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I am starting an aquaponics farm - using fish as fertilizer factories for growing vegetables hydroponically. So far I have a small "family-sized" system in the basement with 64 square feet of hydroponic grow space, and 200 gallons of fish tank. I only have minnows and goldfish at the moment - in...
I was trying for a cheap solution that would last a full day. Once every couple of years we get a storm that nocks out power for a day or more. Looks like the PC UPS is probably the best solution after all.
Thanks all for your comments.
Interesting idea - but the air pump does not create much pressure, so no matter how large an air tank, the pressure would quickly drop too low during a power outage.
Both the relay coil and the air pump load use 120V AC. I see how a flyback diode would be important with a DC inductive load, but not AC. Perhaps a couple of 200V zener diodes connected back to back across the load?
I put together a simple automatic battery backup circuit to keep a 120V 18W aquarium air pump running through a power outage using a 12V battery, a DPDT 120V relay, a trickle charger and a 150W inverter. One pole of the relay is used to switch the 120V AC live feed to the air pump between mains...
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