Hot water system efficiency
I just had an aging solar boosted elec hot water system replaced with a full electric system. We have rooftop solar , no battery.
At present the HWS is wired up as control load 1, which gives access to cheap elec (17c/ KWH) from 10pm to 7am weekdays, plus some boosted times in the day (not clear from supplier website when), plus all WE. The regular rate is 35c/ KWH.
I'm wondering if it's more cost effective to take the HWS off that CL1 circuit and heat during the day on solar instead.
Not sure how to work this out. I think I can find out CL1 use from the meter. We have no smart meter. I run various appliances during the day, inc AC - NSW so quite a few days in summer I need AC on most of the day. Not sure whether AC plus HWS on together would exceed the solar?
How can I work out how much each appliance costs to run (in energy) whether 2-3 hours on solar would heat the HWS adequately? And what else do I need to know? Currently try up use appliances one by one when possible, eg oven separate from dishwasher, so as to stay within solar production.
Apparently you can't switch as needed from CL1 to not, so can't do it day by day depending on weather
TIA!