How does power sharing between two EV chargers work?
Power sharing connects two compatible chargers so they communicate and split the available amperage on a shared circuit. One car charging gets the full output, and two cars charging each get a portion. The system keeps the total under the breaker limit.
The chargers talk to each other over a wire or wireless link, depending on the model. They adjust output automatically as cars connect and disconnect.
This is a feature of specific chargers, so the two units usually need to be from the same family. Check the manufacturer's instructions before you buy.
Wiring between chargers is low voltage control cable in many designs, so it is a small addition to the job. Your electrician will run it through the same conduit route where possible, keeping both units tidy and avoiding extra holes in the garage wall.
Why choose load sharing instead of two dedicated circuits?
Load sharing avoids the cost and panel capacity of a second full circuit, which helps when the panel is tight or the run is long. Two cars rarely need peak power at the same time overnight, so the shared circuit often meets the household's needs.
Two 48 amp circuits would demand a lot from a panel. Sharing a single feed keeps the demand lower and may keep a panel upgrade off the table.
The tradeoff is speed. If both cars are empty, each charges slower. For many two-car Arizona households, that is fine because everything is full by morning.
In a typical Valley home with two cars in the garage, the chargers often mount a few feet apart. That short distance keeps the linking simple and the cable runs manageable for both vehicles.
What does a two-charger installation need from the panel?
A two-charger installation needs a load calculation, a properly sized breaker and wire for the shared circuit, and chargers that support power sharing. The electrician also plans conduit routing so both units sit where the cars park. Plan the conduit route and mounting spots at the same visit.
The breaker is sized at one and a quarter times the shared amperage. The wire is picked for the run and conditions, and the permit covers the whole installation.
If the load calculation is tight, a load management device or a subpanel might be added. Your electrician will lay out the options in writing.
Think about which car leaves earliest and where each one parks. Some systems let you prioritize one charger, which helps if one vehicle needs a quick top up in the morning while the other can wait.
Can I add a second charger to my existing one later?
You can often add a second charger later if the first one supports power sharing and the circuit and panel have the capacity. Planning for it during the first install is cheaper, because the electrician can size the wire and breaker with room in mind.
If you buy the first charger now, ask whether the model can be linked to a second unit. Not all can, and it is hard to change once the wall is closed up.
Even if you never add a car, the larger wire leaves headroom. We can discuss that in a written quote.
Share your daily mileage for both cars when you ask for a quote. That tells the electrician whether a shared circuit will keep up, or whether two dedicated circuits make more sense for your household.
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