I have a surface mount solar pump I bought from China. It is one of the brushless type motors. This one came with it's own inbuilt controller. No instructions or anything. Just two wires coming out of the pump.
The pump itself works fine however I need to add a tank high and tank low setup.
I found if I briefly short the two pin header (black one in photo) the pump stops slowly, then it will restart within ten seconds after the pin is no longer shorted.
I have a double magnetic float switch. Essentially two floats on a rod. Either switch can be configured NO or NC.
https://www.ebay.com.au/itm/125654993571I made up this wiring diagram. It should work like this.
Tank full as per picture. Tank level dropping the high level switch will go closed, relay stays off.
Tank drops blow bottom switch, it goes closed, relay goes on, opening the header pins. Pump starts.
Tank fills, bottom switch goes open, but the relay remains on.
My question is. What reliable relay do I get? I might be able to get 5V off the control board, or is there something the solar panels could power?
For those interested the other (orange) two pin header if shorted puts the pump in a low well condition (I guess this as other pump controllers have this feature) as it will keep the pump shut off for half an hour or so before restarting. The idea being when the water level rises to above the sensor, it gives the well another half an hour to make water up.
No idea what the five pin header is for, but I suspect it is for programming the STC controller chip.