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Why is the UPS thermal dissipation rating calculated using efficiency data different from the value specified on www.apc.com?

The thermal dissipation rating specified on the APC website is sometimes different than the value calculated using efficiency data or the UPS Efficiency Comparison Calculator.

The value calculated using efficiency data or the Efficiency Comparison Calculator is based on nominal environmental conditions (25C, 230V 50Hz input), in green mode with a fully charged battery.
The values on the web are specified for less-than-nominal environmental conditions, such as maximum charging power, active AVR, high ambient temperature, etc.

Both values are correct, depending on the circumstances. Calculated values are typical for nominal conditions, and the ones specified on the website apply for worst-case scenarios.

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