Do You Really Need a 200-Amp Panel Upgrade for Your EV Charger?
If you're getting ready to install a Level 2 EV charger at your home in Toronto, Aurora, or Tottenham, chances are someone has already told you that you need to upgrade your electrical panel to 200 amps first. It's one of the most common things homeowners hear — and it's not always true.
At Milestone Electrical Ltd, we see this assumption cost homeowners thousands of dollars in unnecessary panel upgrades every year.
The truth is, whether you need an upgrade depends entirely on how much spare capacity your home's electrical service already has — and there's a precise, code-recognized way to find that out before you spend a dime on new equipment.
Why 'Just Upgrade to 200 Amps' Isn't the Right First Step
A Level 2 EV charger typically draws between 30 and 48 amps on a dedicated 240-volt circuit.
Plenty of homes with 100-amp or 125-amp services have more spare capacity than people assume. Jumping straight to a panel upgrade without checking the numbers could mean paying $3,000–$5,000 for work that a much smaller installation could have solved safely.
The Better Way: A Proper Load Calculation
A licensed electrician should perform a load calculation before recommending any panel upgrade.
This can be completed using the standard worksheet method or, where permitted, historical utility demand data under Rule 8-106(8), which often provides a more accurate picture of your home's real electrical demand.
How to Get Your Historical Usage Data
Toronto Hydro and Alectra Utilities both provide historical interval usage (Green Button) data. We can help you obtain this information as part of your EV charger load calculation.
How the Math Works
Take the highest hourly demand over the past 12 months, add a 25% safety margin, convert the value to amps, and compare it to your panel rating. This identifies how much spare capacity is available for an EV charger.
Every home is different, which is why a proper calculation matters.
What This Means for You
Many homeowners can install a dedicated EV charging circuit without upgrading their panel. If your panel is near capacity, we'll explain all available options, including panel upgrades, load management devices, or alternative charger configurations.
Frequently Asked Questions
Do I need a 200-amp panel?
Not necessarily.
How do I know my spare capacity?
By having a licensed electrician perform a load calculation.
Is historical utility data allowed?
Yes, where applicable under Rule 8-106(8).
What if my panel is full?
Load management systems or a panel upgrade may be appropriate depending on the results.
Not Sure If You Need a Panel Upgrade?
Don't spend thousands on a 200-amp panel upgrade until you know it's actually necessary.
At Milestone Electrical Ltd, we perform professional, Ontario Electrical Safety Code-compliant load calculations to determine whether your existing electrical service can safely support a Level 2 EV charger. In many cases, homeowners discover they already have enough available capacity—saving time, money, and unnecessary work.
If a panel upgrade is required, we'll explain exactly why, walk you through your options, and recommend the solution that's right for your home—not the most expensive one.
Contact Milestone Electrical Ltd today to book your EV charger load calculation or request a free estimate.