Yeah, at about $12 I opt to just buy a turn key solution. Then too, with patience and time you could roll your own.Wind 10 turns on a power line frequency toroid core with the current carrying conductor passing through the core and see what it sends through a 220 ohm resistor. Multiply the turns until you can send 0.01 amp through a 2.2 volt (red) LED.
That's the long form of, "I don't know"...giving you a method.
Still, you're going to find out current transformers are for sale because it's a giant PIB to wind your own.
Absolutely, I agree and mentioned that. The thing with all these pump threads always comes down to how much do we want to know about the pump. Voltage going to the pump doesn't tell us if the pump is running, current to the pump is a good indicator the pump is running, well pretty good unless the pump is sitting there locked rotor (impeller) or the pump is running dry. The list of weird pump scenarios goes on and on. Pumps are just one of those things.A little discussion here: A wall wart won't show current flow. Same mistake I made with the neon indicator.
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