Charging leak engine
Idle reads your statement and quietly works out where your kWh spend is leaking — across public charging, memberships and your home tariff. No maps, no navigation, no pin-dropping.
Six rapid sessions where a cheaper charger sat within walking distance, two memberships that didn't break even, and a home tariff window you mostly missed.
For each rapid session, Idle checks what was open and cheaper within a short distance — same direction of travel, similar speed.
Comparisons use Zapmap-published rates at the time of your session. Tesla site availability checked against the open-to-all list.
Most EV drivers stack memberships they signed up for once and forgot. Idle checks each one against your last 90 days of charging.
Your home charger pulls 14 kWh on average, mostly between 22:30 and 01:00. Of that, roughly a third currently lands at the day rate.
| EV tariff | Off-peak | Window | Fit |
|---|---|---|---|
| Octopus Intelligent Go | 7p | 23:30–05:30 | Best fit for overnight charging |
| Octopus Go | 8.5p | 00:30–05:30 | Tighter window — fine for short top-ups |
| E.ON Next Drive | 6.7p | 00:00–07:00 | Cheapest off-peak, EV-only |
| EDF GoElectric Overnight | 8.99p | 00:00–05:00 | Standing charge slightly higher |
On your current tariff, shifting your charge start to 23:30 would move ~£28/month into the off-peak window. We don't switch you — we just show the gap.
Small things drivers wish they'd known. Built from real sessions, not reviews.
Field-tested on a Vauxhall e-Vivaro running real routes. Higher mileage, more rapid charging, more memberships, more drift. If you run a van or a small fleet, the same engine reports cost-per-mile, charger downtime patterns, and which networks quietly destroy your margin.
Idle for vans & fleetsIdle is not a charger map and does not route you. We read what you've already paid for and quietly point at the leak. Comparisons are illustrative; tariffs change.