UL 9741 is the North American safety standard for bidirectional EV charging system equipment — chargers that charge a car from the grid and can also send power back to a building or the grid. A one-way charger is listed against the ordinary supply-equipment standards. Equipment that exports power needs this extra evaluation, because a charger that can feed energy back is judged as a power source, not only a load — a fact recorded in the listing file behind the UL or ETL mark.
Key Takeaways
- UL 9741 is the North American safety standard for bidirectional EV charging equipment.
- Exporting power makes the charger a source, not just a load — including never energising a dead circuit.
- The listing builds on the one-way family (UL 2594, 2231, 2251); check the file names 9741.
- A listed charger is one of three gates: the car must support export, and the premises needs approval.
Why Sending Power Back Needs Its Own Standard
An ordinary charger has one job: take power from the building and deliver it to the car until the session ends. A bidirectional charger adds the return trip: the same box behaves like a small power plant on your wiring, pushing energy into circuits built to receive it, and possibly out to the grid.
That changes the safety questions. Exporting equipment must coordinate with the premises it feeds, shut down cleanly on faults, and stop exporting the moment the grid fails — never energising a circuit that the owner, or a line worker repairing the outage, believes is dead. None of that is part of charging, so UL wrote a separate standard.
| Direction | What the equipment does | The safety question |
|---|---|---|
| Charging only | Draws power from the building into the car | Is the load controlled, and are people protected? |
| Exporting | Draws power out of the car into the building or grid | Could it energise wiring that should be dead, or feed power the premises cannot take? |
How UL 9741 Sits in the UL Family
A bidirectional unit still has to charge, so its listing builds on the one-way family. Each standard keeps its own job:
| Standard | Covers |
|---|---|
| UL 2594 | The charging equipment itself — cord sets and fixed charging stations |
| UL 2231 | Personnel protection systems in EV supply circuits |
| UL 2251 | Plugs, receptacles, vehicle inlets and connectors |
| UL 9741 | Bidirectional charging system equipment — the same box, judged on exporting power as well as taking it |
One listing file can name several standards at once. Our guide to UL and ETL listing for EV chargers explains how that process works.
A Listing Is Only One of Three Gates
Even a fully listed bidirectional charger cannot export power on its own. Three things have to line up:
- The equipment gate. The charger’s listing names UL 9741 for the exact model.
- The car gate. The vehicle itself must be built to export power; most EVs cannot. Our guide to which EVs can do bidirectional charging covers the car side, and our bidirectional charging explainer sets out V2L, V2H and V2G.
- The premises gate. Feeding a home or the grid also needs the utility’s agreement and an installation to local code — separate from the listing. A listed charger is not permission to connect.
What It Means When You Buy
- Ask which standards the listing names. For a bidirectional unit, UL 9741 should appear in the file for the exact model — listings vary by model and configuration, so ask for that model’s certificate, as our certifications explained guide recommends. A file naming only one-way standards covers charging, not export.
- Read “V2G-ready” claims carefully. Ready can describe the hardware alone. The listing, a car that can export, and the utility’s approval are still three separate gates.
EVDANCE’s current range moves power in one direction — into the car. The EV-AC03201T dual-connector AC station serves two vehicles at up to 43 kW shared with OCPP 1.6J controls, and the EV-RHDC30K-L compact DC fast charger delivers 22 kW DC. For brands planning a bidirectional line, that listing has to name UL 9741; our OEM and private-label program starts at 100 units.
Frequently Asked Questions
Does a UL 2594 listing already cover bidirectional charging?
No. UL 2594 evaluates supply equipment that delivers power to the car. Sending power back out is the job UL 9741 adds: if 9741 is not named, the listing covers charging only.
Do I need UL 9741 for vehicle-to-load (V2L)?
V2L runs appliances from the car’s own outlet and is a vehicle feature; it does not wire fixed equipment into your premises or the grid. UL 9741 concerns bidirectional charging equipment in the premises setup — the V2H and V2G side.
Is UL 9741 used outside North America?
No. It belongs to the North American listing system run through OSHA-recognised laboratories. Other markets use their own frameworks, so a listing earned for one market does not transfer.
Related Reading
- Bidirectional Charging Explained: V2L, V2H and V2G
- Which EVs Can Do Bidirectional Charging?
- UL and ETL Listing for EV Chargers: How NRTL Certification Works
- EV Charger Certifications Explained: CE, UKCA, UL, ETL, CB
