The average cost of electricity in SA is 37.79 c per kWh. For this calculation we assume 39.23 c per kWh from the electricity bill above. We assumed the home to be a single person. Perhaps they lived in a small home and working as their energy usage is lower than the average 1 person. In a period of 95 days, they consumed 913 kWh of electricity bringing to an average of 9.61 kWh per day. Annually the cost of electricity would be $1376.05.
A good-sized system for a household of this size would be a 1.5 kW system. We assume solar panels would be exposed to 4.84 average sun hours in Adelaide. this is the total time that a solar panel would be generating electricity, check this website for other states. We calculate that a 1.5 kw system would generate 7.26 kWh daily. It would not be enough to cover the entire electricity bill which uses 9.61 kWh a day unless you get a bigger system.
The average cost of a 1.5 kW solar system is $2450. You install one, but you still need to pay for about 2.35 kWh of electricity. You would however, save about $1039.55 a year. You’re looking at around 2.36 years to pay-back your investment. Your pay-back period may lessen substantially the bigger system you get. The more solar panels you get, the rate of prices decrease. The difference between a 5 kw and 6 kw system may be only a couple hundred dollars but the savings would be much higher.
You may not use all the electricity generated by the solar panels. You may not be home during the day and miss out on using the solar power then. A feed-in tariff (currently 44c per kWh) may be applicable when not using as much power, the excess energy not used will then be exported.
Do you still pay electricity bills with solar panels?
Going solar can get rid of your electricity bills entirely or remove a significant portion of it. You may still need to pay electricity bills if you find that the daily solar generated does not cover your daily energy usage, and you would need to pay electricity bills for periods where you are not able to use solar energy like when you are not at home.
How much will my electricity bill be with solar panels?
Your electricity bill would depend on how much electricity you draw from your retailer. Depending on when you use your electricity, you can just use the solar energy you generate. You may have to draw electricity during the evening when your solar panels cannot generate electricity.
Why is my electricity bill so high with solar?
Even if you have solar panels, there are a multitude of reasons that may impact the electricity bill. Your solar panels might be obstructed by trees, creating shade. Your bill might be particularly high during winter, as the amount of sunlight hours is reduced.