FA-93045 / EV charging session scheduling / Member archive

Ready-by departure latest start: duration rounding · case 05

The session plan ends a minute before the energy is actually delivered.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Minutes. The battery must receive need_wh; the charger draws rate_w at eff_pct percent efficiency, so duration = ceil(need_wh*6000/(rate_w*eff_pct)) minutes. Latest start = depart - buffer_min - duration, rounded down to a 15-minute boundary. If that is before now, start now with status 'late'. need_wh <= 0 returns [None, now, 'done']; rate_w or eff_pct <= 0 returns [None, None, 'no-power']. Return [start, finish, status].

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: duration rounding	`[555, 1127, "ok"]`	`[555, 1128, "ok"]`	Failed

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