Most people buy the charger first and think about the circuit second, which is backwards. The charger is the easy decision — what your panel can support, and where the car parks, decides almost everything else. Here's how we walk homeowners through it.
Amperage: 40 amps covers nearly everyone
A Level 2 charger on a 50-amp circuit delivers 40 amps continuous, roughly 30 miles of range per hour. Overnight that's far more than a typical day of Flagstaff driving. A 48-amp unit needs a 60-amp circuit and heavier wire, and only makes sense if you drive long distances daily or have a very large battery.
Faster isn't automatically better. It costs more in wire, breaker, and panel capacity to shorten a charge you sleep through anyway.
Check the panel before anything else
A charger is one of the largest continuous loads in a house. A 100-amp service with electric heat or a well pump often can't take one without either a load calculation that says otherwise, a load-management device, or a panel and service upgrade. On a 200-amp panel with open spaces, it's usually straightforward.
Hardwired or plug-in
A NEMA 14-50 receptacle lets you unplug and take the unit with you, and it's convenient if you might move. Hardwiring is required for 48-amp units, is generally more reliable long-term, and avoids the failure mode we see most: cheap 14-50 receptacles overheating under daily continuous load. If you go plug-in, insist on an industrial-grade receptacle.
Garage, carport, or outdoors
Northern Arizona winters matter here. Choose a unit rated for the temperature range and for outdoor use if it won't be in a garage, keep the cable off the ground where it can freeze into ice, and mount the unit so the cable reaches the car's port without stretching. Measure with the car parked how you actually park it.
Features worth paying for — and skipping
- Worth it: scheduled charging for off-peak rates, a 25-foot cable, a solid three-year-plus warranty.
- Worth it if your panel is tight: load management or a power-sharing model.
- Usually skippable: app ecosystems, screens, and cloud features that stop working when the vendor does.
When to bring in a professional
The install itself is usually a half-day when the panel has room. Getting the circuit, location, and mounting right the first time is what makes it a fifteen-year appliance instead of a callback.
Call (928) 563-6237 and we'll check your panel capacity and give you a firm number before you order a charger.