Oversize. It's the most practical way to ensure stability when powering a load that can have a poor power factor or a leading power factor. Datacenter loads being a perfect example. Switching power supplies with poor input filtering, UPSes that dump their entire load on the genset all at once, variable frequency drives on HVAC equipment, etc. are all present in datacenter loads and will all wreak havoc on your generator.
I recommend reading this article: http://www.cumminspower.com/www/literature/technicalpapers/PT-6001-ImpactofPowerFactorLoads-en.pdf Any new generator in that size range will have an electronic governor, this is a must. There are lots of small things to consider, like block heaters if you are in a cold climate, and using algaecide if you're storing diesel. Find a vendor who knows what they're doing. Finally, monitoring. Make sure the generator has a built-in control system that will report errors. Most do this with a simple dry contact closure. You can tie this in to your building monitoring system if you have one to alert you if there is a problem, or attach to a SNMP capable device and monitor it using Nagios or whatever your network monitoring system is. Generators need to be tested frequently. Even the best ones love to die at very inopportune times. Mine exercise weekly and I run a load test every month after hours. Patrick Shoemaker Vector Data Systems LLC [email protected] office: (301) 358-1690 x36 http://www.vectordatasystems.com Chuck Hogg wrote: > Ok, so I am in the market for a Generator. Looking for probably > 30-45kW. I’ve heard people say I need a PMG Exciter?? Anyone with > experience in doing this? It’s to support our datacenter, a few racks, > a few 2200 UPS’s and PDU’s, and Cooling. I find all kinds of different > ones on eBay and elsewhere, and am hoping someone already did the > legwork and figured out everything they needed and can share? > > > > Regards, > > Chuck Hogg > > Shelby Broadband > 502-722-9292 > [email protected] <mailto:[email protected]> > > http://www.shelbybb.com > > > > > ------------------------------------------------------------------------ > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
