Pulls your real half-hourly electricity data and models battery savings on your actual usage shape — no assumptions.
Tip: a full month or more gives a reliable daily shape. The data comes via your Cloudflare proxy, so your API key stays server-side.
Total in range
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Daily average
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Projected annual
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×365 from your daily average
Already in night window
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23:30–05:30, before any battery
Annual battery saving
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Charged overnight, used by day.
Daytime use covered
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Share of day use the battery can shift
Effective cycles/yr
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vs the 180 we assumed before
This replaces the calculator's guessed "180 cycles" with your measured daytime load. Bigger batteries help only until they cover your typical day — you'll see the saving plateau, which tells you the right size.