Size: 2093
Comment:
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Size: 2110
Comment:
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Deletions are marked like this. | Additions are marked like this. |
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||{{attachment:NoBattery.png| |width=300}} ||The red circle represents the total energy consumed over some time period.<<BR>>The green circle represents the emissions free energy generated by PV panels over the same time. <<BR>>It is shown slightly larger that the red circle, as is the [[SolarPowerPerformance|case for GWUC]] over a year<<BR>>The intersection of the circles represents energy both produced and consumed, that is self consumption. <<BR>> The remaining part of the red circle is energy bought from the grid. It adds to our emisions at a rate depending on the emissions intensity of the grid.<<BR>>The remainder of the green circle represents energy generated but not consumed, that is the surplus that is exported to the grid. This reduces emissions from the grid by the same intensity.<<BR>>The size of both circles and the degree of overlap will all vary with time, weather etc. However we can neglect that by taking a long time interval, say 1 year. || | ||{{attachment:NoBattery.png| |width=300}} ||The red circle represents the total energy consumed over some time period.<<BR>>The green circle represents the emissions free energy generated by PV panels over the same time. <<BR>>It is shown slightly larger that the red circle, as is the [[SolarPowerPerformance|case for GWUC]] over a year.<<BR>>The intersection of the circles represents energy both produced and consumed, that is self consumption. <<BR>> The remaining part of the red circle is energy bought from the grid. It adds to our emisions at a rate depending on the emissions intensity of the grid.<<BR>>The remainder of the green circle represents energy generated but not consumed, that is the surplus that is exported to the grid. This reduces emissions from the grid by the same intensity.<<BR>>The size of both circles and the degree of overlap will all vary with time of day and year, weather etc. However we can neglect that by taking a long time interval, say 1 year. || |
The effect of adding batteries to a solar system
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The red circle represents the total energy consumed over some time period. |
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Installing a battery does not change the energy consumed, the size of the red circle, nor the energy generated, the size of the green circle. |
Notes
Adding the battery will actually increase consumption slightly as charging and discharging cause some losses as heat. See here.
- The carbon credits for the saved emissions due to exported energy will be counted by the power company if they were signed over at installation, as is common.