You bought the electric vehicle, or you are about to, and now you want to charge it at home. It is one of the most common questions we hear from South Shore homeowners: can my electrical panel handle an EV charger, or do I need an upgrade first? The honest answer is that it depends on your panel, and this guide will help you understand what determines it.
At Boston Light & Power, EV charger installation is one of our most requested services across Milton and the surrounding towns. Here is how we figure out whether your existing panel is ready or whether a panel upgrade needs to come first.
How Much Power an EV Charger Actually Needs
Most home charging is done with a Level 2 charger, which runs on a 240-volt circuit, similar to an electric dryer or range. A typical Level 2 charger draws a substantial amount of current, and that draw runs for hours at a time while your car charges overnight. That sustained load is exactly why panel capacity matters so much. A charger is not a quick spike like a microwave. It is a heavy, steady demand added on top of everything else your home already runs.
The Key Question: Do You Have Spare Capacity?
Whether you need a panel upgrade comes down to two things: how much total capacity your service has, and how much of it is already being used.
1. Your Service Size
Many older homes in the area still run on 100-amp service. Once you account for existing loads like heating, air conditioning, a range, a dryer, and a water heater, there may not be enough headroom left to safely add a Level 2 charger. Homes with a 200-amp service upgrade already in place have much more room to work with.
2. Open Breaker Slots
Even if you have capacity, you need a physical open slot in your panel for the new double-pole breaker the charger requires. A panel that is already full, or one using tandem breakers to squeeze in circuits, may not have room. That is a common reason a straightforward charger install turns into a panel conversation.
3. The Age and Condition of the Panel
Some older panels, including certain brands that are no longer considered safe, should not have new high-draw circuits added to them at all. If we open your panel and find an outdated or unsafe unit, we will tell you honestly that a panel upgrade is the right move before we add an EV charger to it.
When You Can Skip the Upgrade
Plenty of homes are ready to go as is. If you have a 200-amp service, a modern panel with open slots, and reasonable existing load, we can often install your Level 2 charger without touching the panel. Not every EV charger job requires an upgrade, and we will never sell you work you do not need. The only way to know for certain is to have a licensed electrician perform a load calculation on your specific home.
What a Load Calculation Tells Us
A load calculation is the professional way to answer this question. Rather than guessing, we add up your home's actual demand and compare it to your service capacity. This tells us with confidence whether your panel can take the charger, whether a panel upgrade is needed, or whether a full 200-amp service upgrade is the smarter long-term choice, especially if you are planning other electric additions down the road.
Do It Right the First Time
An EV charger is a long-term investment in your home, and it should be installed safely and to code by a licensed professional. Skipping the panel question to save money up front is how homeowners end up with tripped breakers, an overloaded panel, or a job that has to be redone.
Boston Light & Power is a licensed Massachusetts electrical contractor (MA Master Lic. #24281-A) handling EV charger installations across Milton and the South Shore. Call (857) 855-7899 and we will assess your panel and give you a clear, honest recommendation.
24/7 Emergency Electrical Service
Electrical emergencies do not wait for business hours, and neither do we. Boston Light & Power offers 24/7 emergency electrical service across Milton and the South Shore. If you are facing a burning smell, sparks, a hot panel, or a sudden loss of power, call us right away at (857) 855-7899. Our licensed electricians are ready to respond day or night.
Frequently asked questions
Electrical Emergency? We Answer 24/7.
Burning smell, sparking outlet, hot panel or sudden power loss? Boston Light & Power provides 24/7 emergency electrical service across Boston, Milton, Quincy, Braintree, Weymouth, Hingham, Scituate and Cohasset. Licensed electricians, every hour of every day.
Call (857) 855-7899 NowThinking about home EV charging?
We will check your panel, run a proper load calculation, and tell you honestly whether an upgrade is needed before installation.
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This article is general information, not a substitute for an on-site evaluation by a licensed electrician.