Panel Upgrades for EV Charging
Adding a Level 2 charger means adding a big, steady load to your home. If your electrical panel is already working hard, it may need an upgrade to take it safely — or it may not. Here's how to tell, what it costs, and the cheaper alternatives worth asking about first.
It's about capacity, not just the number on the panel
People assume a 100A panel always needs upgrading and a 200A panel never does. Neither is true. What matters is how much of your service is already spoken for by the AC, water heater, oven and everything else. An electrician adds it up with a load calculation, then sees whether a 40–60A charging circuit fits. That number, not a rule of thumb, decides it.
Signs an upgrade may be on the cards
- •A 100A service in a home with electric heat, AC and an electric range
- •A panel that's already full — no open breaker slots
- •Frequent breaker trips when big appliances run together
- •Knob-and-tube or a fuse box still in service
- •An older home that's never had its service updated
Before you pay for a full upgrade
Ask your electrician about a load-management device. These let the charger run on your existing service and automatically ease off when the rest of the house is drawing hard — often a few hundred dollars instead of a few thousand. It won't fit every home, but it's worth ruling in or out before committing to new service.
FAQ
How do I know if I need a panel upgrade?▾
It comes down to spare capacity, not just panel size. An electrician runs a load calculation: they add up what your home already draws and see whether there's room for a 40–60A charging circuit. Plenty of 100A panels have room; plenty of 200A panels are surprisingly full. The calculation is what settles it.
How much does a panel upgrade cost?▾
A 100A-to-200A service upgrade typically runs about $1,500 to $4,000, depending on the meter, the run to the utility, and local permit fees. It's the single biggest variable in an EV charger budget, which is why a good electrician checks for it before quoting.
Is there a way to avoid a full upgrade?▾
Often, yes. A load-management device (sometimes called a DCC or a smart splitter) lets the charger share an existing circuit and back off when the house demand spikes — far cheaper than a new service. A subpanel can also work. Whether either fits depends on your setup.
Are there rebates that help with the cost?▾
Several utilities specifically rebate the wiring or panel work for an EV charger — some cover $1,000 or more. Check your state on our rebates pages to see what's available where you live.
See which incentives cover panel and wiring work in your state on our rebates pages.
Find out what your panel needs
A licensed electrician can run the load calculation and tell you whether an upgrade, a load manager, or neither is the right move.