then they would never know unless the batteries fail to charge because the charger couldn't accept the power delivery.
You mentioned the generator to freeze fish, they can't do it, only a freezer can.
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Follow Up By: JJAdv - Saturday, Jul 31, 2021 at 20:43
Saturday, Jul 31, 2021 at 20:43
There's one in every thread.. ;)
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Follow Up By: RMD - Sunday, Aug 01, 2021 at 12:28
Sunday, Aug 01, 2021 at 12:28
WE all know what a sine wave looks like but have no control over the output of any generator we may buy. Showing us yours is confusing to me because it doesn't prove anything much part from it is making a sine wave as expected it will. I asked, queried the HF man and what he did, but you refused to elaborate so we could get a picture of what was done. I think you are wrong in stating about noise and expecting ALL to know what classification of "noise" you were meaning, most would have no idea you mean electrical, radio frequency noise. You did mention the cheaper ones are noisier. Why would you use a HF unit why a generator was charging it's battery pack anyway, turn it off and charge a bit later. You didn't mention if what charging style was used as I asked about above. I would like to see some substance in what you show so credibility is better.
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Reply By: Geoff (Newcastle, NSW) - Saturday, Aug 28, 2021 at 17:16
Saturday, Aug 28, 2021 at 17:16
I did a bit of this sort of testing quite a few years ago with some extremely interesting results, if you are interested in this sort of thing.
At the time I had access to a range of
inverters and a couple of EU10i Honda generators.
One of the
inverters was from a quite
well known company that's still around today. At full load its output resembled no AC power waveform I have ever seen in my over 40 years in the electrical industry.
The best performer up to full load was one of the Honda generators, second best was the other Honda. I even tested them to about 1,600 Watts in parallel. They still performed extremely
well, they did have a little noise superimposed on the sine wave. I put that down to some form of "communication" between the
inverters to give them load balancing.
As was to be expected with any solid state switching device the 12V DC
inverters did start to become quite "wooly" on the output as they approached full load.
I am pretty sure I still have the screen capture images of these tests somewhere.
| Geoff,
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