Should I Upgrade My Electrical Panel Before Installing an EV Charger?

Electric vehicles are becoming a common sight in Sacramento driveways. Between California’s push toward zero-emission transportation and the sheer convenience of waking up every morning with a “full tank,” more homeowners are making the switch. But, once the car is in the garage, you might wonder what you need for an EV charger installation.

The answer almost always involves your electrical panel. And depending on how old your home is or how much electrical load you’re already running, it may mean an upgrade before a single charger gets installed.

Here’s what you need to know before your EV charger project gets started.

First: Why Does the Panel Even Matter?

Your electrical panel (also called a breaker box or load center) is the central hub that distributes power throughout your home. Every circuit in your house, from your refrigerator to your HVAC system, draws from it.

A Level 2 EV charger (the kind most homeowners install for overnight home charging) typically requires a dedicated 240-volt circuit with a 40- to 60-amp breaker. That’s a meaningful chunk of power (roughly equivalent to adding a large electric dryer or central air conditioner to your electrical system).

If your panel doesn’t have the capacity to support that additional load, you’ll have a problem. And in Sacramento’s older housing stock, that’s a very real possibility.

What Size Panel Do You Currently Have?

Electrical panels are rated in amps, and that rating tells you how much total power your home can draw at once. The most common ratings you’ll encounter are:

• 100-amp panels: Common in homes from the 1960s through the 1980s. May be sufficient for a L1 EV charger, but it depends heavily on what else is running in the home.
• 150- to 200-amp panels: The modern standard for most homes. Usually has enough capacity for an EV charger, though an electrician still needs to verify available space and load.
• 200-amp panels with high electrical demand: Homes with electric HVAC, water heaters, hot tubs, or other high-draw appliances may be running close to capacity even with a 200-amp panel. These situations require a careful load calculation.

The bottom line: panel size alone doesn’t tell the full story. What matters is how much of that capacity is already spoken for.

The Load Calculation: What It Is and Why It Matters

Before any licensed electrician installs an EV charger, they should perform a load calculation. During this process, they will review your home’s total electrical demand to see your panel’s capacity.

This involves looking at:

• The wattage of your HVAC system
• Your water heater type (electric vs. gas)
• Kitchen and laundry appliances
• Any other high-draw circuits already in use
• The square footage of your home

If the calculation shows your panel has enough available capacity, you may be able to add a charger with minimal panel updates. If it shows you’re already close to the limit, adding a 40- to 60-amp circuit could push you over, and that’s where a panel upgrade becomes necessary.

Signs You Probably Need a Panel Upgrade

Beyond the numbers, there are warning signs that your panel may be overdue for an upgrade regardless of the EV charger question, including:

• Breakers that trip frequently, especially under normal household loads
• Lights that dim when large appliances kick on
• A panel that uses fuses instead of circuit breakers
• A Federal Pacific or Zinsco panel (these have well-documented safety concerns and are typically recommended for replacement)
• No available breaker slots for an electrical circuit upgrade
• Your panel is more than 25 to 30 years old

Any one of these is a reason to have a licensed electrician evaluate your panel. Several of them together, and an upgrade should be near the top of your home improvement list, EV charger or not.

Your EV Charger Options and Their Power Requirements

Understanding what you’re actually installing helps clarify the panel conversation. There are two realistic home charging options:

Level 1 Charging (120V)

L1 EVSE uses a standard household outlet and requires no electrical upgrades at all. The catch: it’s slow. Most EVs gain only 3 to 5 miles of range per hour on Level 1, meaning a depleted battery could take 24 to 40 hours to fully charge. For drivers with short daily commutes who can leave the car plugged in overnight regularly, it’s workable. For most people, it’s frustrating.

Level 2 Charging (240V)

This is the setup most homeowners want. A Level 2 charger delivers 15 to 30 miles of range per hour, meaning most EVs charge fully in 4 to 8 hours overnight. It requires:

• A dedicated 240-volt circuit
• Typically a 40- to 60-amp breaker 
• hardwired charger unit
• Available panel capacity

Level 2 is the practical choice for almost every EV owner, but it demands more from your electrical system.

What a Panel Upgrade Actually Involves

If your home does need a panel upgrade, here’s what to expect from the process:

• Permit and inspection: In California, panel upgrades require a permit and must be inspected by the local building department. 
• Utility coordination: Upgrading from a 100-amp to a 200-amp service often requires coordination with SMUD or PG&E (depending on your Sacramento-area location) to upgrade the service entrance. This adds some scheduling time to the project, but it is a routine process utilities handle regularly.
• Timeline: Most panel upgrades can be completed in a single day for the electrical work, with the inspection and utility coordination adding 3 – 4  additional weeks.
• Cost vs. value: Panel upgrades costs will depend on your situation; however, in almost every case, they add resale value to your home, improve safety, and create capacity for future upgrades like solar, battery storage, or additional EV chargers.

California Incentives Worth Knowing About

Before you finalize your budget, look into available incentives. California and local utilities offer programs that can offset the cost of EV charger installation and sometimes panel upgrades:

• SMUD customers in the Sacramento area may qualify for rebates on EV charger equipment and installation through SMUD’s EV programs.
• PG&E customers in surrounding areas have similar rebate programs for both 
• panel upgrades and Level 2 charger installation.
• Federal tax credits may be available for EV charger equipment through the Alternative Fuel Vehicle Refueling Property Credit. Consult a tax professional for current eligibility.

These programs change periodically, so it’s worth exploring current offerings before your project begins.

When to Call a Licensed Electrician

The short answer: before you buy the charger.

An electrician can evaluate your panel, run the load calculation, and give you an honest picture of what your installation will actually require. That conversation prevents surprises (like discovering mid-project that your panel needs replacement) and ensures the work is done to code the first time.

Choose Bonney for EV Charger Installation Near Me

Not every EV charger installation requires a panel upgrade, but every installation requires an honest evaluation of your panel first. The age of your home, your current electrical load, and the charger you plan to install all factor into the answer. Get that assessment done early, understand your options, and you’ll be pulling into a fully charged car every morning before you know it.

At Bonney, our licensed electricians handle EV charger installations and panel upgrades throughout the Sacramento area. We’ll assess your current setup, walk you through your options, and get the job permitted and inspected properly from start to finish. Schedule online or explore our coupons, and we’ll help you charge smarter.