Do I Need a Panel Upgrade for an EV Charger?
It is the most common question we get from homeowners thinking about EV charger installation. The answer depends on your panel's amperage, available capacity, and existing electrical load. This guide walks you through everything you need to know — plainly, without jargon.
The Short Answer
If your main breaker says 200A: You probably do not need a panel upgrade. Most 200A panels have enough capacity for an EV charger circuit.
If your main breaker says 100A (or less): You may need a panel upgrade, depending on your existing electrical load. A load calculation will confirm.
If you have a fuse box: You almost certainly need a panel replacement before adding an EV charger.
How Much Power Does an EV Charger Need?
A Level 2 EV charger typically draws between 24 and 48 amps of continuous power from a 240V circuit. The most common setups:
| Charger Amperage | Breaker Required | Typical Chargers | Range per Hour |
|---|---|---|---|
| 24A | 30A breaker | Grizzl-E (24A mode) | ~25 km/hr |
| 32A | 40A breaker | ChargePoint Home Flex, FLO Home | ~35 km/hr |
| 40A | 50A breaker | ChargePoint Home Flex (50A mode) | ~40 km/hr |
| 48A | 60A breaker | Tesla Wall Connector (max output) | ~50 km/hr |
Per the Canadian Electrical Code, continuous loads must not exceed 80% of the circuit breaker's rating. That is why a 48A charger requires a 60A breaker (48 / 0.8 = 60).
The question is: does your panel have enough spare capacity to accommodate a 30A–60A breaker for the EV charger, on top of everything else already connected?
100A Panel vs. 200A Panel: What's the Difference?
100A Panel
- Common in homes built before the mid-1990s
- Total capacity: 100 amps shared across entire home
- After existing loads (HVAC, dryer, stove, hot water), may have only 20–40A spare
- Adding a 40–60A EV circuit often exceeds safe capacity
- Panel upgrade usually recommended
200A Panel
- Standard in homes built after 2000
- Total capacity: 200 amps shared across entire home
- After existing loads, typically has 60–100A+ spare
- Adding an EV charger circuit usually fits within capacity
- Panel upgrade usually not needed
How to Check Your Panel's Amperage
- 1
Find your electrical panel
Usually in the basement, utility room, or garage.
- 2
Look at the main breaker at the top of the panel
It will be labelled with the amperage — typically 100, 125, or 200. This is your panel's total capacity.
- 3
Take a photo and send it to us
Send a clear photo of your panel (door open, showing breakers) to us on WhatsApp. We can give you a quick assessment within minutes.
Signs You Probably Need a Panel Upgrade
Your main breaker is rated at 100A or less
All breaker slots in your panel are full — no room for a new circuit
Breakers trip frequently, especially when running high-draw appliances
Your home still has a fuse box instead of a breaker panel
You have aluminum wiring connections or a Federal Pacific / Zinsco panel
You are planning to add other high-draw loads (heat pump, hot tub, workshop)
Your home was built before the 1980s and still has the original panel
Signs You Probably Do NOT Need a Panel Upgrade
Your main breaker is rated at 200A
Your panel has available breaker slots
Your home was built after 2000 with modern electrical infrastructure
You do not run many high-draw appliances simultaneously
A load calculation confirms sufficient spare capacity
What Is a Load Calculation?
A load calculation is the standard method electricians use to determine whether your electrical panel can safely support additional circuits. It accounts for:
- Your panel's total amperage capacity
- All existing circuit breakers and their loads
- Fixed appliances: HVAC, electric stove, dryer, hot water tank
- General lighting and receptacle loads
- The proposed EV charger circuit
If the calculated total load exceeds 80% of the panel's rated capacity, a panel upgrade is required to maintain safe operation and code compliance. We perform this calculation for every home before recommending any work.
This is not guesswork. It is a standardized calculation defined by the Canadian Electrical Code (CEC). Any licensed electrician should perform this before installing an EV charger on a panel that may be near capacity.
The Load Management Alternative
In some cases, a full panel upgrade can be avoided by installing a load management device (also called an EVEMS — EV Energy Management System). These devices monitor your home's real-time electrical usage and automatically adjust charger output to keep the total load within safe limits.
Pros
- • Lower upfront cost than a full panel upgrade
- • Faster installation — no utility coordination needed
- • Allows EV charging on a 100A panel
Cons
- • Charging speed reduces during peak household usage
- • Does not solve underlying capacity limitation
- • Not ideal if you plan to add more electrical loads
- • Not suitable for all homes — depends on load profile
We assess whether load management is a viable option for your specific situation. For some homeowners, it is a practical alternative. For others, a panel upgrade is the better long-term investment — especially if other electrical upgrades are planned.
What Does a Panel Upgrade Include?
A 100A to 200A panel upgrade from ConnectEV Inc. includes:
Detailed load calculation
New 200A electrical panel with modern breakers
All existing circuits transferred to new panel
Proper circuit labelling
Utility coordination for service upgrade (if needed)
ESA permit application
ESA inspection coordination
Clean, professional installation
When combined with EV charger installation, we complete both in the same visit — one scope, one price, one project. Learn more about our 200A panel upgrade service.
Panel Upgrade Cost in Ontario
A 100A to 200A panel upgrade in Ontario typically costs $2,500–$5,000 depending on:
- Condition and age of your existing panel and wiring
- Whether the utility needs to upgrade the incoming service
- Complexity of the installation (accessibility, location, existing work)
- Number of circuits being transferred
- Local permit and inspection fees
We provide a clear, detailed quote after reviewing your setup. No hidden fees, no surprises.
Beyond EV Charging: Why a Panel Upgrade Is a Good Investment
A panel upgrade is not just about the EV charger. It future-proofs your home's electrical system for:
- Heat pumps and electric heating systems
- Hot tubs and pool equipment
- Workshop and power tools
- Renovations that add electrical load (kitchen, basement)
- Home insurance compliance — many insurers flag older 100A panels
- Improved resale value
Related Pages
Panel Upgrades & EV Charger Installation in:
Not sure if you need a panel upgrade?
Send us a photo of your electrical panel on WhatsApp. We will tell you what you need — honestly and quickly.
Free assessment. No obligation. Honest advice.