Jim's issue is due to variations in the engine speed. No buck/boost transformer
will fix that.
He needs to get the sensitivity ("gain") on the governor adjusted properly,
from the way things sound. A well adjusted mechanical governor shouldn't vary
more than 3Hz at load changes, and that would be heavy loads. If it does,
something is not adjusted properly or he's got fuel system issues.
The sine waves won't be bad from this machine. The problem is frequency
variation, which a lot of modern devices (UPSs' included) won't tolerate. Go
outside of the window of acceptance and they go offline.
Even more common with commercial units, as they want to keep the duty cycle as
low as possible on the inverters, so they'll have a really narrow window of
acceptance for frequency that makes them not like anything that's less stable
than utility power.
Big issue in my former line of work. Often required that we force the UPSs'
frequency window to be opened up when on standby power. A lot of commercial
UPSs' have an input that tells them to open up the frequency acceptance when a
dry contact signal is present.
Dan
Sent from my iPad
> On Oct 7, 2015, at 10:28 AM, Curly McLain via Mercedes
> <mercedes@okiebenz.com> wrote:
>
> You need a "buck booster" in between. basically regulates the power supply.
> takes crappy waves and makes nice sine waves.
>
> Had that problem with helco in Hawaii. had to use a buck booster between the
> building power and electronics not designed to handle turd world power
> utilities.
>
>
>>> but they wouldn't recharge on my generator which tended to run
>>> outside the 57-63 Hz UPS threshold for OK power.
>>
>> IIRC, that is a bit of an issue. These things need a "Hey,
>> it's not _that_ bad" switch on them or something. Shut up
>> and eat your electrons...
>>
>> Ironically, I have the worst problem with Big Bertha. Its
>> regulation is terrible. I'm not sure what it is, I may
>> have something wrong that could be addressed, but we've
>> only used it a handful of times, after the power has been
>> down for days and it's time for hot showers, laundry, etc.
>> It works good enough for that, but the UPS's aren't buying
>> it. "You call _that_ power? My _kid_ could make better
>> power than that."
>>
>> -- Jim
>
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