CALGARY, Alberta—(BUSINESS WIRE)—March 8, 2001—Sustainable Energy Technologies Ltd (CDNX:STG.) announced today that it has successfully completed initial testing of its next generation power inverter.

Results show that the 4 kW dc to ac inverter has a peak efficiency of 96% at 20% of full load, exceeding industry achievements to date. More importantly, the test showed that as power was increased the efficiency dropped only slightly, maintaining an average of 95% efficiency at full load. These efficiencies were achieved for input voltages ranging from 44 – 66 Volts dc using Sustainable Energy’s patented switching algorithms. “This is a significant milestone”, says Michael Carten, President & CEO. “The ability to accept such a wide range of input voltages while maintaining very high efficiencies is a critical factor in achieving industry efficiency targets, and is one of the key features that distinguishes our product from other power inverters on the market.”

Sustainable Energy is also completing development of a software configurable dc-dc converter that has a very fast response time as well as bi-directional “buck” and “boost” capability. The dc-dc converter is used to charge and discharge the batteries that are used in a stationary fuel cell system to maintain a constant power output as the customer’s load changes.

“These two technologies (inverter and dc-dc converter) will be deployed as part of an ‘integrated’ fuel cell management system controlling the key power electronics functions and providing supervisory control for the fuel cell system.”

Sustainable Energy expects to deliver evaluation prototypes to the industry in May 2001.

Sustainable Energy Technologies Ltd., headquartered in Calgary, Alberta, is developing, commercializing and marketing energy management and power conditioning products for micro-generation applications such as fuel cells and solar energy. Sustainable Energy’s technologies provide power quality control and improve the efficiency of these applications, contributing to reduced electricity costs and greenhouse gas emissions.