Question and explanation
UPS questions, clearly answered.
Find concise answers to questions customers often ask. Each page starts with the direct answer and then explains the technical context.
Basics
Common questions about UPS systems.
These answers provide an initial guide. A specific selection must still account for the actual equipment and the intended response to a power failure.
BasicsWhat is a UPS?
Purpose, operating principle and typical applications.
Read the answer SizingHow big does a UPS need to be?Understand watts, VA, actual load and sensible reserve.
Read the answer RuntimeHow long does a UPS last during a power outage?Consider load, battery configuration, age and the runtime target.
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Look up a term or size a specific UPS.
The lexicon explains individual technical terms. For a specific selection, ERREPI reviews the load, runtime, connection, installation site and operating concept together.