AC and DC chargers are built on different lines because one conversion step sits in different places. An AC charger passes alternating current through to the car, and the car’s onboard charger converts it to DC for the battery. A DC charger does that conversion inside the station, with power electronics the AC unit never carries. That one difference changes the components, the weight, the test equipment and the power the test bay needs.
Key Takeaways
- The conversion step is the split: in the car for AC charging, inside the station for DC.
- DC lines add power modules, cooling, heavy assembly and a test bay that can run units at full output.
- AC lines are bench-scale, high-volume control-and-protection assembly with modest test loads.
- Factories that build both run separate lines — ask which line builds the model you are sourcing.
What Each Line Actually Builds
An AC unit is control and protection around a pass-through path: a control board running the session, a contactor, residual-current protection, metering, and the cable or socket. Assembly is board work, wiring and enclosure fitting — bench-scale work on units one person can lift. A DC unit adds the conversion hardware: power modules that rectify AC to DC, DC contactors, insulation monitoring, and cooling to move conversion heat out of a much larger cabinet. The result is a heavier product, built at floor stations, with heavy cabling and busbar work an AC line never sees. The U.S. DOT’s charger types and speeds overview sets out the same split from the driver’s side: Level 2 delivers AC at 7–19 kW, while DC fast charging delivers DC at far higher power.
Side by Side: Where the Lines Differ
| Line element | AC charger line | DC charger line |
|---|---|---|
| Core build | Board assembly, wiring, enclosure, cable or socket fit | Power-module mounting, heavy cabling and busbar work, cabinet assembly, cooling fit |
| Handling | Bench work; units one person can carry | Floor stations, lifting aids, more floor space per unit |
| Final test | Function, protective-device trip, pilot signalling, insulation and earth tests against a modest load or vehicle simulator | The unit must run at rated power into a suitable load, with insulation monitoring checked |
| Test-bay power | A bench supply sized for one unit’s AC rating | A supply and load rated for the charger’s full DC output |
| Run-in | Functional checks and, where specified, a short aging run | Longer full-power runs to prove modules and cooling under sustained heat |
| Safety regime | Standard electrical production safety | Added high-voltage DC and stored-energy procedures, including discharge checks |
Why Factories Specialise — or Split the Lines
The test bay is the clearest reason. Proving a DC charger means feeding and loading it at full output, so the factory’s electrical infrastructure, load equipment and floor space are built around that; an AC line needs none of it. Skills split the same way: AC production leans on control electronics and high-volume assembly, DC production on power electronics, thermal work and cabinet building. Volumes point the same direction — AC units are smaller and ship in larger numbers, while DC units are heavier and costlier (U.S. DOE figures put public DC fast-charging equipment far above Level 2). A factory that builds both usually runs separate lines with separate test bays under one roof — a good question to test on any factory audit, and the reason our comparison of Level 1, Level 2 and DC fast charging matters to buyers as well as drivers.
Both Families at EVDANCE
The EVDANCE range spans both lines: AC portables and wallboxes such as the EV-ACT5006T 48 A Level 2 wall charger, the dual-connector EV-AC03201T AC station, and the compact EV-RHDC30K-L DC fast charger at 22 kW DC with OCPP 1.6J. The full range is on the products page. When you source a model, ask which line builds it and what its end-of-line test runs — the honest answer differs by family. Start through contact us.
Frequently Asked Questions
Can an AC charger factory simply start building DC chargers?
Part of the skill transfers — enclosures, wiring discipline, final-test habits. The real step is elsewhere: a power-electronics supply chain, cabinet and cooling work, and a test bay that can feed and load units at full DC output. Treat the claim as a capability to audit.
Why does the test bay matter to a buyer?
Because end-of-line testing is where defects are caught before they become your warranty claims. A DC line whose test bay cannot run units at rated power is shipping unproven hardware.
Does a combined factory mean one line builds both?
Usually not: assembly, handling and test infrastructure differ enough that combined factories run separate AC and DC lines, sometimes in one building. Ask which line builds your model.
Related Reading
- Level 1 vs Level 2 vs DC Fast Charging: A Practical Comparison
- EV Charger Factory Audit Checklist for Importers
- Chinese EV Charger Manufacturers: Factory, Trading Company or Marketplace Seller?
- OEM and Private-Label EV Chargers: A Complete Guide for Brands
