Adding an EV Charger at Home in Phoenix: What Has to Be True First

It starts with a load calculation

A Level 2 charger is a large, continuous load — it runs at close to its full draw for hours at a stretch, which is different from a dryer or an oven. The code has a defined method for calculating whether your existing service can carry an added load like that, accounting for everything else in the house. Any electrician who skips this step and just says “yeah, we will put it on a 50” is guessing with your service.

The Phoenix wrinkle: your AC

In most of the country the biggest load is heating. Here it is cooling, and it runs at the same time of day you are most likely to be charging. That is exactly why the calculation matters rather than a rule of thumb borrowed from a milder climate.

Your options if the service is tight

• Charge at a lower amperage — most cars and chargers let you set a limit, and overnight hours are usually plenty even at a reduced rate.
• Use a load-management device or an energy-management system so the charger and the big loads cannot run simultaneously.
• Upgrade the service. Worth it if the panel is old anyway or you have other plans.
• Feed a sub-panel near the garage, if the service has room but the panel does not.

Practical details people forget

• Cable length and where the car's port actually is — measure with the car parked how you park it.
• Garage temperature. Equipment must be rated for where it is installed, and Phoenix garages are hot.
• Outdoor installs need equipment rated for wet locations and sunlight exposure.
• GFCI and disconnect requirements vary with the equipment and the location.
• Hardwired versus a receptacle changes the requirements, and sometimes the rebate eligibility.
• Permits and inspection. This is a new circuit; it gets a permit.

On rebates and incentives

Utility and government incentive programs for home charging exist and change often, including their requirements about who does the work. We will tell you what we know, but confirm the current terms directly with your utility before counting on a specific amount — we would rather you get a straight answer than a stale one.