Smarty wrote:

There is no such thing as "peak-to-peak" ratings for a generator measured in
"fractional seconds".

You might be thinking of "peak", "surge", "maximum inrush" or other such
terms which describe the brief maximum current which the generator (and its'
associated fuse/breaker) can deliver.

"Peak-to-peak" is used in electrical engineering to describe the amplitude /
height of an analog waveform when measuring from the maximum negative to
positive swing. For a sine wave (the most common form of alternating
current), it represents a value which is about 2.8 times the average / RMS
value.

http://en.wikipedia.org/wiki/Peak-to-peak

Smarty


"Tony Hwang" wrote in message
news:HWTbi.21076$1i1.8301@pd7urf3no...

Toller wrote:

A month or two go I asked here if a Yamaha EF1000, which will produce 8a,
will start my refrigerator that draws 13a at startup.
The majority opinion was probably; the fridge probably doesn't need 13a
to start and the genny will probably produce more than 8a for a short
time; so between the two...

As it happens, one retailer claimed that Yamaha told them the EF1000 will
produce 3500w for 3 seconds, which is not supported on the Yamaha
website. I called Yamaha and was told that their website says it will
produce 1000w, so that is all it will produce. Eventually I got to the
supervisor's supervisor, who said that it will do 3500w, but they are not
making that claim anymore. (presumably they got complaints from people
who didn't understand what "3 seconds" meant.)

So I bought the EF1000. It will actually start my shopvac, which draws
16a at startup. I haven't pushed it any harder, so I can't actually
verify the 3500w, but it is good enough.
Alls well that ends well.

Incidentally, Honda told me the absolute max on their EU1000 is 1000w and
it will not start my fridge; I don't know if someone higher up would say
otherwise.

Hi,
If you think in terms of peak to peak rating. But that is measured is
fractional seconds.



Hi,
You just explained what I said in plain language.
Yup, peak to peak, average, rms three terms commonly used.
Remember stereo salesman used to use peak music power to sell El Cheapo
amps? Kikewise! Marketing gimmicks are many and confusing to gemeral
consumers.