When a load calculation shows that a home's electric service is too tight for a full-power EV charger, there are two broad ways forward. You can make the service bigger, or you can make the charger smarter so that it only uses capacity the house is not using. The second approach is called load management, and for a lot of 100 and 125 amp homes in South Florida it is the better answer. For others it is a stopgap that ends in an upgrade anyway. This guide explains the kinds of load management available, what Florida's current code says about them, and how to decide.
If you have not yet worked out whether your house is tight, start with does my panel have room for an EV charger? and the worked examples in EV charger on a 100 amp panel.
Four kinds of "load management"
The term gets used loosely. It covers four quite different things.
1. A lower fixed setting
The simplest option is not really a device at all. Many Level 2 chargers can be set to a lower maximum current, with a breaker to match. Under the 2020 NEC, which Florida uses today, adjustable settings are allowed on fixed equipment, and where the setting is protected by a tool-required cover, a lock or password-protected software, the adjusted setting may be used as the charger's rating in the calculation (NEC 625.42 text). A Tesla Gen 3 Wall Connector, for example, is configured to the breaker it is on: 24 amps on a 30 amp breaker, 32 amps on a 40 (Tesla breaker settings).
2. Sharing an existing circuit
Devices such as the NeoCharge Smart Splitter plug into an existing 240 volt receptacle, usually the dryer's, and let the dryer and car share it, with the dryer taking priority. The manufacturer lists its 14-30 model at 24 amps on a 30 amp breaker (NeoCharge 14-30 Smart Splitter). This sidesteps the service question by not adding a circuit. It raises a code question instead, which we cover in dryer outlet EV charging and splitters.
3. Sharing between chargers
Some chargers can divide one circuit's worth of power between several units. Tesla's Wall Connector power-shares across up to six units over Wi-Fi (Tesla power sharing), and Emporia advertises load sharing on its chargers (Emporia EV chargers). This solves a two-car problem, not a service problem: the pair never draws more than one circuit's worth. See two EVs, one home.
4. Whole-house monitoring
This is load management in the full sense. A sensor watches the current on the service, and the charger backs off when the house gets busy. Two examples:
- The RVE DCC-12 is a separate controller with a 60 amp relay that cuts the charger when panel load exceeds 80 percent of the main breaker rating and restores it after 15 minutes below that level (RVE DCC-12 specification sheet).
- Tesla's Universal Wall Connector supports Dynamic Power Management using a meter at the panel (Tesla Universal Wall Connector manual).
What Florida's code says today, and what is coming
Florida's current electrical code is the 2020 NEC, through the Florida Building Code 8th Edition (floridabuilding.org). The 2020 code clearly supports option 1. For option 4, how much of the charger's load a building department lets you leave out of the calculation because a monitor is installed is a local judgment under the 2020 edition, so we ask before recommending a device.
The 2023 NEC is more explicit. It sets the EV load in a calculation at the larger of 7,200 watts or the nameplate, lets an energy management system set the EV load, and adds an exception for managed chargers sharing a circuit (Leviton on the NEC 2023 EV changes). The 2023 NEC is not Florida law yet. The Florida Building Code 9th Edition is expected to take effect at the end of 2026 once adopted; check floridabuilding.org for its status.
Side by side
| Load management | Service upgrade | |
|---|---|---|
| What changes | The charger, plus a monitor or controller in some setups | Meter base, main, service conductors, often the panel |
| Utility involved | No | Yes: FPL or your city utility plans its side and reconnects |
| Power outage | Only for the circuit work | Yes, while the service is replaced and until it is inspected |
| Charging speed | Can drop when the house is busy | Full charger rating at any time |
| Room for future loads | No new capacity | New capacity for a second EV, pool heater or addition |
| Old or damaged equipment | Stays in place | Replaced |
| Code clarity under NEC 2020 | Fixed setting clear; monitoring credit is the building department's call | Straightforward |
How it plays out on a July evening
It helps to picture what whole-house monitoring actually does in a South Florida summer. You get home at 6 pm and plug in. The A/C has been running all afternoon, someone is using the electric range, and the dryer is on. With a monitor set to keep the service below its limit, the charger slows down or pauses. By 9 pm the dryer and range are off, the A/C is cycling instead of running flat out, and the charger ramps back up. By morning the car has a full day's charge. You probably never notice. The time you might notice is a day when you need a large charge in a short window during the evening peak.
That is why load management suits households that park overnight and drive a predictable distance. It suits a household that routinely needs a fast top-up at dinner time less well.
When load management is the better choice
- The house is over on paper but only modestly.
- The panel, meter base and service conductors are in good condition.
- One EV, parked overnight, with ordinary daily mileage.
- No big new loads planned: no second EV, pool heater or addition.
- The service would otherwise need utility work on a long route, such as an underground lateral under a driveway.
When a service upgrade is the better choice
- The house is well over, not just marginally.
- The equipment is old, corroded or a type we recommend replacing; see EV charging in older Florida homes.
- A second EV or another large load is likely within a few years.
- You want the full charger rating available at any time.
If an upgrade is the answer, when an EV needs a bigger electric service explains the steps, and our EV panel upgrade page covers what KRW handles.
What to ask before you buy a load management device
- Will the building department credit this device in the load calculation under the 2020 NEC?
- Is the device listed for the use, and does it work with my charger?
- Where does the sensor or meter go, and is there room in or next to my panel?
- What happens if the device loses Wi-Fi or power: does charging stop or run at full rate?
- What charging speed should I expect on a hot evening with the A/C running?
Questions homeowners ask
Is load management safe?
Listed equipment installed to the manufacturer's instructions and approved by the building department is designed to keep the service within its rating. The important part is that the device is compatible with your charger and panel, and that the inspector has signed off on it.
Will load management slow down my charging?
Only when the house is busy. Overnight, when most South Florida homes are down to the A/C cycling and a few small loads, a managed charger usually runs at or near its setting.
Can I add load management later if I upgrade now?
You can, but with a properly sized service you usually will not need it for one car. It becomes useful again if you add a second charger on the same circuit.
Does load management help during a hurricane outage on a generator?
Generator sizing is its own calculation. If you plan to charge from a generator, read generators and EV charging before deciding.
The full series is in the Florida Home EV Charging Guide. KRW Electric (EC13012832) handles EV charger installation, load calculations and service upgrades across Miami-Dade, Broward and Palm Beach, including the permit and inspection. Tell us about your panel and your car or call (305) 359-7312, and we will tell you which path fits.
Reviewed by Kyle White, KRW Electric Company LLC — licensed electrical contractor EC13012832.
