"Does my panel have room for an EV charger?" sounds like one question. It is really two, and the answer to one does not tell you the answer to the other. The first is whether the panel has physical space for another breaker. The second is whether the house's electric service has capacity for a load that can run at full power for hours every night. You can check the first yourself in a few minutes. The second needs a load calculation, but you can gather almost everything an electrician needs for it with a phone camera.
This guide walks through both, using what you can safely see without removing any covers. Do not take the inner cover (the dead front) off the panel. Everything below is visible with the door open.
Step 1: find the service size
Open the panel door and look for the largest breaker, usually at the top, sometimes on its own at the bottom or in a separate box beside the meter outside. The number on its handle is the main breaker rating: 100, 125, 150 or 200 on most South Florida homes. That number is the ceiling for the whole house.
If there is no large breaker in the panel, look outside. Many Florida homes have the main disconnect in a meter-main combination at the meter, with the indoor panel fed from it. If you find fuses instead of breakers anywhere, stop here and read our guide on EV charging in older Florida homes, because a fuse panel changes the conversation.
Step 2: count the spaces
A Level 2 charger or a NEMA 14-50 receptacle needs a two-pole breaker, which takes two adjacent spaces in most residential panels. Look for knockouts (blank metal tabs) in the dead front. Two open spaces next to each other is the simple case.
No spaces does not mean no charger. Depending on the panel, an electrician may be able to:
- replace some full-size single-pole breakers with tandem breakers, where the panel label allows them in those positions;
- move a few circuits to a small subpanel;
- remove breakers for circuits that no longer serve anything, which is common in homes that have been remodeled.
None of these add capacity. They only make room. That is why Step 3 matters more.
Step 3: list the big loads
In a South Florida house, a handful of appliances account for most of the load. Walk through the house and note which of these you have, and whether they are electric or gas:
| Load | What to note | Why it matters |
|---|---|---|
| Central A/C | Tonnage or the model number on the outdoor unit | Usually the largest load; runs most of the year |
| Air handler heat strips | Whether the air handler has electric heat | Counted against the A/C in the calculation |
| Water heater | Electric or gas; tank size | An electric tank heater is a large fixed load |
| Range or cooktop and oven | Electric or gas | Electric cooking adds a large nameplate load |
| Dryer | Electric or gas | Electric dryers run on a 30 amp circuit |
| Pool pump and pool heater | Present or not; heat pump pool heater | Pool heat pumps are significant loads |
| Hot tub, well pump, workshop | Present or not | Each adds to the total |
Two houses with identical 100 amp panels can land in very different places. A small house with gas cooking and gas water heating often has room for a charger. An all-electric house of the same size with a pool may not.
Step 4: understand how the electrician checks capacity
Florida is on the 2020 National Electrical Code through the Florida Building Code 8th Edition (floridabuilding.org). For an existing house, NEC 2020 gives two ways to check whether a service can take a new load.
- A calculated load. General lighting from the square footage, the kitchen and laundry circuits, and the nameplates of fixed appliances are added up; the first 8,000 VA counts in full and the remainder at 40 percent; then the A/C or heat is added at full rating (EC&M on dwelling load calculations).
- Measured demand. If a year of maximum-demand data for the service exists, the existing load can be taken from it, with a 125 percent factor, plus the new load (UpCodes, determining existing loads).
The EV charger's share is set by its rating. EV charging is a continuous load, so the breaker must be at least 125 percent of the charger's maximum current: 32 amps needs a 40 amp breaker, 40 amps needs 50, 48 amps needs 60 (Mike Holt, NEC Article 625 summary).
A quick worked example
Here is a made-up but typical case, to show how the pieces fit. The numbers are illustrative, not a substitute for a calculation on your house.
A 1,400 square foot, 1970s house in Broward has a 125 amp main, gas water heater, electric range, electric dryer, a dishwasher and a 3 ton A/C. The general loads come to 26,900 VA: 4,200 for lighting (3 VA per square foot), 3,000 for two kitchen circuits, 1,500 for laundry, and nameplates of 12,000 for the range, 5,000 for the dryer and 1,200 for the dishwasher. Applying the demand factor: 8,000 VA plus 40 percent of 18,900 VA is 15,560 VA. Adding an A/C of about 5,000 VA gives 20,560 VA, or roughly 86 amps at 240 volts. That leaves about 39 amps of the 125.
Now add a charger set to 32 amps (7,680 VA). In the general loads it adds 40 percent of 7,680, about 3,070 VA, bringing the total to about 23,630 VA, or 98 amps. Comfortable. If the building department asks for the charger to be counted at its full rating instead, the total is about 28,240 VA, or 118 amps: still inside 125, but with little room for anything else. That difference is one of the questions we ask the building department before recommending a charger size.
Step 5: the photos to send
You can save a visit, or at least make the first one count, by sending these:
- The whole panel with the door open, straight on.
- The label inside the door (the panel brand, model and rating are on it).
- A close-up of the main breaker handle.
- The meter and the equipment around it outside, including any disconnect.
- The nameplate on the outdoor A/C unit.
- Where you park, and where you would like the charger.
Also tell us the charger or car you have, and anything planned: a second EV, a pool heater, an addition. If a second car is likely, read two EVs, one home: power sharing before choosing the first charger.
What the answer usually looks like
- Room on the service and spaces in the panel: a dedicated circuit and the charger. Each EV outlet needs its own individual branch circuit (Leviton on NEC 625.40).
- Room on the service, no spaces: panel work to make space, then the circuit.
- Tight on the service: a lower charger setting or a load management device. See EV load management vs a panel upgrade.
- No room, or equipment in poor condition: a panel or service upgrade. See panel upgrades for EV chargers.
Questions homeowners ask
My panel has empty spaces. Doesn't that mean it has room?
It means there is space for a breaker. Whether the service can carry the charger depends on the loads already on it, which a load calculation shows. Empty spaces and spare capacity are separate things.
Can I add up the breaker numbers to see if I am over?
No. Breakers on most homes add up to far more than the main rating, and that is normal, because not everything runs at once. The code's calculation methods account for that. Adding up breakers will make almost every house look overloaded.
Should I buy the charger before the electrician visits?
You can, but it is often better to wait. If the service is tight, a charger that can be set to 24 or 32 amps, or one with built-in load management, may avoid an upgrade. Many chargers are adjustable, and on fixed equipment with restricted access the adjusted setting can be used as the rating (NEC 625.42 text).
Is it safe for me to take the panel cover off to look?
No. The inner cover protects you from energized parts. Everything a first assessment needs is visible with the door open and from outside.
For the full picture, start at the Florida Home EV Charging Guide or see how we handle EV charger installation. KRW Electric (EC13012832) serves homes in Miami-Dade, Broward and Palm Beach. Send us your panel photos or call (305) 359-7312, and we will tell you which of the four answers above is yours.
Reviewed by Kyle White, KRW Electric Company LLC — licensed electrical contractor EC13012832.
