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2) You don't want AC to run 12V lights in general, you want DC. So that's OK. 3) About the only way you can make a 12V LED fixture more efficient is to replace the ballast resistor with a switching power supply. Almost all decent 12V fixtures already do this though; it's only the very cheap RV and boat type lights that still use resistors.
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In the past decade, the cost of energy storage, solar and wind energy have all dramatically decreased, making solutions that pair storage with renewable energy more competitive. In a bidding war for a project by Xcel Energy in Colorado, the median price for energy storage and wind was $21/MWh, and it was $36/MWh for solar and storage (versus
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