UPS Sizing
UPS Sizing
(OP)
I am sizing a suitable UPS with a given continuous load and an inrush value in both RMS and Peak Values.
The Transient Loading condition of a UPS is:
Transient KVA = ( Cont. Load KVA + Inrush KVA)*1.5
where: 1.5 = 150% UPS overload capability
Inrush kVA = Inrush kVA of the largest load
Cont. Load kVA = continuous kVA of the rest of the
load.
My question is, am I going to utilize the measured Inrush Peak or the Inrush RMS?
The Transient Loading condition of a UPS is:
Transient KVA = ( Cont. Load KVA + Inrush KVA)*1.5
where: 1.5 = 150% UPS overload capability
Inrush kVA = Inrush kVA of the largest load
Cont. Load kVA = continuous kVA of the rest of the
load.
My question is, am I going to utilize the measured Inrush Peak or the Inrush RMS?






RE: UPS Sizing
Common sizes nowadays are 75KVA, 125KVA, 225KVA, etc.
If affordable, go with N+1 redundancy and run units in parallel for most reliability and ease of maintenance.
If load is 100KVA, get a single 125KVA of even better two running in parallel.
RE: UPS Sizing
rectifier/inverter. If all is well, load should rarely have to be restarted.
RE: UPS Sizing
Do you have any vendor reference or standard clause reference that states this kind of operation. I would appreciate it much.
RE: UPS Sizing