nanog mailing list archives
Re: UPS and generator interaction?
From: David Lesher <wb8foz () nrk com>
Date: Tue, 30 Mar 2004 10:31:37 -0500 (EST)
Oh, another detail. Some 98% of the UPSi around are "standby" units. They sit and trickle their batteries until the line fails, then quickly kick in. They take 'n' hours to recharge when the line returns. But there exist another genus. These 'full time' units ALWAYS run the load from the UPS inverter; and have a big AC line->DC "battery charger" -- big enough so as to keep up. The advantage is a very high degree of line isolation. Any surge, sag, glitch, spike may affect the AC->DC side of the equation, but will have to get past the battery plant and inverter for the load to see it. Note it does not even care what the input frequency is. I know of one large unit that was sent to Mexico City. At the time, it was 50Hz, but there was some announced plan for the city to go to 60, Real Soon Now. The UPS "battery charger" ran on anything between say 40-70 Hz, but the inverter made 60.0 Hz, period. Such units are not common or cheap. In the low end, Sola Corp used to make some in the low (1-3?) KVA range. Top end, how many KVA do you need? I think the one going to Mexico City was 500KVA. If your power is really rotten [Here, Guyana comes to mind...] you may want to spend more up front. Side thought, but not a NANOG topic. What in your data center really cares if your generator puts out 57 or 63 Hz, not 60.0? Why? -- A host is a host from coast to coast.................wb8foz () nrk com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Current thread:
- Re: UPS and generator interaction?, (continued)
- Re: UPS and generator interaction? Mike Leber (Mar 29)
- Re: UPS and generator interaction? Mike Lewinski (Mar 29)
- Re: UPS and generator interaction? Jay Hennigan (Mar 29)
- Re: UPS and generator interaction? Daniel Senie (Mar 29)
- Re: UPS and generator interaction? Joel Jaeggli (Mar 29)
- Re: UPS and generator interaction? Scott McGrath (Mar 29)
- Re: UPS and generator interaction? David Lesher (Mar 29)
- Re: UPS and generator interaction? Robert Boyle (Mar 29)
- RE: UPS and generator interaction? kwallace (Mar 29)
- RE: UPS and generator interaction? Dave Hilton (Mar 29)
- Re: UPS and generator interaction? David Lesher (Mar 30)
- Re: UPS and generator interaction? Laurence F. Sheldon, Jr. (Mar 30)
- RE: UPS and generator interaction? Eric Germann (Mar 30)
- Re: UPS and generator interaction? Deepak Jain (Mar 30)
- Re: UPS and generator interaction? Chris Adams (Mar 30)
- Re: UPS and generator interaction? Deepak Jain (Mar 30)
- Re: UPS and generator interaction? Jay Hennigan (Mar 30)