On-Board Chargers (OBC)

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On-Board Chargers (OBC)

AC-to-DC charging power from 700 W to 6.6 kW for 12 V to 560 V battery platforms, in fanless, forced-air or liquid-cooled constructions, with a bi-directional V2L variant.

  • Power class: 0.7 / 0.85 / 2 / 3.3 / 6.6 kW
  • Input: 1-phase 90 – 264 V AC · DC input option
  • Output platform: 48 – 560 V DC
  • Cooling: Fanless · forced air · liquid
  • Ingress rating: IP66 / IP67
  • Compliance: UNECE R10 · ISO 26262 on request

Key benefits

One family, 12 V to 560 V

Low-voltage fanless units cover 12 – 72 V platforms for two- and three-wheelers, utility and marine; the 3.3 kW and 6.6 kW units cover 48 – 560 V for passenger and commercial vehicles. Output is set in software within each model's window, so one unit serves several pack voltages in a family.

Cooling chosen by the vehicle, not by us

Below 1 kW the units run fanless and sealed, which removes the single most common wear item. From 2 kW upward we offer forced air or a liquid plate. Liquid-cooled units hold rated power in a packed engine bay; forced-air units drop the coolant loop for cost-sensitive and retrofit platforms. Both share the same control software and CAN map.

Bi-directional without a second box

The GC-BID-6.6KW-2KW reuses the primary power stage for the reverse path and delivers up to 3.3 kW of 220 VAC for V2L. That removes a dedicated inverter, the harness that feeds it, and the extra cooling it would need.

Description

The on-board charger converts AC from the grid or a wallbox into regulated DC for the traction battery. Grapcharger platforms use a two-stage topology — an active power factor correction front end followed by an isolated DC-DC stage — which keeps input current sinusoidal, holds power factor above 0.99 at rated load and limits harmonic distortion back into the supply.

Charging is controlled over CAN by the vehicle, or through a hard-wired enable line where a platform has no charger CAN node. Output is constant-current then constant-voltage, with the charge profile supplied by the BMS. The bi-directional variant adds a grid-forming stage for V2L duty.

Technical specifications

Parameter Value / Condition
Rated output power 0.7 kW · 0.85 kW · 2 kW · 3.3 kW · 6.6 kW
Input voltage range AC 90 – 264 V, 1-phase ( 130 – 400 V DC input option on the 2 kW unit )
Input frequency 45 – 65 Hz
Power factor ≥ 0.99 at rated load
Output voltage range 48 – 560 V DC, set per model and platform
Control interface CAN 2.0B (125 / 250 / 500 kbit/s) or enable line
Protections Output OVP, OCP, short circuit, reverse polarity; input UVP / OVP; over-temperature

Configuration options

Power Battery voltage AC input Cooling Bi-directional
700 W 12 / 24 / 36 / 48 / 72 V 90 – 135 or 180 – 264 V Fanless —
850 W 24 / 48 / 60 / 72 V 90 – 264 V Fanless, potted —
2 kW 48 – 320 V 90 – 264 V · DC 130 – 400 V Forced air —
3.3 kW 48 – 540 V 90 – 264 V Forced air or liquid —
6.6 kW 48 – 560 V 90 – 264 V Forced air or liquid —
6.6 kW 240 – 450 V 90 – 264 V Liquid V2L 3.3 kW
Parameter Value / Condition
Operating temperature -40 °C to +85 °C
Storage temperature -40 °C to +105 °C
Cooling Fanless ( below 1 kW ) · forced air · liquid
Ingress protection IP66 / IP67 depending on model
Shock & vibration Designed to QC/T 895 and ISO 16750-3
Dimensions & mass Per model datasheet and 2D drawing
Parameter Value / Condition
Full-load efficiency ≥ 92 % (0.7 – 0.85 kW) · ≥ 93 % ( 2 kW ) · ≥ 94 % ( 3.3 – 6.6 kW )

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Applications

  • Passenger cars
  • Light commercial vehicles
  • Buses and coaches
  • Off-highway and construction
  • Two- and three-wheelers
  • Marine and RV
  • Stationary storage

FAQ

Can one charger cover my battery voltage?

Yes within a model's window. Output is specified as a range rather than a fixed value — the 3.3 kW unit covers 48 – 540 V and the 6.6 kW unit covers 48 – 560 V — so one model serves several pack voltages across a platform family. The BMS supplies the charge profile over CAN.

Do I need a coolant loop?

Only for liquid-cooled variants. Forced-air units are rated for the same ambient envelope but de-rate at high power, so the choice is really about installed power density and what the vehicle already has.

What does the charger need from the vehicle?

A CAN node (or a single enable line), the DC contactors, and the cooling circuit where applicable. We supply the DBC and the charge-profile interface specification.

Which models support bi-directional operation?

The GC-BID-6.6KW-2KW. It charges at 6.6 kW and reverses to deliver up to 3.3 kW of 220 VAC 50 Hz for V2L, with a 2 kW DC-DC stage in the same liquid-cooled housing. V2G grid-code compliance depends on the destination market and is engineered per programme.

Downloads

OBC datasheets, 2D drawings and 3D STEP files
Full electrical characteristics, derating curves, connector pin-out and CAN matrix.

Open download centre

Related resources

Related products

DC-DC ConvertersHV to LV step-down, 1.5 kW – 3 kW.2-in-1 Integrated UnitsOBC plus DC-DC in one housing.3-in-1 Power UnitsOBC, DC-DC and PDU, with EVCC option.

Models in this series

GC-OBC-700W — 700 W Fanless IP66 On-Board ChargerView specifications, model matrix and FAQGC-OBC-850W — 850 W IP67 Potted On-Board ChargerView specifications, model matrix and FAQGC-OBC-2KW — 2 kW Vehicle-Mount or Portable ChargerView specifications, model matrix and FAQGC-OBC-3.3KW — 3.3 kW CAN On-Board Charger, 48–540 VView specifications, model matrix and FAQGC-OBC-6.6KW — 6.6 kW CAN On-Board Charger, 48–560 VView specifications, model matrix and FAQ