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Update powerwall.markdown
Add documentation for new sensors added in home-assistant/core#108339. Also clarifies the different sensors per Backup Gateway and per Powerwall
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source/_integrations/powerwall.markdown

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@@ -34,7 +34,7 @@ There is currently support for the following device types within Home Assistant:
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### Binary sensor
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The following binary sensors are added for each Powerwall:
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The following binary sensors are added for each Backup Gateway:
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- Grid Services - On/ Off
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- Grid Status - On/ Off
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### Sensor
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The following sensors are added for each Powerwall:
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The following sensors are added for each Backup Gateway aggregated across all Powerwalls:
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- Powerwall Backup Reserve - Reserve energy for grid outages in %
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- Powerwall Battery Now - Usage in kW
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- Powerwall Backup Reserve - Percentage of battery which will be reserved for a grid outage
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- Frequency/ Average Current/ Average Voltage Now
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The following sensors show the direction of energy:
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The following sensors show the direction of energy in aggregate:
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- Powerwall Solar Export - Solar energy exported in kWh
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- Powerwall Solar Import - Solar energy imported in kWh
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- Powerwall Generator Export - Generator energy exported in kWh
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- Powerwall Generator Import - Generator energy imported in kWh
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The following sensors are added for each Powerwall:
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- Powerwall Battery Capacity - Capacity in kWh
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- Powerwall Battery Remaining - Remaining capacity in kWh
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- Frequency/ Average Current/ Average Voltage Now
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- Powerwall Load Now - Load usage in kW
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- Powerwall Battery Export - Battery energy exported in kWh
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- Powerwall Battery Import - Battery energy imported in kWh
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- Powerwall Charge - Percent charge remaining in %
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- Powerwall Grid State - State of grid power
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### Switch
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The following switches are added for each Powerwall:
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The following switches are added for each Powerwall Backup Gateway:
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- Off-Grid operation - Take your Powerwall off-grid (simulate a grid outage)
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