Randall R Schulz wrote:
On Monday 01 December 2008 08:31, James Knott wrote:
Randall R Schulz wrote:
Hi,
Seeing the recent mention of UPS (on the thread "Of software RAID on SUSE Linux") a question came to mind:
If you have multiple computers, how does one get them to all initiate the desired actions when main power fails and the UPS takes over?
Randall Schulz ... Of course, with the cost of a UPS these days, why not have one for each computer, especially since the more computers you have on the UPS, the shorter time it will support them.
I thought of that, too, but presumably any given amount of energy storage is going to cost less if it comes in a single package with a single set of the other (non-battery) hardware, right?
Randall Schulz
One other thing. There are two variables in a UPS. The label rating, usually expressed in VA (volt amps) or KVA specifies how much power that UPS can handle. It does not refer to how long it can hold up the load. That time is determined by the battery capacity, which is usually specified in Ampere hours or current over time. For example, a 100 AH battery can provide 100 amps for 1 hour or 1 amp for 100 hours etc. Since consumer level UPSs usually have 12 volt batteries, you have to divide that Ah rating by 10, to allow for the fact that the UPS output is about 120V. UPS manufacturers will generally provide a table, listing expected times for various loads. -- Use OpenOffice.org http://www.openoffice.org -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org