Off-Peak EV Charging Savings Calculator
See how much you can save by charging your EV on a time-of-use (TOU) plan instead of a flat rate. Set your miles, efficiency, your flat and off-peak rates, and how much of your charging happens off-peak for an instant annual and monthly savings estimate.
Chargers that schedule off-peak
The savings above only happen if charging starts after the rate drops. The Emporia wall unit schedules from its app and syncs to time-of-use rates; most cars can also schedule charging themselves. Most non-Tesla EVs built before 2025 have a J1772 port; a NACS car takes the wall charger's NACS version. The portable unit plugs into an existing 14-50 outlet on a 50 A circuit with no install. It is J1772-only.
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Smart charger
Emporia Classic EV Charger
Best for: Best value in a 48 A smart charger, and tight panels via PowerSmart
Portable charger
Lectron Portable Level 2 J1772 Charger (NEMA 14-50)
Best for: Renters and second homes with an existing 14-50 outlet
Frequently asked questions
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Sources & standards
This tool's methodology and data follow US standards and authoritative public datasets: