Do I Need a Panel Upgrade Before Installing an EV Charger?
6 minute read
Did you know?
Before adding a Level 2 EV charger, Nexus Electrical Group can evaluate your electrical panel, complete a load calculation, and recommend any panel upgrades needed for safe, reliable home charging in Beaverton and the Portland Metro area.
You just bought an electric vehicle, or you're about to, and now you're thinking about charging at home. A Level 2 home charger is the fastest, most convenient way to start every morning with a full battery. But before any wiring goes in, there's one question worth answering first: can your electrical panel actually handle it?
For many homes in the Portland metro area, the answer is yes. For others, especially older homes in Beaverton, Tigard, Hillsboro, and the surrounding neighborhoods, the panel may need an upgrade before a charger can be safely installed. Here's how to know where you stand.
**Your main breaker is rated at 100 amps or less.** Open your panel and check the number printed on the main breaker at the top. If it reads 100 or lower, capacity is likely tight.
**Your breaker box is already full.** If every slot is taken and there's no room for a new double-pole breaker, you'll either need a sub-panel or a full upgrade.
**You have a Federal Pacific or Zinsco panel.** These brands were widely installed in Oregon homes through the 1980s and are known for reliability and safety issues. Most electricians will recommend replacing them regardless of capacity.
**Breakers trip frequently.** If you're already tripping breakers when running the dryer and the oven at the same time, adding a 40-amp EV charger will make things worse. **You're planning other electrical additions.** If a heat pump, hot tub, or workshop is also on the horizon, it makes sense to size the panel for everything at once rather than paying for two upgrades.
How Much Power Does an EV Charger Actually Need?
A standard Level 2 home charger draws between 30 and 50 amps on a dedicated 240-volt circuit. That's roughly the same draw as a central air conditioner or an electric range. Most homeowners install a 48-amp charger on a 60-amp breaker, which adds approximately 25–30 miles of range per hour of charging.
That's more than enough to fully charge overnight. The issue isn't the charger itself. It's whether your panel has enough spare capacity to support that dedicated circuit on top of everything else your home already runs.
Service Areas
Beaverton, OR | Portland, OR | Tigard, OR | Hillsboro, OR | Lake Oswego, OR | Sherwood, OR | Tualatin, OR | King City, OR
What Size Panel Do Most Homes Have?
Homes built in the Portland metro area from the 1990s onward typically have a 200-amp main panel, which generally has room for a Level 2 EV charger without any changes. If your home has a 100-amp panel, typically the ones built before the mid-1980s, and you're already running a modern appliance load, there's a good chance you'll need an upgrade before adding a 40- to 50-amp EV charger circuit.
Can I Just Use a Regular Outlet?
Every EV comes with a Level 1 charger that plugs into a standard 120-volt outlet. The tradeoff is speed:
Level 1 charging adds only about 3 to 5 miles of range per hour. For a daily commuter who drives 30 to 40 miles, that means 8 to 12 hours plugged in just to recover the day's driving.
A Level 2 charger on a dedicated 240-volt circuit is a significant quality-of-life upgrade, and for most EV owners it pays for itself in convenience within the first few months.
The Bottom Line
Not every home needs a panel upgrade before an EV charger goes in, but enough do that it's worth checking before you commit. The fastest way to find out is to have a licensed electrician run a load calculation on your existing panel. You'll get a clear answer, a realistic scope, and a plan that accounts for everything you want to add, not just the charger.
If you're in Beaverton or the greater Portland metro area, Nexus Electrical Group can evaluate your panel, handle the upgrade if it's needed, and install your EV charger, all under one contractor. We pull our own permits, coordinate with PGE, and make sure the work is done to code the first time
Contact Nexus Electrical Group today to learn more on how we can help you out or give us a call by clicking the button below
