Book Appointment Now
800V PTC Coolant Heater for Electric Bus
For high-voltage bus projects: confirm the complete operating-voltage window before selection.
An electric bus heater must be rated for the voltage it actually sees throughout operation. The A-series PTC coolant heater is listed at 6–18 kW and 400–800 V DC. Confirm minimum, nominal and maximum vehicle voltage, heating duty, coolant conditions and control interfaces before selecting a configuration.
Why 800V matters — and why a 400V heater won't do
For the same electrical power, higher voltage can reduce current. Cable sizing, insulation and protection must still be determined for the complete operating conditions and approved vehicle design.
High-voltage integration also requires suitable insulation, electrical protection and electromagnetic compatibility. A heater rated for one voltage range must not be assumed suitable for a higher-voltage platform; confirm the released model and applicable evidence.
The supplied A-series specification lists a 400–800 V DC operating range. A nominal 800 V platform may exceed that range at some operating points: check the complete vehicle voltage window and confirm the selected heater configuration with EVLINK before approval.
Three jobs, one heater
Cabin heating. A bus cabin is a big box with a lot of glass. At -20℃ ambient, passengers notice heating in the first minutes or they complain for the whole route. 6–18 kW into the coolant loop, blown through the existing HVAC core — no separate fuel heater, no exhaust.
Battery preheating. A cold battery charges slowly and gives back less. Routing warm coolant through the battery loop before departure brings the pack into its working window while the bus is still plugged in, so the first kilometers don't eat range.
Windshield defrosting. Regulations don't negotiate. Hot coolant to the defrost core clears the windshield on a frost morning without idling the drivetrain.
One heater, three circuits. Fewer parts to mount, fewer harnesses to route, one component to validate.
Specifications — A series
| Item | Value |
|---|---|
| Heating power | 6–18 kW |
| Operating voltage | 400–800 V DC |
| Communication | CAN bus + enable signal |
| Protection rating | IP67 |
| Operating temperature | -40℃ to +85℃ |
| High-voltage safety | Overvoltage, undervoltage, overcurrent, short-circuit and overheat protection |
| Control | PID regulation, fault self-diagnosis, automatic power limiting |
| Insulation resistance | ≥100 MΩ (DC 1000 V, high-voltage section) |
| EMC | Complies with ISO 11452 Class 3 |
| Dimensions | 350 × 184 × 120 mm |
| Weight | 5.1 kg |
| Certifications | CE, E-Mark, UL |
| Warranty | 2 years |
Sizing it right: four checks before you specify
1. Confirm your voltage window — min, nominal, max. A nominal platform label alone does not establish the heater input range. Provide the complete operating window and confirm the selected model with EVLINK.
2. Match power to the heat load, not the brochure. Cabin volume, glass area, worst-case ambient temperature, and whether the battery loop shares the circuit — these four numbers decide between 6 kW and 18 kW. Oversizing wastes energy on every trip; undersizing means cold complaints. Tell us the vehicle and the climate, we'll do the math with you.
3. Plan the CAN integration early. The heater talks CAN and takes an enable signal. If your vehicle controller already manages thermal strategy, we map the messages during sampling — not after you've built the harness.
4. Check the installation envelope. 350 × 184 × 120 mm, 5.1 kg, IP67. It mounts in the thermal bay or chassis rail wherever the coolant loop passes. Coolant ports and high-voltage connector orientation are in the datasheet — check them against your layout before you freeze the design.
Frequently Asked Questions
The A series is listed at 400–800 V DC. Confirm the full minimum and maximum vehicle voltage, and request output data for the selected heater and coolant conditions. A nominal 800 V platform may exceed the heater’s maximum input during operation.
CAN bus control plus a hardwired enable signal. Message definitions are provided at sampling so your vehicle controller can integrate thermal strategy directly.
Sample orders start at 1 set. Standard lead time is 15–20 days. Volume pricing and project schedules are quoted per project.
CE, E-Mark, and UL.
Yes — power range, voltage window, and connector options are engineered per project. Send your platform specs and we come back with a configuration.
Tell us about your bus
OEM and ODM projects welcome. Send your vehicle platform, operating voltage range, heating power target, and installation constraints — our engineers will confirm the match and quote.