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Solar & Electricity Calculator
Planning estimates, reviewed October 2026 — flat-rate math on your figures, not DISCOM slabs or a site survey. Confirm tariffs and sizing with your bill and vendor.
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Runtime is stored energy times the usable fraction, divided by load: a 150 Ah × 12 V bank holds 1800 Wh, of which 85% usable is 1530 Wh — on a 200 W load that is 7.65 hours. Lower usable percent correctly means fewer hours, because the derating multiplies the stored energy rather than dividing by it.
Enter amp-hours and voltage for stored Wh, the steady load in watts, and a usable percent that matches chemistry — around 50% for lead-acid, deeper for lithium. Then treat the answer as a ceiling and size with margin: conversion losses, ageing, and cold weather all shave real runtime, so plan critical loads against 70–80% of the figure.
It does not model depth-of-discharge curves, Peukert losses at high draws, ageing, or temperature — one steady load against a derated bank, with real-world margin as your responsibility.
Optimistic ceiling — size with margin for DoD and ageing.
No. Lead-acid batteries are typically drawn to about 50% and lithium deeper; plan around usable, not rated, capacity.
Conversion losses, ageing, and depth-of-discharge limits all reduce practical runtime below the ideal.
Roughly — doubling the load halves the hours — and slightly worse, because high draws lose extra energy to heat (Peukert effect).
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