// HOW IT WORKS
Buy cheap at night. Use it all day.
Your battery fills up overnight when electricity is cheapest, then runs your home through the day. Add solar and the sun does even more of the work.
1
Battery only
The grid fills the battery overnight; the battery does the rest
Your home runs on
Grid (off-peak)Your battery
1
Overnight
00:00 to 05:00
The grid fills your battery at the cheap rate and runs your home.
2
Day
05:00 to 21:00
Your battery runs the home, so you buy almost nothing at the peak rate.
3
Late evening
21:00 to 24:00
The battery keeps running your home and exports what it will not need, so it is empty and ready to refill.
For a typical family home (3,500 kWh a year, 16 kWh battery), about 8.6 kWh a day moves from peak-rate to cheap-rate electricity. That shift is the saving.
2
Solar & battery
Same home. Solar takes over in the middle of the day
Your home runs on
Grid (off-peak)Your batterySolar
1
Overnight
00:00 to 05:00
The grid fills your battery at the cheap rate and runs your home.
2
Middle of the day
09:00 to 16:00
Solar runs the home and tops up the battery, then exports the rest.
3
Morning and evening
05:00 to 09:00, 16:00 to 21:00
If there's a shortfall in solar generation, including before sunrise or after sunset, the battery runs the home.
4
Late evening
21:00 to 24:00
The battery keeps running your home and exports what it will not need, so it is empty and ready to refill.
Add a solar array and on a typical day solar covers the middle of the day. The surplus is exported. Savings plus export income are your benefit.
Indicative only.Times and amounts vary with the season, your tariff and how you use power. The cheap overnight window shown (00:00 to 05:00) is a typical off-peak tariff.