Claude/grid cost credit calc e9z al - #1
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Implements a tariff system that calculates grid import costs and export credits based on configurable time-of-use windows. Uses a hybrid approach: cumulative kWh counter deltas when available (most accurate), falling back to trapezoidal integration of instantaneous power for cross-day boundaries. - tariff/tariff.go: Config model with timezone, day-of-week, and time window matching for both import and export tariffs - tariff/calculator.go: Energy bucketing engine that queries readings, computes per-window kWh, and multiplies by configured rates - growatt/store.go: QueryRangeReadings for multi-day cost queries - main.go: `growud cost` CLI subcommand with --date/--from/--to flags - server/server.go: /api/cost JSON endpoint for web dashboard - paths.go: TariffPath added to AppPaths for tariff.json resolution - tariff.example.json: Example config with peak/shoulder/off-peak rates https://claude.ai/code/session_01HEKBz4fG3L7uJCZS2r4Jvq
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