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Add inverted power sensor for HA 2025.12 energy dashboard.

Home Assistant 2025.12 adds a new setting in the energy dashboard for " Grid power ", but it defines this power sensor as "Positive values indicate importing electricity from the grid, negative values indicate exporting electricity to the grid."

SolarEdge Export+Import meters provide a negative value when importing from grid and positive values when exporting to grid (positive for excess solar generation). This is the opposite of what Home Assistant defines for grid power.

@WillCodeForCats WillCodeForCats self-assigned this Dec 7, 2025
@WillCodeForCats WillCodeForCats linked an issue Dec 7, 2025 that may be closed by this pull request
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Holding off on merging this to see if HA frontend team accepts a PR to add this to HA so I don't have to do this.

See linked PR in issue #927.

@WillCodeForCats WillCodeForCats added the enhancement New feature or request label Dec 8, 2025
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HA Energy Dashbord Grid Power assumes incorrect polarity

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