On-board chargers, DC-DC converters and integrated power modules
From 700 W to 6.6 kW across 12 V to 560 V platforms — engineered for autonomous logistics, commercial fleets, industrial equipment and specialty vehicles. One supplier, one CAN architecture, one validation partner.
A charger for every battery, every voltage, every vehicle
We supply the whole on-board power path — and match the unit to your battery pack instead of asking you to adapt to a catalogue model.
On-Board Chargers
0.7 kW to 6.6 kW · 12 V to 560 V platforms · standalone and integrated · multi-chemistry support.
DC-DC Converters & Auxiliary
1.5 kW to 3 kW · liquid or air cooled · 12 V boost topologies · IP66 / IP67 · CAN 2.0 control.
End-to-End Infrastructure
AC wallboxes, portable DC chargers and V2L discharge guns — one partner from vehicle to charging point.
Ten active platforms
Five standalone on-board charger series, three integrated power modules and two DC-DC converter families.
Standalone On-Board Chargers
Five active series covering 700 W to 6.6 kW and 12 V to 560 V battery platforms. Pick by voltage and current — we adapt the CAN protocol, charging curve and connector to your vehicle.
Fanless 700 W charger for 12–72 V light-duty and robotic fleets
IP67 potted 850 W charger with 100+ charging curves
2 kW vehicle-mount or portable charger for 48–320 V
3.3 kW CAN-controlled charger for 48–540 V platforms
6.6 kW single-phase charger for 48–560 V trucks and platforms
Integrated Power Modules
OBC, DC/DC and PDU combined in one enclosure. Fewer boxes, shorter harnesses, one CAN node to validate.
OBC + DC/DC + PDU in one IP67 air-cooled housing
6.6 kW OBC and 1.5 kW DC/DC in one IP67 enclosure
Bidirectional 6.6 kW OBC with 3.3 kW V2L output
DC-DC Converters
Step-down converters for the 12 V / 24 V vehicle system and step-up converters that create a high-voltage bus from a low-voltage battery.
1.5 kW step-down converter for 12 V and 24 V vehicle systems
Step-up converter creating a 320 V bus from 12 V, 24 V or 48 V
Four sequential quality gates before a unit reaches your vehicle
Every unit is inspected at every gate — no sample-only checks.
Design Validation
Every new product platform runs 720 hours of continuous operation in our lab — catching design-level weakness before it reaches your vehicle.
AOI Optical Inspection
Every PCBA is scanned with a 15 µm 3CCD digital camera after SMT placement, catching solder bridging, missing components and placement offset.
ICT In-Circuit Test
Every assembled board passes ICT 518F testing with CMOS and relay static isolation before the enclosure goes on.
EOL Functional Test
Every finished unit runs high-stress functional simulation across the full voltage, current and thermal envelope it will see in the vehicle.
A real production site, built for volume
SMT lines, unit assembly, wiring and end-of-line testing under one roof in Hangzhou — these are photos of our own floor, not renders.
Units running on real vehicles
Installation photos from customer programmes — autonomous delivery fleets and commercial EV conversions already operating with GrapCharger on-board chargers.
Chassis-mounted charging on an autonomous last-mile delivery van
A sealed on-board charger installed on the chassis rail of a driverless delivery vehicle — wired to the traction pack, CAN-connected to the vehicle controller, and charging overnight from a single-phase supply. Shown here during fleet installation and commissioning.
Underframe-mounted charger with high-voltage harness integration
Production units mounted under the vehicle frame, with orange high-voltage cabling, EMC filtering and CAN communication to the VCU — the same hardware we ship in volume for light commercial platforms.
Engineering support included
Charging curve setup, CAN protocol adaptation and wiring guidance — typically within a week.
Sealed and rugged
IP66 / IP67 sealed housings with epoxy potting on selected models, designed to ISO 16750-3 vibration requirements.
Multi-chemistry support
Lead-acid and lithium profiles, plus more than 100 stored charging curves on selected models.
OEM / ODM ready
Output voltage, charging curve, CAN protocol, cable length, connectors, housing and labelling customised to your build.
Tell us your battery. We will match the unit.
Send your battery voltage window, chemistry, capacity and target current — our engineers will propose a matching configuration.