Cell float voltage measurements – what’s good vs. bad?

Welcome to the February blog. This month’s edition addresses a common question I receive in training classes. A student asks, “I just took a set of cell float voltage readings on my UPS battery. What’s a good reading and what’s a bad reading? We could use some help on this.” Not only is this a common question but is a very good one. Somewhere in the maintenance process, one must review the readings and make that determination. A recommended source of good information, in most cases, is the battery manufacturer’s installation, operating and maintenance manual, also called the IOM. Table 9.1, clipped from Enersys’ IOM for its vented lead-acid batteries provides initial guidance. The example I’

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Rick Tressler, LLC

95 Ceramic Dr.

Columbus, OH 43214-3003

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rick@ricktressler.com

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