Why are overnight electricity rates lower in the Phoenix area?
Overnight rates are lower because demand on the grid drops after the evening peak, when air conditioning is running hardest. Utilities price power higher during the peak window and lower off-peak to encourage use when the system has spare capacity.
Summer afternoons and evenings in the Valley are the busiest hours. Charging then adds to the strain and often to your cost.
Peak and off-peak hours differ between plans and seasons. Look at your plan documents rather than relying on a general rule.
Your thermostat habits and pool schedule matter here as well. If the pool pump and the car both run in the evening, shifting one of them can keep the overall bill down on a time of use plan.
Do I need a special plan to get night rates?
You need a time of use or EV specific plan from your utility to get lower night rates. A standard flat plan prices all hours alike. Compare plans carefully, since the plan applies to your whole home, not only the charger.
A plan that saves on charging can cost more on other usage, depending on your habits. Review a year of your bills if you can.
Some plans or programs use a separate meter or the charger's data. Ask the utility what is required.
Winter and summer rates can differ, and so can the peak hours. A plan that looks good in July may look different in January, so review the full year schedule instead of one season.
How do I set my EV to charge at night?
Most EVs and many chargers let you schedule charging in the car's screen or an app, so charging starts after off-peak hours begin. Set the departure time and the start time, and confirm they match your utility's off-peak window. Check the settings again after any power outage.
Some chargers have a built-in timer. Use one or the other, not conflicting schedules in both.
Check that the schedule works after a power outage, as monsoon storms can interrupt the settings on some units.
Keep the charger limit in mind. If your daily need is modest, a lower amperage setting may still finish within the off-peak window and put less strain on the panel.
Does a home charger setup affect how much I save?
Yes, a properly sized Level 2 charger finishes a full charge within the off-peak window, which a slow outlet may not. A dedicated circuit installed by a licensed electrician keeps charging safe and lets you set an overnight schedule. It fits your daily mileage and the off-peak window.
A charger that is too slow for your mileage spills into peak hours. Match the amperage to how far you drive.
Check current APS or SRP terms for plans and incentives. Vortech installs the circuit for the charger you buy; contact us for a written quote.
Smart chargers that report usage help you see what overnight charging actually costs. That information beats guessing, and it helps when you compare plans or apply for a utility program.
Need an EV Charger Installed?
Vortech installs Level 2 home chargers across Phoenix, Glendale, Peoria, Sun City, Sun City West and Surprise. See EV charger installation or read the full guide on this topic.
More questions: Home EV Charger Installation: 12 Most Asked Questions Answered