James Knott wrote:
Carlos E. R. wrote:
For an obvious reason: it was 4 car batteries in series.
If you were to look at telephone company batteries, you'd realize they have little in common with car batteries and in fact even predate them. The telephone office batteries are strings of individual cells wired together. They are also designed for continuous "float" service, while car batteries are designed for short term high current service.
BTW, I used to work for a telecommunications company and the -48V plant in the office I worked in provided about 7000 amps and could support that load for several hours. Not many car batteries are capable of that.
Depends on how many you have. The typical battery used in large scale UPS's (for bridging whilst the generators get going) is a 24v truck battery. I have no idea how much such a collection can deliver, but when it needs to run cooling, lighting, disks and e.g. 3-4 IBM 3090s of the old kind, it's quite a bit. Usually they're only designed to hold the load for 5-10minutes though. -- Per Jessen, Zürich (19.4°C) http://www.dns24.ch/ - free dynamic DNS, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org