3phase ac/dc

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MBLES

Senior Member
A customer is requesting a UPS for 200a 208 3phase. Is knowing just the voltage and amperage help size the UPS.
 
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adamscb

Senior Member
Location
USA
Occupation
EE
MBLES said:
A customer is requesting a UPS for 200a 208 3phase. Is knowing just the voltage and amperage help size the UPS.
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I would also ask the customer how long they want this UPS to supply power at full load, but that's sizing the battery banks, not the UPS itself.
 
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SceneryDriver

Senior Member
Location
NJ
Occupation
Electrical and Automation Designer
MBLES said:
A customer is requesting a UPS for 200a 208 3phase. Is knowing just the voltage and amperage help size the UPS.
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Holy Scoobysnacks! That'll be a HUGE UPS. I hope they have their checkbook ready. Would a backup generator be more cost effective, even with the short interruption during genny start and transfer?


SceneryDriver
 
M

MBLES

Senior Member
electrofelon said:
I would try to get more info about the load. Is it just a 200 amp panelboard that runs, say, 50-60 amps of load, or actually 200 amps of load?
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The UPS will feed a panel with around 120a. The UPS will back up Cell carrier equipment during generator maintenance for about 10-20 minutes until generator cycles back off. As far as size of UPS the sell 208 3phase 60kva UPS so i know they exist. Nornally inside these cell sites is a 24v or -48v power bay with rectifiers with 100ahr 12v batteries in series 24 or 48. Im not sure why but they want the 208v 3phase to be switched. I know im missing something just not sure what..
 
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