I might be a weirdo, but I figure a 50amp subpanel is 12kva, so I got a 16kva generator for the 50 amp sub-panel fed by a 50 amp breaker from the main panel.

The reason for the generator being bigger than the sub-panel is that you can't put 12kva on the 12kva generator unless you perfectly balance both hot legs.  Since that won't happen, I bump the generator up a notch.  It's a sub-panel so if someone ever trips the 50amp breaker we'll know right away that there's more load than the generator could handle rather than finding out when the power is out and nobody's there.


On 8/12/2019 9:34 AM, Chuck McCown wrote:
I would get the one larger than you need with an automatic transfer switch.  I 
have had ok luck with geneac units.  You want it large enough to be able to 
start the hvac system,

Sent from my iPhone

On Aug 11, 2019, at 9:51 PM, Rhys Cuff (Latrobe IT) <[email protected]> 
wrote:

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Hi Guys

I'm after a small 5kva generator for the server room
Will be feeding a 3kva ups.

Do you think its required to get an inverter generator?
Being is only going to be used as a charger and the UPS will clean the powe=
r up.

Thanks

Rhys



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