Free EV Charging Tool

EV Tariff Optimizer

Find the cheapest time to charge your electric vehicle under time-of-use rates. Save up to 60% on every kWh.

Vehicle & Charger

Enter your battery and charger specs.

Time-of-Use Rates

Add your tariff periods. All 24 hours must be covered.

Recommended Charging Window

OPTIMAL
Configure your inputs to see results.
Best start
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Session cost
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Energy drawn
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Cost vs. on-peak —

24-Hour Cost Map

Charging cost if the session started at each hour.

Range
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Best start hour Other hours

Charging Summary

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Frequently Asked Questions

What is the cheapest time to charge an EV on TOU rates? +
The cheapest time to charge an EV under time-of-use rates is typically during off-peak hours, which for most utilities fall between 11 PM and 7 AM. Charging during this window can be 40–70% cheaper than on-peak daytime rates because grid demand is lowest overnight.
How much money can I save by optimizing my EV charging schedule? +
By shifting EV charging from on-peak to off-peak hours, most drivers save between $200 and $600 per year depending on battery size, charging frequency and local tariff differentials. Large batteries charged daily see the biggest savings, often exceeding 60% per kWh compared to on-peak charging.
How does the EV Tariff Optimizer calculate the best charging window? +
The optimizer divides the day into hourly slots using your TOU rates, then simulates charging from every possible start hour. It sums the per-hour cost based on the tariff active at that hour and picks the start time that delivers your required kWh at the lowest total cost, factoring in charger power and session length.