Charging Two EVs at Home in San Diego: Do You Need a Panel Upgrade?

More San Diego households are adding a second electric car to the driveway. That raises a fair question: if one Level 2 charger already uses a big chunk of your electrical panel, can your home handle two?

Often, yes, without replacing your main panel. The key is load management, meaning equipment that keeps the chargers' combined draw within what your home's electrical service can safely carry. Here's how it works, what your options are, and when a panel upgrade really is the right call.

Why Two Chargers Can Strain a Panel

The electrical code treats EV charging as a continuous load, because a car can pull full power for hours at a time (California Electrical Code 625.42, based on the 2023 NEC; see the 2025 California Electrical Code, in effect since January 1, 2026).

Without load management, your service and panel have to be sized for every charger running at its full rating at the same time, on top of everything else in the house. A Tesla Wall Connector on a 60-amp breaker, for example, delivers up to 48 amps, or about 11.5 kW (Tesla Wall Connector breaker table). Double that and many older San Diego homes, especially ones with smaller services, simply don't have the room on paper.

That's the case where a straight "add a second 60-amp circuit" plan runs into a load calculation that fails.

The Code Allows a Smarter Approach

The 2023 NEC, which California adopted in its 2025 Electrical Code, gives a clear path for multiple chargers. Under 625.42(A), when an energy management system (EMS) that complies with Article 750.30 controls the EV chargers, the load counted on your service and feeder is the maximum the EMS allows, not the sum of every charger's nameplate rating (NEC 625.42 text and 2023 changes).

In plain terms, if the chargers are listed to talk to each other and cap their combined current, the load calculation can be based on that cap. Section 625.42(B) also allows chargers with restricted-access adjustable amperage settings to be rated at their adjusted setting.

Your Options for Charging Two EVs

Option 1: Power sharing between two chargers

This is the most common answer for two-EV homes. Two chargers are installed, and they share a set amount of power. When only one car is plugged in, it can charge at that charger's full allowed rate. When both are plugged in, the available power gets split between them.

Tesla Wall Connector Power Sharing. Tesla's Gen 3 Wall Connectors (all Gen 3 variants) support a firmware feature Tesla calls Group Power Management, or Power Sharing. Up to six Wall Connectors can be linked over Wi-Fi, with one unit acting as the "leader" that allocates current to the others. The installer sets a total network limit so the group never pulls more than the electrical installation can handle (Tesla: Wall Connector Power Management; Tesla: Group Power Management Commissioning).

Tesla notes that the chargers can share a single circuit or be on separate circuits, and that one circuit feeding multiple Wall Connectors can be the most cost-effective setup when the parking spot is far from the panel (Tesla). The minimum is 6 amps per Wall Connector.

Other brands. Some other hardwired Level 2 chargers offer their own load-sharing features. They generally only share with compatible units, so mixing brands usually means losing the sharing feature. We'll confirm compatibility for the exact models before you buy.

Option 2: Whole-home load monitoring (one charger)

If you only need one charger but your panel is tight, Tesla's Dynamic Power Management uses a Tesla-approved meter installed in your panel to watch total household load in real time. When the dryer and water heater are running, the car charges slower; when the house is quiet, such as overnight, it charges faster (Tesla: Dynamic Power Management).

Tesla currently supports this feature only on single Wall Connector installs, not across a Power Sharing group (Tesla Dynamic Power Management overview). It can still be a good fit for households where two cars take turns on one charger.

Option 3: Turn down the charger's amperage

A charger can be set to a lower output on a smaller breaker. Tesla's own table shows a Wall Connector on a 40-amp breaker delivering 32 amps (about 7.6 kW) (Tesla breaker table). For many commuters, a lower overnight rate still refills the day's driving. Whether that's enough depends on how far each of you drives.

Option 4: Panel or service upgrade

Sometimes the load calculation says your service just doesn't have the headroom, even with load management, or you're also planning a heat pump, an induction range, or a battery. That's when a main panel upgrade makes sense. Our post on whether a Tesla Wall Connector needs a panel upgrade covers the signs.

How to Figure Out Which Option Fits Your Home

It comes down to a few questions we answer on a site visit:

• What's your service size and current load? A load calculation shows how much capacity is really available.
• How much do you each drive? Daily miles decide how much charging power each car actually needs overnight.
• Do both cars need to charge at the same time? If not, one charger may be enough.
• Where do you park? A long run from the panel can make a single shared circuit more practical.
• What else is coming? Planning for solar, a Powerwall, or new electric appliances now avoids doing the work twice.

Permits Still Apply

Adding a second charger or new circuit is electrical work that needs a permit and inspection in San Diego, just like the first one. The load calculation filed with the permit is where load management gets documented. See our guide to EV charger permits in San Diego for how the City and County process works.

Why Work With LTBL Energy

LTBL Energy is a licensed California electrical contractor (CSLB #1136922) and a Tesla Certified Installer for the Tesla Wall Connector and Powerwall. We do the load calculation, set up power sharing or load management correctly, pull the permit, and meet the inspector. If a panel upgrade really is needed, we handle that in-house too. Learn more about our EV charger installation services.

FAQ

Can I install two EV chargers on one electrical panel? Often, yes. With a power-sharing or load-management setup, the load calculation can be based on the system's controlled maximum instead of both chargers at full power, which may avoid a service upgrade.

Can two Tesla Wall Connectors share one circuit? Yes. Gen 3 Wall Connectors support Tesla's Power Sharing (Group Power Management), which lets up to six units share power on one circuit or across several, within a limit the installer sets.

Will each car charge slower with power sharing? Only when both are charging at the same time. When one car is plugged in, it can charge at that charger's full allowed rate.

Can I mix a Tesla Wall Connector with another brand and still share power? Tesla's Power Sharing works between Gen 3 Wall Connectors. Other brands typically only share with their own compatible units, so plan on matching chargers if you want sharing.

Do I need a permit for a second EV charger? Yes. A new charger or circuit needs an electrical permit and inspection.

Get Both EVs Charging at Home

Not sure whether your panel can handle two EVs? Request an EV charger installation quote or call or text LTBL Energy at 619-592-6097, and a real person will get back to you.