The Hard Korr 40A DC-DC Charger steps in when a standard alternator will not fully charge an auxiliary battery, pushing up to 40A into AGM, Gel, SLA, Calcium and LiFePO4 banks while you drive. The unit works with 12V and 24V systems and takes a solar feed between 10V and 32V, so you can park up and still keep fridges, lights and compressors powered off a separate house battery instead of the cranking battery.

The charger runs through a three-stage program and draws up to 47A at the input, matching modern dual-battery setups that cop long corrugations and plenty of heat. An alloy housing with IP66 waterproofing keeps dust and spray out, while the compact 183mm by 129.3mm by 46.4mm body mounts neatly under the bonnet or in a canopy. With an operating window from -20°C to 80°C, this gear is a smart buy for Aussie touring rigs.

• 40A DC-DC charger with inbuilt MPPT solar regulator
• Supports 12V and 24V battery systems in touring vehicles
• Compatible with SLA, AGM, Gel, Calcium and LiFePO4 batteries
• DC input voltage range from 9V to 32V for standard or smart alternators
• Solar input range from 10V to 32V with minimum MPPT power of 30W
• Maximum input current of 47A for strong charge capability
• IP66 waterproof aluminium housing for dust and spray protection
• Compact dimensions: 183mm L x 129.3mm W x 46.4mm H
• Operating temperature range from -20°C to 80°C suits engine-bay installs
• Supplied pre-wired with Anderson-style plugs for alternator, solar and auxiliary battery connections

Q: Can this charger be used with lithium (LiFePO4) batteries?

Yes, it is compatible with LiFePO4 batteries. The mode selector on the front panel includes a dedicated LiFePO4 setting alongside AGM, Gel, SLA and Calcium. Using the correct mode helps the charger hit the right absorption and float voltages. That supports better performance and lifespan for your lithium house battery in touring setups.

Q: Does the Hard Korr 40A DC-DC Charger accept solar input directly?

Yes, it includes an inbuilt MPPT solar regulator. The solar input range is 10–32V, which suits common 12V and 24V solar panels. Minimum MPPT solar output power is 30W, so even a smaller panel can contribute charge. This means you can wire panels straight into the solar Anderson plug without a separate regulator.

Q: Is the charger suitable for mounting under the bonnet?

Yes, it is engine-bay ready within its rated limits. The aluminium housing is sealed to IP66, protecting against dust and high-pressure spray. An operating temperature range from -20°C to 80°C covers typical under-bonnet heat in Australian conditions. Always mount it away from exhaust components and allow airflow around the fins.

Q: What vehicle systems will this charger work with?

It works with 12V and 24V vehicles using standard or smart alternators. The DC input voltage range of 9–32V lets it operate across a wide variety of 4WDs, wagons, vans and light trucks. You can run it as part of a dual-battery setup feeding an auxiliary battery in the tub, canopy or camper. Just ensure cable sizes and fusing match the 40A output rating.

Charger suits dual-battery setups using 12V or 24V electrical systems in vehicles with standard or smart alternators. Unit is engine-bay ready for under-bonnet mounting where space and airflow allow. Solar input accepts 10–32V panels to charge the auxiliary battery while parked. Compatible with SLA, AGM, Gel, Calcium and LiFePO4 auxiliary batteries in touring, camping and 4WD setups.