Webasto High Voltage Heaters offer speed, efficiency and battery optimisation

Webasto’s small HV Heaters offer efficiency and safety
(Image courtesy of Webasto)

Webasto offers three electric High Voltage Heaters (HVH) with 10-12 kW of power for electric cars, trucks, buses, construction machinery and special vehicles.

The adjustable HVH 100 Compact, HVH 100 Compact+ and HVH 120 heaters are no larger than an A4 sheet of paper, and they convert direct electric current into heat with practically no losses.

Every electric vehicle (EV) needs a heater to warm the interior. Webasto’s models not only do this, but also optimise the temperature of traction batteries, which has a positive effect on range and service life.

The thin heating layer of the HVHs is firmly bonded to the heat exchanger, which has a large contact area, so they heat up extremely fast and are highly efficient. The service life of the three heaters is 15,000-25,000 hours.

Small but powerful

The HVH 100 Compact and HVH 100 Compact+ heaters measure 284 x 200 x 72 mm, are about 7 cm high and weigh 2.2 kg. The HVH 120 is about 4 cm longer and weighs 2.5 kg. No rare earths are used.

The heaters support low voltages of 12 V or 24 V, and operate from 250 V to 880 V. The power packs deliver 10 kW and 12 kW of heating power and keep the batteries in their comfort zone of 25-30 C.

All three heaters are controlled by a Local Interconnect Network (LIN) bus. The HVH 100 Compact+ and HVH 120 also use the faster Controller Area Network (CAN) protocol, commonly used in commercial vehicles.

Safety first

All three heaters are certified in accordance with CE, ECE-R10, ECE-R122 and ISO 21434. They are protected against cyber attacks. Functional safety is ensured in accordance with ISO 26262 – the 10 kW models with ASIL B, and the 12 kW variant with ASIL D (overheating) for vehicles in which people will sleep. The HVH 120 also satisfies vibration standard ISO16750-3 (2023), profile XVI.

“The focus during development was on making the three new HVHs more compact, lighter and more sustainable, while covering the widest possible range of applications. The HVHs can be flexibly integrated into vehicles and machines,” says Webasto chief technology officer Marcel Bartling.