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Old 06-07-2014, 12:17 PM
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Join Date: Mar 2005
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Weathermatic spec'd their brass valves with the S24B solenoid as capable of 12VDC operation, at 75 psi or less of supply pressure, so the concept of continuous DC operation from a strong battery kept charged by way of solar power, has been around for awhile, and is more do-able than ever.

There could even be circuitry to convert without great energy loss, the DC power to AC power, and to even tone it down from 24 VAC to something closer to the 18 VAC that is the actual spec'd opening voltage for most common zone valves.
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