FA-93283 / EV charging session scheduling / Member archive

Arrival charger matching: feasible charger preference · case 03

Short-stay vehicles take fast DC chargers that slower AC points could serve in time.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

chargers are [id, kw, free_at]; kw > 22 is DC (usable only if dc_ok, full kw), otherwise AC limited to the vehicle onboard max_ac. vehicle is [need_kwh, depart, max_ac, dc_ok]. Finish = max(now, free_at) + ceil(need*60/power) minutes. Among chargers finishing by depart pick the lowest power, then earliest finish, then id; otherwise the earliest finish (then id) with status 'late'. Return [id, finish, status] or None when no charger is usable.

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: feasible charger preference	`[1, 50, "ok"]`	`[2, 130, "ok"]`	Failed

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