Plan for two nights. A long-range car that rolls home at about 10% with a 100 kWh-class battery needs roughly 90 kWh to fill — about ten and a half hours on the EV-ACS4005T at its full 9.6 kW, before the slow top end stretches it further. That is longer than any normal night: night one charges for tomorrow, night two finishes.
Key Takeaways
- A 100 kWh-class car arriving at 10% needs about 90 kWh — roughly 10.5 hours at 9.6 kW, more than one night.
- Night one targets tomorrow’s driving (about 80% on the example); night two finishes in about two and a half hours.
- A short DC fast stop on the way home is the shortcut that changes night one.
- All times are worked examples with about a tenth added for losses; the top of the pack charges slowest.
The Arithmetic of Arriving Nearly Empty
Most overnight planning assumes the 20–80% window, the fast part of the battery. Arriving home from a trip breaks that assumption: you start below the window and, if a full battery matters, aim above it. The figures below are worked examples at the full 40 A setting (9.6 kW), with roughly a tenth added for losses. The stretch toward 100% slows as the car tapers, so treat that column as a floor, not a promise.
| Battery size (example) | From 10% to 80% | From 10% to 100% |
|---|---|---|
| 75 kWh | About 52.5 kWh — roughly 6 hours | About 67.5 kWh — roughly 7.5 to 8 hours |
| 100 kWh | About 70 kWh — roughly 8 hours | About 90 kWh — roughly 10.5 hours, plus taper |
Our general guide to how long it takes to charge an EV at 7 kW, 11 kW and 22 kW shows the same division at other power levels. Notice: a 75 kWh car just fits inside a long night, a 100 kWh car does not — the difference is the battery, not the charger. At 9.6 kW this unit sits near the top of the U.S. DOT’s Level 2 band of 7–19 kW, so no trick changes the division.
Night One: Charge for Tomorrow, Not for Full
The mistake is seeing a finish time after your departure and treating it as a failure. Split the job on purpose:
- Run the full 40 A setting on the charger’s home circuit — a 50 A circuit by the pairing in our guide to how many amps an EV charger needs. Tonight is not the night for a lower setting.
- Set a target, if your car offers a charge limit. On the 100 kWh example, eight hours delivers about 70 kWh — roughly 80% by morning.
- Leave it plugged in until you leave. As our article on leaving an EV charging overnight covers, staying connected after the target is reached is normal practice.
Night Two, and the Shortcut That Changes Night One
Night two starts where night one stopped. From about 80%, the remaining 20 kWh on the 100 kWh example takes roughly two and a half hours — an easy session, after which daily top-ups are short again. Charge to a genuine 100% only when the next trip needs it, and follow your car maker’s guidance on sitting full.
One shortcut shrinks night one: arrive home with more in the battery. A short DC fast stop on the way home works in a different band entirely — the U.S. DOT puts DC fast charging at 50–350 kW — so a brief stop can lift the car to a level one home night can finish. The two-night plan is a choice, not a trap.
The EVDANCE EV-ACS4005T is a 40 A NACS portable charger: 9.6 kW from a NEMA 14-50 plug, 16/24/32/40 A settings for smaller circuits met when travelling, an IP66 enclosure and a 25 or 28 ft cable. At home, its ceiling is a fixed input to your planning — the plan above is how a big battery works around it.
Frequently Asked Questions
Can the EV-ACS4005T fill a 100 kWh battery overnight?
From 20% to 80%, yes — about 60 kWh, roughly seven hours at 9.6 kW. From near empty to full, no: about 90 kWh plus the slow top end runs past a normal night.
Should I charge to 100% on both nights?
Night one’s target is tomorrow’s driving, not a number. Charge to full when a trip needs the range, and follow your car maker’s guidance for everyday charge levels.
Would a 48 A wallbox solve this?
It shortens, but does not repeal, the arithmetic: at 11.5 kW the same refill is still roughly eight and a half hours with losses. The EV-ACT5006T 48 A wall charger is the step up if your nights are routinely this tight; for an occasional post-trip refill, the two-night plan costs nothing.
Related Reading
- Can You Leave an EV Charging Overnight?
- How Long Does It Take to Charge an EV at 7 kW, 11 kW and 22 kW?
- How Many Amps Does an EV Charger Need?
