politics123
Active Member
So, I have a drainback solar HW system to which I'm attaching a whole bunch of temperature sensors to track usage and efficiencies. I'm using a differential controller (no, not an ELK, at least not just yet!) which is attached to two 10k ohm resistors. One on the roof that measures array, one at the tank that measures the tank. When the panel > tank, the differential controller powers the pumps.
Getting the temperature sensors to data log the various water temperatures is pretty easy.
What I need is a way to know when the pumps kick on. This tells me the period of time that the temperature sensors have "meaning." Essentially, I'm looking for a plug in contract-closure that closes when a certain amount of wattage is drawn from the outlet. Any ideas?
Getting the temperature sensors to data log the various water temperatures is pretty easy.
What I need is a way to know when the pumps kick on. This tells me the period of time that the temperature sensors have "meaning." Essentially, I'm looking for a plug in contract-closure that closes when a certain amount of wattage is drawn from the outlet. Any ideas?