Why Self-Consumption Matters
Self-consumption is the percentage of solar energy you use directly in your home, rather than exporting to the grid. Since feed-in tariffs (5-8c/kWh) are much lower than the price you pay for grid electricity (28-35c/kWh), every kilowatt-hour you consume from your own panels saves you roughly four times more than exporting it.
The Maths
Using 1kWh of your own solar saves you ~30c (the grid rate you avoid paying). Exporting that same 1kWh earns you only ~7c. That means self-consumed solar is worth 4x more than exported solar.
Shift Your Energy Usage to Daylight Hours
The single most effective strategy is to run your biggest appliances during solar production hours (roughly 9am to 3pm).
Set Timers on Appliances
Use delay-start timers on your washing machine, dryer, and dishwasher to run during midday when solar production peaks.
Heat Your Water with Solar
If you have an electric hot water system, set it to heat during the day (10am-2pm) instead of overnight. A timer switch costs around $50 and can save hundreds per year.
Run Pool Pumps During the Day
Pool pumps are one of the biggest energy consumers in a home. Set your pump timer to run between 10am and 3pm to power it with free solar.
Charge Devices During the Day
Laptops, tablets, phones, robot vacuums: plug them in during solar hours.
Consider a Battery
A home battery stores excess solar for use in the evening and overnight, boosting your self-consumption rate from a typical 30-40% up to 80-90%. While batteries add upfront cost, the savings from avoided grid electricity make them increasingly worthwhile as electricity prices rise.
Use Energy Monitoring
Install an energy monitoring system (most modern inverters include this) to see exactly when and where your energy is being used. Apps like Fronius Solar.web and Sungrow iSolarCloud show your generation, consumption, and export in real time.
Watch the Patterns
After a week of monitoring, you'll quickly spot when you're exporting the most solar. That's your opportunity: shift appliance usage into those peak export times and you'll save more.
Smart Home Automation
If you're tech-savvy, smart home devices can automate energy shifting:
- Smart plugs with scheduling to turn on appliances during solar hours
- Smart hot water controllers that divert excess solar to your hot water system
- Home automation platforms like Home Assistant that trigger devices based on solar production
Cooking and Heating
Electric cooking appliances (ovens, air fryers, induction cooktops) use significant energy. Where practical, shift cooking to daylight hours. Similarly, if you use reverse-cycle air conditioning for heating in winter, pre-heat your home during the afternoon while solar is still producing.
The 80/20 Rule
You don't need to obsess over every watt. Focus on the big three (hot water, pool pumps, and laundry) and you'll capture most of the available savings. These three alone can shift your self-consumption from 30% to 50-60%.
