The percentage self-consumption decreases with increased solar PV generation and when the household spends less time at home during the day. This means a higher proportion of the electricity is being exported to the grid and the household would benefit by shifting electricity consumption to times when there is greater generation from solar PV.
The percentage self-consumption of solar PV is an indication of how much of the electricity produced by a domestic solar PV array that has been consumed by the household. If half of the electricity produced by the PV is consumed by the household, the percentage self-consumption is 50%.
In practice, the level of self-consumption is often lower than this, particularly with larger PV systems. The figure below shows estimates of the percentage self-consumption for a household with annual electricity consumption of between 3,000 and 3,499 kWh.
Household electricity consumption is lower in the middle of the day, particularly for families who are out all day. This means that much of the electricity generated by the solar panels is exported to the electricity grid.
Battery storage can significantly increase the self-consumption of solar PV by households. The graph below shows an estimate of the solar self-consumption for a household with annual electricity consumption in the range 3,000 to 3,499 kWh and annual solar PV generation between 2,700 and 2,999 kWh.
Overall, these results suggest that the installation of solar PV panels contributes to a substantial reduction in electricity usage from the grid, in excess of the slight but consistent decreases in year- on-year electricity usage figures that appear in all households.
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