Please sign in to view the rest of this entry.

<emphasis role="bold">Introduction</emphasis> It is said “95 percent of UPS problems are induced by battery/human error problems,” a sweeping statement, nevertheless one in general vogue at the moment. True, in the early days of development of the popular sealed lead acid battery, now correctly identified as the valve regulated lead acid (VRLA) battery, reliability was not high. Since that time some 20 years ago, there have been constant developments in design resulting in a reliabl…
Alexander King; William Knight: Uninterruptible Power Supplies. Batteries, Chapter (McGraw-Hill Professional, 2003), AccessEngineering Export