[FieldDay] Generators and UPS

[Arthur Shulman]

The UPS might be responding to distortion in the expected sine wave of
the generator output. I also use UPSs of a slightly larger capacity (APC
SmartUPS 1400), and the dropout senssitivity is adjustable either
through a dip switch or through software. Do you have that capability in
your unit?
You're right; they are very sensitive - they have to be to sense an
impending dropout and come online very fast.
Try this:
Borrow a larger UPS if possible.
Make sure the batteries are hot-swappable and not connected to the line
in any way.
Remove or disconnect the internal batteries.
Add external lead-acid (automobile or marine type) batteries in series
if necessary to make up the original battery voltage.
Keep the batteries charged from the generator 115v output, and a husky
battery charger.
Connect the load to the UPS as usual. (Don't connect the UPS line cord).

Or:
If you don't need 115v power, forget the ups & run the station on 12
batteries alone. If you need to run computers, use laptops and 12
adapters.

Arthur Shulman, VE3ZV

"Steve L." wrote:

> I've yet to find a commercial 'computer type' UPS that
> will run from my generator.
>
> I'm using APC UPS in the 400-500VA class and a
> Kawasaki 1200W motor-generator. The output looks great
> on a scope but the UPS will beep and click in-and-out
> like the line is dropping in/out.
>
> I'm assuming there are some harmonics or spikes or
> SOMETHING the UPS is responding to, but I haven't
> noticed them on my scope.
>
> Anyone find a UPS that will run from a generator?
>
> I run my radios from a 12V deep-cycle marine battery
> and put a charger on the battery from the generator.
> That way, I can kill the generator at any time and the
> stations stay operating. Also, in the late, late night
> I kill the generator and the stations can run from the
> batteries for many hours and everyone else can SLEEP.
>
> 73, Steve N4SL
> Machias, WA CN88
>
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