Charging cost (£) — home estimated at 3.5p/kWh, network is Tesla's actual billed amount
Home (est.)Supercharger / network (actual)
Home charging cost, off-peak only (22:00–06:00, 3.5p/kWh)
A "charge" sums all home kWh from sessions starting in that overnight window — a narrower view than the cost chart above, which covers all hours.
Overnight battery change (00:00–07:00)
Positive = charge lost overnight. Negative = it charged during that window. Nights the car stayed asleep the whole time have no reading to compare, so they're omitted.