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Active Power CleanSource(R) 750HD UPS Significantly Improves Electrical Infrastructure Reliability

Integrated Flywheel UPS Provides Greater Reliability Versus Double-Conversion UPS With Batteries

AUSTIN, TX -- (Marketwired) -- 08/27/14 -- According to a new UPS reliability assessment conducted by MTechnology, Inc., Active Power's CleanSource 750HD UPS improves the reliability of mission critical electrical systems compared to a legacy UPS. The key finding of the report was that CleanSource 750HD reduced risk of system failure by 21 percent versus a double-conversion UPS with a single string of batteries in utility outages lasting longer than 10 seconds.

The full assessment and results of the study can be found in Active Power's new whitepaper Mitigating Risk of UPS System Failure: Reliability Assessment of CleanSource HD Integrated Flywheel UPS versus Double-Conversion UPS with Batteries.

"With a dynamic electromechanical system like CleanSource 750HD, demand failures are highly unlikely," said Steve Fairfax, president, MTechnology, Inc. "With the flywheel spinning, any changes affecting system health are detected and repairable prior to an outage occurring. Conversely, a battery based system is an electrochemical process and exhibits non-detectable failures even with monitoring and routine maintenance."

Commissioned by Active Power, the study examines the reliability of CleanSource 750HD versus a double-conversion UPS with batteries and quantifies the likelihood of failure during three distinct scenarios -- a long utility outage lasting more than 10 seconds; a short utility outage lasting less than 10 seconds; and a demand failure. For this study, a demand failure is a condition where the UPS fails when called upon to support a load during a utility outage.

The study also evaluates the reliability of CleanSource 750HD with a secondary energy source which couples a flywheel with battery energy storage (Extended Runtime option) versus a legacy UPS.

Key findings from the independent study include:

  • CleanSource 750HD reduced the risk of failure by more than 21 percent during long outages versus the modeled double-conversion UPS with batteries, 6.73 percent versus 8.58 percent, respectively.

  • For short outages, CleanSource 750HD had an 80 percent lower probability of failure versus a double-conversion UPS with batteries, 0.50 percent versus 2.05 percent, respectively.

  • The likelihood CleanSource 750HD would not support the load when called upon (demand failure) was dramatically lower compared to a double-conversion UPS with batteries, 0.000067 percent versus 2.05 percent, respectively.

  • The addition of the Extended Runtime option to CleanSource 750HD further improved reliability over legacy UPS. During long outages, CleanSource 750HD with Extended Runtime reduced the risk of failure by more than 23 percent versus a double-conversion UPS with batteries (6.60 percent versus 8.58 percent, respectively). During short outages, the system reduced the risk of failure by 85 percent (0.36 percent versus 2.46 percent, respectively). The improved reliability is due to the presence of two distinct energy sources (flywheel and batteries).

  • The most likely failure mode of a double-conversion UPS with batteries is due to undetected battery failures. Non-detectable and detectable battery failures account for more than 83 percent of all double-conversion UPS failures.

"The UPS should improve reliability in an electrical design, not introduce additional risk," said Todd Kiehn, senior director, Product Management, of Active Power. "We believe this study presents clear evidence as to how operators can enhance reliability and mitigate risk of downtime to their mission critical operation with CleanSource 750HD."

"In addition to its superior reliability, the system is the most power dense UPS in the industry at the 750 kVA range, delivering approximately twice the power in half the space(1), and provides up to 30 percent lower operating expenses over a five year period versus an equivalent legacy UPS(2)," continued Kiehn. "This makes for a compelling offering for operators who are keen on lowering their overall operating expenses and don't have a lot of space dedicated for electrical infrastructure."

To learn more about Active Power's CleanSource UPS product line and modular infrastructure solutions, visit

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MTech Finds Active Power CleanSource 750HD UPS Significantly Improves Electrical Infrastructure Reliability.

About Active Power
Founded in 1992, Active Power (NASDAQ: ACPW) is a global leader in flywheel energy and power technology for mission critical applications. The company's products and solutions are unique because of its patented flywheel and power electronics technology that delivers critical power to leading innovators across multiple industries. The combined benefits of its products' power density, reliability, and total cost of ownership are unmatched in the market. The company's products and solutions are built with pride in Austin, Texas, at a state-of-the-art, ISO 9001:2008 registered manufacturing and test facility. Global customers are served via Austin and three regional operations centers located in the United Kingdom, Germany, and China, that support the deployment of systems in more than 50 countries. For more information, visit

Active Power and CleanSource are registered trademarks of Active Power, Inc. PowerHouse and the Active Power logo are trademarks of Active Power, Inc. All other trademarks are the properties of their respective companies.

(1) Footprint comparison based on published specifications of equivalent 750 kVA units with four standard battery cabinets versus CleanSource 750HD UPS.

(2) Savings based higher energy efficiencies (CleanSource 750HD UPS at 96 percent versus equivalent rated UPS at 94 percent); reduced cooling needs; lower maintenance requirements; and no battery changes.

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