That’s a very high daily average compared to the typical 15-20 kWh daily average. Our daily usage is less than 12kWh total. Of that approx 40% is down to the RC split systems and 10-15% our water treatment plus pumping. We do not have town water nor sewage service. Solar PV provides approx 50% of that demand. The balance is exported for feed in benefits.
For the Sydney area a 5kw solar PV based on CEC data will better 20kWh daily average over the year. 30kWh would not be unusual in summer.
A rough guess is you might need a 10kW sized system to get the maximum benefit.
