UPS for 3 phase 200 amp (208v) service?
Posted March 16th, 2009 by admin 1 Comment »
UPS Generator Question asked:
We have a 3 phase 200 amp (208v) service that will be running a bunch of computer gear. There is a 50kw natural gas generator (with auto-transfer switch) already installed in the building on that service. We just need to add battery backup to cover the generator start-up period (less than 10 seconds).
We have a 3 phase 200 amp (208v) service that will be running a bunch of computer gear. There is a 50kw natural gas generator (with auto-transfer switch) already installed in the building on that service. We just need to add battery backup to cover the generator start-up period (less than 10 seconds).
Assuming the service is fully loaded at 80% on each phase, how large a UPS do we need? The whole 3 phase thing really confuses me for some reason. LOL
Actually, you want to avoid having your HVAC gear getting bumped by 10 second power outages if at all possible. We’ve seen more than a few compressors carted away as scrap after one of those episodes.
Nonetheless, you are correct in that sizing a UPS to carry HVAC and lighting load is normally not done.