Time-of-Use EV Charging Schedule Calculator

Operating conditions outside the formula

Control software, temperature, wiring loss, battery condition, and equipment limits can alter the measured electrical result — for wall energy required, the page specifically expects energy expected for the charging session.

If the next task is to estimate EV towing range from a measured or assumed range-loss percentage, continue with the EV Towing Range.

Turning the inputs into a result

Estimate whether a charging session fits inside an off-peak window and calculate energy cost — the calculation follows energy or power through one defined electrical setup.

Utility tariffs can include demand charges, taxes, or tiered pricing — that condition defines when scheduled charging cost is comparable with another result.

Wall energy required. Energy expected for the charging session — for this measurement, identify whether the reading is taken at the source, charger, battery, or accessory.

Document Charging power as average wall power while charging — this means you should identify whether the reading is taken at the source, charger, battery, or accessory.

The Off-peak window entry represents hours available at the lower price — before calculating, use one clearly defined operating interval rather than combining records from different periods.

Off-peak rate: Electricity price during the lower-rate window — a compatible entry should identify whether the reading is taken at the source, charger, battery, or accessory.

The Peak rate entry represents electricity price outside the window — before calculating, identify whether the reading is taken at the source, charger, battery, or accessory.

In “cost = off-peak energy × off-peak rate + remaining energy × peak rate,” the printed units define how each term is interpreted.

No term beyond wall energy required, charging power, off-peak window, off-peak rate, and peak rate is introduced in “cost = off-peak energy × off-peak rate + remaining energy × peak rate.”

Following one calculation through

For a numerical demonstration, retain Wall energy required = 45 kWh, Charging power = 7.2 kW, Off-peak window = 6 hr, Off-peak rate = $0.12/kWh, and Peak rate = $0.32/kWh.

Substitution into the equation gives Scheduled charging cost = $5.76, Energy completed off peak = 43.2 kWh, Energy spilling into peak = 1.8 kWh, and Total charging time = 6.25 hr.

Build another useful comparison to estimate battery energy recovered through repeated regenerative decelerations with the Regenerative Braking Energy Recovery.

Using the supporting measurement

Scheduled charging cost answers “Estimate whether a charging session fits inside an off-peak window and calculate energy cost.” The additional displays, Energy completed off peak, Energy spilling into peak, and Total charging time, are a different view of the same entered measurements.

Vehicle scheduling and power taper may alter the actual completion time — when that condition changes, compare separate calculator runs instead of blending the inputs.

Because utility tariffs can include demand charges, taxes, or tiered pricing, a disagreement between scheduled charging cost and an outside reference should trigger a review of wall energy required and peak rate.

When the vehicle decision also requires you to estimate how a continuous HVAC load changes EV range at an average speed, calculate it independently with the EV Climate-Control Range Impact.

A related vehicle record may need to estimate usable battery energy after upper and lower protection buffers, a relationship covered by the Usable Battery Capacity.

Before using this result