Transfer switch for automatically switching between alternative energy source and utility grid
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United States of America Patent
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Feb 28, 2017
Grant Date -
Oct 25, 2012
app pub date -
Jan 16, 2012
filing date -
Apr 20, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An automatic transfer switch configured for connection to a non-traditional, full-time or intermittent power source, such as a wind turbine or solar panel, selectively connects the non-traditional power source as a primary power source and a utility-derived power source as a secondary power source. The intermittent power source includes an energy storage device, such as a bank of DC batteries, to supplement power delivery during periods of low energy production. The power is provided to an AC load via a DC-to-AC inverter. The transfer switch includes an input to monitor the voltage level on the energy storage device and will switch from the primary power source to the utility power source when the voltage level on the energy storage device drops below a preset level. Thus, a loading condition that exceeds the rating of the inverter will not fault the inverter or limit the power available to the loads.
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