Emergency Lighting Inverter System

[faresos]

I'm working on a Data Center project, The whole building will be backed up by an emergency generators. I determined that I will need 150KVA Inverter System for emergency lighting. My questions are:

1. Does anyone one makes 150KVA UL 924 listed inverter system? so far, the biggest I have seen is 80KVA.

2. Do I really need 90 Minuits battery back up time since the whole building is backed up by the emergency generators? someone have told me that since the building backed up by generators you could use 20 Minuits battery back up time (not sure where this exception came from!).

Thanks you,

 

[bsh]

emergency lighting has to operate for 90 minutes. You can do this with a battery or you can use a generator. You don't need both.

 

[faresos]

emergency lighting has to operate for 90 minutes. You can do this with a battery or you can use a generator. You don't need both.

This is true that I don't need both but the client wants to have it because he doesn't want the building to be complete in the dark when the generator trying to start in case of power failer.

 

[bcorbin]

150 kVA? Sheesh...how big is this data center? A typical 3-lamp 2x4 fixture is approximately 60 VA when lighting two lamps in emergency mode. You're saying this building has the equivalent of 2500 2x4 fixtures in it that need to be backed up by emergency power? Do you work at the Pentagon?

*EDIT* Re-reading this, it sounds like I'm being sarcastic. I'm just surprised at the amount of kVA. Perhaps you miscalculated or over-estimated the amount of lighting you actually need?