DC Fast ChargersAll-in-One
Zerova DSWA122A08 DC Fast Charger Manual
Setup, everyday use, maintenance and troubleshooting for the 120 kW DC fast charger, with verified specifications.
- Max output120 kW
- ConnectorsCCS + NACS
- Outputs2
- Efficiency94%
About the Zerova DSWA122A08
The Zerova DSWA122A08 is a 120 kW DC fast charger certified under the ENERGY STAR program for electric vehicle supply equipment. It offers a maximum available output of 120 kW (up to 155 A), with 2 charging outputs using CCS and NACS (SAE J3400) connectors.
As an all-in-one unit, the power electronics, controls and cables are housed in a single cabinet at the parking space. It is rated for a 480 V three-phase supply.
Its average loading-adjusted conversion efficiency is 94%. With no vehicle connected it draws 68.0 W.
It is network capable over Ethernet with OCPP support. Equipment includes an RFID card reader and a high-resolution display.
Specifications
| Brand | Zerova |
|---|---|
| Model number | DSWA122A08 |
| Configuration | All-in-One |
| Maximum available output | 120 kW |
| Maximum output current | 155 A |
| Charging outputs | 2 |
| Connector types | CCS, NACS (SAE J3400) |
| Supply type | AC input |
| Rated input voltage | 480 V |
| Input phase | Three Phase |
| Output cable length | 15 ft |
| Average loading-adjusted efficiency | 94.0% |
| Power factor at full load | 0.99 |
| Standby power, no vehicle connected | 68.0 W |
| Idle mode power | 217 W |
| Network capable | Yes |
| Network connection | Ethernet |
| OCPP support | Yes |
| Demand-response (connected) capable | Yes |
| Credit card reader | No |
| RFID reader | Yes |
| High-resolution display | Yes |
| ISO 15118 (PLC) communication | No |
| Revenue-grade meter | No |
Safety information
- DC fast chargers operate at hazardous voltages — a 480 V three-phase supply and a DC output of several hundred volts. Only qualified electrical workers trained by the manufacturer should open the enclosure, and only after lockout/tagout and verification of zero energy, following NFPA 70E or the equivalent workplace electrical-safety rules.
- Installation must comply with the National Electrical Code (NEC Article 625 and related articles) or the Canadian Electrical Code, the manufacturer's installation manual and local requirements. Permits, inspections and utility approval are required.
- Know where the emergency stop and upstream disconnects are, keep them unobstructed and clearly labeled, and train site staff to use them.
- Take an output out of service immediately if its cable jacket is cut, the connector is cracked or pins are damaged, or the holster is broken. Do not attempt field repairs to cables or connectors.
- Keep cables off the ground and coiled on their holsters or cable-management systems so they are not driven over or become a tripping hazard.
- Drivers should use only connector adapters approved by their vehicle manufacturer, and never force a connector into a port.
Installation and site planning
A DC fast charger is a site project rather than a simple appliance installation. Plan for utility coordination, electrical design by a licensed engineer or electrical contractor, civil work and commissioning by a manufacturer-certified technician. At 120 kW output on a 480 V three-phase supply, input current at full load is on the order of 154 A (a rough estimate from output power and efficiency) — use the nameplate input rating in the installation manual for conductor and overcurrent sizing, which the NEC requires to be at least 125% of the continuous load.
- Engage the utility early
Request a service evaluation for the added load (120 kW for this unit). Many sites need a new service or transformer, and lead times can be long. Ask about commercial EV rate options and demand charges, which often dominate operating cost.
- Design the site
Lay out stalls so the 15 ft cables reach charge ports on either side of typical vehicles, include accessible stalls and routes as required by accessibility rules, and add bollards or wheel stops, lighting, signage and space for maintenance access around the cabinet.
- Prepare foundations and conduit
Build the concrete pad and conduit runs to the manufacturer's drawings, including anchor-bolt patterns and minimum clearances for cooling airflow.
- Set and wire the equipment
Set the cabinet(s), terminate the supply conductors and grounding to the specified torque, and install any separate communication cabling. Only qualified electricians should perform this work.
- Commission
A manufacturer-certified technician performs start-up checks, verifies insulation and protective functions, updates firmware and runs test sessions with a vehicle or load bank.
- Activate network and payment
Connect the charger to its network (Ethernet) and register it with the OCPP-compliant management platform, then configure pricing, access control.
- Inspect and open
Pass the electrical inspection, then publish the site to charging-network maps and apps so drivers can find it.
Using your DC fast charger
Driver charging session
- Select the correct connector — this unit offers CCS and NACS (SAE J3400) — and insert it fully into the vehicle's port.
- Authorize the session by tapping an RFID card or starting the session in the network app.
- The charger and vehicle check the connection and insulation before energizing; charging then ramps up automatically.
- Stop the session from the screen, the app or the vehicle, wait for the connector to unlock, and return it to its holster.
What determines charging speed
- The vehicle requests the power; the charger supplies up to 120 kW, but most cars accept less than that, especially at high states of charge.
- Charging is fastest at low battery levels and tapers significantly above roughly 80% state of charge, so stopping at 80% frees the stall sooner.
- Very cold or hot batteries charge more slowly until the vehicle conditions them; preconditioning on the way to the charger helps.
- With 2 outputs, the 120 kW maximum is the unit's total available power. When more than one vehicle charges at once it may be divided between them; the manual describes the power-sharing scheme.
- High ambient temperatures or blocked cooling vents can cause the charger to reduce output to protect its components.
Remote monitoring
Use the network platform to watch charger status, session data and fault alerts, and to take part in utility demand-response programs (the model is listed as demand-response capable). Set up alert notifications so faults are seen and dispatched quickly — uptime is the most important performance measure for a public fast charger.
Care and maintenance
| When | What to do |
|---|---|
| Daily or weekly | Walk the site: check connectors, holsters and cables for damage, clear debris and confirm screens and status lights are working. |
| Every month | Clean connector faces and holsters with a dry or lightly damp cloth (never a pressure washer), clean the display, and test a charging session on each output. |
| Every 3–6 months | Inspect and clean or replace air filters and check that cooling intakes and exhausts are clear, as the manual specifies. Check enclosure door seals and cable-management hardware. |
| Every year | Qualified technicians perform preventive maintenance per the manufacturer's schedule — typically power-connection torque checks, thermal imaging, cooling-system service, protective-function tests and firmware updates. |
| After any vehicle impact | Take the unit out of service and have it inspected, even if damage looks cosmetic. |
Keep a maintenance log and track uptime by output. Many manufacturers and network operators offer service agreements that include remote diagnostics and guaranteed response times.
Troubleshooting
Many fast-charging problems originate on the vehicle side or in communications. Check the basics below, then escalate to the service provider with the fault code and time of the event.
| Problem | Possible cause | What to try |
|---|---|---|
| Session will not start | Authorization failed; charger offline from its network; connector not fully seated. | Retry authorization or use another method; check network status; reseat the connector and wait for the handshake to complete. |
| Charging slower than expected | Vehicle's own limit or high state of charge; cold battery; power shared with another output; thermal derating. | Compare with the vehicle's charging curve; check whether another vehicle is charging; inspect cooling vents and filters. |
| Session stops unexpectedly | Insulation or ground-fault check failed; communication error between vehicle and charger; vehicle requested stop. | Restart the session once. If the same fault repeats, record the fault code and take the output out of service for inspection. |
| Payment or card reader not working | Terminal offline; reader dirty or damaged. | Check the terminal's network link; clean the reader; offer an app or RFID alternative while it is repaired. |
| Charger shows offline | Cellular, Wi-Fi or Ethernet connection lost; backend outage. | Check the modem or router and signal strength; contact the network operator. Some chargers continue local operation while offline. |
| Display dark or unreadable | Display or control power fault; very high ambient light. | Check status through the network platform; contact service if the display has failed. |
| Connector hot or damaged | Wear, contamination or mechanical damage. | Take the output out of service immediately and have the cable assembly replaced by a qualified technician. |
| Fault code displayed | Brand-specific diagnostic code. | Fault codes are not standardized; consult the code table in your manufacturer's manual or service portal. |
Energy use and running costs
With no vehicle connected the Zerova DSWA122A08 draws 68.0 W. If it sat in that state around the clock, it would use about 596 kWh a year — roughly $101 at $0.17 per kWh. Commercial electricity prices vary widely, so substitute your own rate. That standby draw is lower than 60% of the 188 All-in-One models in our database.
At an average loading-adjusted efficiency of 94%, the charger draws about 106.4 kWh from the grid for every 100 kWh it delivers to vehicles. At a site delivering 300 kWh a day (an illustrative figure — roughly 8 to 10 typical sessions), conversion losses come to about 6,989 kWh a year, or $1,188 at $0.17/kWh.
For most commercial sites, utility demand charges — billed on the highest power drawn in a billing period — can outweigh energy charges. Power-management settings, staggered sessions and on-site storage can reduce peak demand.
Frequently asked questions
How powerful is the Zerova DSWA122A08?
Its maximum available output is 120 kW, with up to 155 A of output current. The actual charging rate depends on what each vehicle can accept and its battery's state of charge.
What connectors does the Zerova DSWA122A08 have?
The certification lists CCS and NACS (SAE J3400) connectors across its 2 outputs. NACS (SAE J3400) is the connector originally developed by Tesla and now being adopted across North America.
Can the Zerova DSWA122A08 charge two vehicles at once?
It has 2 outputs. The 120 kW figure is the unit's total available power, which may be shared when several vehicles charge simultaneously; check the manual for how power is allocated.
What electrical service does the Zerova DSWA122A08 need?
It is rated for a 480 V three-phase supply. A rough estimate of full-load input current is 154 A; the nameplate rating and the installation manual govern circuit sizing, which must be at least 125% of the continuous load. Utility coordination is usually required.
How efficient is the Zerova DSWA122A08?
Its average loading-adjusted efficiency is 94%, meaning about 6.0% of the input energy is lost as heat in conversion.
Does the Zerova DSWA122A08 accept credit cards and connect to a network?
It is network capable (Ethernet) and supports OCPP. A credit card reader is not listed in the certification data.
How long are the charging cables on the Zerova DSWA122A08?
The certification lists an output cable length of 15 ft. Lay out stalls so the cable reaches charge ports on either side of typical vehicles.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified dc fast chargers dataset published by the U.S. Environmental Protection Agency (record certified August 28, 2025), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with Zerova. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact Zerova or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
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