Re: Failover generators

["Andy Whitfield" <andywhitfield2002@xxxxxxxxxxx>]

--- In ukha_d@xxxxxxx, "Nigel Giddings" <nigel@...>
wrote:
> Paul,
> Using generators can open a whole can of worms...
> Things to consider:
> Stability - Small gennys can be noisey on the o/p and this upsets
> some UPSs. I have heard it said no more than 50% of load should be
> UPSs due to harmonics created by SMPS and effects on frequency
> stability circuits of Genny. I have 6KVA of UPS with no issues.

Many generators output a very poor sine-wave (if it can even be
called a sine wave) and line-interactive UPSs simply won't 'see' the
generator.
However true online double conversion UPSs don't care if the genny
outputs a lumpy square wave with spikes, harmonics, noise, etc.
If you buy an expensive, quality genny then you probably be able to
use a line interactive UPS but otherwise go for a true online double
conversion UPS.  I've got both types in stock.

> Depending on load and duration a UPS may be a cleaner, quieter,
more easily maintained solution....

Long runtime UPSs have a lot of batteries.   Consider the weight
factor!  I sold one a few months ago.  Weight approx two thirds of a
tonne.   :-)
I've also got long runtime UPSs in stock.
Andy the UPS man.