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I'm in Perth, chances of that coming on are pretty lowThose solar assist things on your roof also have a low temperature switch to stop the unit freezing and bursting all the pipes. If it's a cold night 0-4 degrees (or whatever it's set to) the pump will run and send hot water up to the roof to stop it freezing. Sending cold water back into the tank..... You get the idea..
For water or power? Regardless, no.do you have an offpeak meter for your hotwater?
Its a solar boosted unit (Chromagen 30SV) with only a GPO plug as far as I can tell, so should be able to stick a timer on that?If you hadn't mentioned a timer switch on your hot water system, I'd be leaning towards a "controlled load" electric hot water system. It's what we've got in our house and it kicks in at 12am then runs for 30 minute cycles through to between 2am 3am depending on the amount of hot water we've used.
As it's a Controlled Load circuit operated by the network operator (Aus Grid) in our case, the Sungrow system doesn't actually pick it up, but the total figures from our retailer Discover show it. Have yet to have any word on being able to get visibility of that through the Solar system, but as they're 2 separate circuits it may not be possible. Still in discussions with the solar installers.