what is the size of a UPS to be used on an office block with 60 offices?

Answer 1

It all depends on the equipment in each office. But for a start.
Say each office has a 2 desk top computers at 300watts each.
That is 600watts per office x 60 = 36000 or 36kW.
It no good having just the computers on by themselves so say you had a server allow 3kW for that.
What about the lighting, heating and air conditioning.
Rough guide for lighting is 15Watts per sq mtr x 60 offices say 4mtrs x 5 mtrs each 18000watts 18kW.
Heating and Air conditioning wouldn't normally be on UPS.
So for a start you are looking at a UPS to be able to sustain the load until the standby generator starts which is what you would use a UPS for.(Say 1/2 hour, if the gennerator doesn't start in 1/2 hour it's no going to anyway).
So we have a load of about 60kW for 1/2 hour.
UPS sized at 60kW and the batteries for 1/2 hour 30kW/250
= 30x4=120Amp hour or about 60 car batteries.

Answer 2

about the same size as the office block

Answer 3

Well assuming each office has one 300W computer, you need at least 60 x 300W = 18 kW. So a 20 or 50 kW UPS should do nicely.

Answer 4

It depends on how much equipment you want to run. Unless it is really important you might want to run a maintained supply for computers and essential equipment. Run the rest on the normal supply.

If you needed 2kW per office you would need a 180kW UPS. That is one big heavy system!

Answer 5

Not as easy as that. You need to determine exactly what you want protected by the UPS and then calculate the ~ load. Note - its not wise to exceed 70% of the UPS rating so this will also have a bearing.

Answer 6

wouldnt choose to do it.
reduces the safety of the electrical system as earth loop impedance increase.
buy everyone a laptop instead and use smaller ups's local to the load.

just an idea.

what are you trying to do?