Electronics > Power/Renewable Energy/EV's

Where does a smart gas meter get is power from?

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coppice:
Some gas and water meters with shut off valves have quite a small battery for something with a chunky valve. They don't expect a huge number of valve operations over 10 years, and use a supercap to slowly store up enough energy from the battery for a single shot of valve operation, avoiding excessive short term loads on the small battery.

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