Load management helps an apartment building add more chargers by capping the total power all its chargers may draw together, then sharing that total between the cars plugged in. The building’s supply stays the limit, but it is the managed total — not the sum of every charger’s full rating — that has to fit inside it. That is how a car park can offer ten bays on a supply that could never run ten full-rate chargers.
Key Takeaways
- A capped, shared total — not the sum of full ratings — sets how many bays a building can add.
- Apartments suit sharing: cars park overnight, and energy by morning beats peak speed.
- Equal split, rotation, priority and scheduled starts are settings within the same cap.
- The arrangement is set by the installation design and a licensed electrician — not by any single charger.
The Problem: Full Ratings Add Up Faster Than Buildings Do
Without management, every charger is wired as if it will run at full power all night. EV charging is a continuous load, so under the NEC the breaker is sized at 125% of the charger current: a 32 A charger needs a 40 A breaker, a 40 A charger a 50 A breaker. Six 32 A chargers therefore claim 240 A of panel capacity before the building’s own loads. Older buildings rarely have that much spare, and a larger utility supply is major work. A licensed electrician’s load calculation establishes the spare capacity; load management is how it serves more cars.
| Question | Without load management | With load management |
|---|---|---|
| How is each bay sized? | Full rating, permanently | One capped total, shared by the group |
| What limits the number of bays? | Spare capacity divided by the full rating | The cap, the parked hours, and each car’s needs |
| What happens when every bay is busy? | Impossible beyond the sized count | Each car charges slower; all still charge |
| How do you add bays later? | Often only with a supply upgrade | By extending the managed group |
Why Apartments Are the Easy Case: The Overnight Window
Load management works best where cars stay parked for many hours — and residents’ cars do exactly that, evening to morning. A car needing a set amount of energy back does not care whether it arrives in three hours at full rate or across the night at a shared rate — only that it is ready by morning. That long window is what the building is really selling: not peak power, but enough hours. Our guide to charging an EV when you live in an apartment covers the wider options.
The Sharing Patterns a Building Chooses From
The cap is fixed; how it is divided is a settings decision:
- Equal split. Every connected car receives the same share — simple and predictable.
- Rotation. Cars take turns at a higher rate, finishing sooner in sequence.
- Priority. Designated bays or users are served first; the rest share what remains.
- Scheduled start. Sessions begin when the building’s other loads fall, avoiding its peak.
What a driver sees on a busy night is covered in our article on whether load balancing increases charging speed. The arrangement itself is installation design — chargers, control equipment and settings a licensed electrician specifies under local code.
Hardware for Shared Apartment Bays
For shared bays, the EV-AC03201T dual-connector AC station serves two bays from one unit — up to 43 kW shared, 22 kW per connector — with RFID access and OCPP 1.6J, so both connectors work inside the building’s managed design and every session is tied to a user. Its 7-inch touchscreen is the session display, not a payment terminal. For assigned spaces, the EV-ACT3204PE 22 kW Type 2 wallbox adds RFID and app control per bay. The building-wide cap, though, is created by the installation design and its control equipment, not by any one charger — confirm it with your installer in writing. The full range is on our commercial charging page.
Frequently Asked Questions
Does load management make each car charge more slowly?
When every bay is in use, yes — each car receives a share rather than the full rate. Overnight, that rarely matters: cars need a set amount of energy, not a set speed.
Do we still need an electrician’s load calculation?
Yes — management works inside the spare capacity the calculation confirms; it does not create capacity. The electrician sets the cap accordingly.
Can load management be added after the first chargers are in?
It depends on the installed equipment. Buildings expecting to grow should choose chargers and controls that support managed sharing from wave one, and confirm the expansion path before signing off.
Related Reading
- Apartment and Condo EV Charging: Solutions for Shared Parking
- How to Charge an EV When You Live in an Apartment
- What Is Dynamic Load Balancing, and Why Does Your Wallbox Home Charger Need It?
- Can I Have an Electric Car Charger at Home? Houses, Rentals and Condos
