Multi-unit charging is EV wiring for more than one car or unit — a second EV, an ADU, a duplex, or a small multi-family property — planned as one job. Load management, subpanels, and multiple circuits sized together so the Bend service is not overrun, rather than bolting on a second circuit until the panel trips.
What multi-unit wiring solves
Two Level 2 circuits is a lot of continuous load, and adding a second charger to a panel sized for one is how households end up tripping breakers. Multi-unit wiring solves it by planning the whole picture at once: whether the service carries both circuits, whether a subpanel is cleaner, and whether load-sharing equipment that lets the chargers split available capacity is the right answer for a household adding a second EV or a property owner wiring for tenants.
How a proper multi-unit install is built
A correct multi-unit install starts with one load calculation for the whole service, then decides the architecture — separate circuits, a subpanel, or load management — and sizes everything together so no single point is overrun. For an ADU or duplex it also handles the metering and where each charger lives. Done right, the chargers coexist on the service; done piecemeal, the second one is the circuit that pushes the panel over.
- One whole-service load calc. Size the architecture to the combined load, not circuit by circuit.
- Load management. Let chargers share capacity where the service cannot carry two full circuits.
- Subpanel where it fits. Add spaces and capacity cleanly for multiple circuits.
- Metering + permit. Sorted up front for ADUs, duplexes, and tenant charging; permitted and inspected.
Planned as one job
If the load calc shows the service cannot carry the added load, that is a panel or service upgrade first. Each charger is still a proper Level 2 install on its own circuit. For whether your panel needs more capacity before any of this, read do I need a panel upgrade.