I didn't run the heating over night. Only just now switched on.
OK thats a pity it would have been good to see if/how defrost changed as a result of switching off night shift and overnight there would have been plenty of opportunity. Next time!
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
My Vaillant was defrosting every 45-60mins overnight (chart shows FT). As you can see it doesnt fully recover from the defrosts because noise reduction mode is set from 11pm-71m, and struggled particularly to recover from the deep defrost following the DHW cycle. As a result IAT fell 1C overnight, but is now recovering again. Some would of course program this behaviour deliberately and call it 'setback'.
You can also see how the temperature rose during the evening as the OAT was falling. Also a deep defrost at midnight, prior to the DHW cycle, following the DHW cycle and then again at about 7am.
Yes, you can work out a lot from a plot of FT. Interesting that there were both deep and shallow defrosts, for reasons I dont understand.
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
