Under Bonnet 40A DC-DC Battery Charger
With MPPT Solar Regulator

Charge your batteries on the move with our 40A Under Bonnet DC-DC Charger. Use your vehicle's alternator or solar power with the built-in MPPT solar regulator. Ideal for various 12V systems in 4×4, caravan, and camper setups. Withstands up to 80°C, perfect for engine bay or canopy mounting.

Under Bonnet 40A DC-DC Battery Charger With MPPT Solar Regulator
Under Bonnet 40A DC-DC Battery Charger With MPPT Solar Regulator
Under Bonnet 40A DC-DC Battery Charger With MPPT Solar Regulator

Under Bonnet 40A DC-DC Battery Charger With MPPT Solar Regulator

HKPDCDC40UB

Regular price$529.00
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Engine bay ready

- HIGH OPERATING TEMPERATURE – Equipped to work in temperatures ranging from -20°C – 80°C.
- IP66 WATERPROOF – Protected against dust and water making it perfect for the rigours of the engine-bay.
- COMPACT CONSTRUCTION – The small footprint of the charger makes it perfect for mounting in tight spaces.

Charge your battery while you drive or with the sun

Whether you’re touring the country with the family in tow or just trying to keep your drinks icy cold between job sites, our DC-DC charger is one of the easiest ways to keep your batteries topped up without being tethered to a mains power supply. The charger can be used on a range of batteries including both 12V SLA, AGM, gel, calcium, and LiFePO4 systems.

The DC-DC works by converting the power from your alternator into a charge voltage that carefully, but quickly, suits the status, and chemistry of your auxiliary battery all without affecting your vehicle’s starter battery. Designed to work on most vehicles, it’s compatible with either traditional or fixed/smart alternators and will feed up to 40A into your batteries per hour.

There’s a dedicated Anderson-style plug coming from the unit for the inbuilt Maximum Power Point Tracking (MPPT) solar regulator function. The charger will use the power coming from the solar input when it detects it as either the only available power source, or if the solar input exceeds the power being produced by the vehicle. Able to regulate up to 40A, it’s able to handle solar up to 15% more efficiently than traditional Pulse Width Modulation (PWM) regulators.

With a high heat tolerance, the charger can be mounted in most places including under the bonnet. This is particularly useful in vehicles that have the space for an additional battery in the engine bay, like in Landcruisers and Patrols, helping to not only reduce voltage drop but also free up some space in the back of the vehicle.

The charger comes with three pre-wired Anderson-style plugs to make installation simple. The black plug connects directly to the auxiliary battery, the traditional grey plug is the dedicated solar input, whilst the three-pin Anderson plug can be used to quickly connect to the vehicle.



DC Battery Input 9-32V
MPPT Solar Input Voltage 10-32V
Maximum Input Current 47A
Maximum Output Power 40A
Minimum Solar Input 30W
Ingress Protection IP66
Operating Temp. -20°C – 80°C
Compatibility 12 SLA, AGM,Gel, Cal, LiFePO4
Dimensions 183 (L) x 129.3mm (W) x 46.4mm (H)
Certifications IEC/EN 61000-6-1
1x 40A DC-DC Charger With Pre-Wired Three-Pin Anderson Plug

Frequently Asked Questions

  •  Charge your auxiliary batteries up to 100%
  •  Faster charging
  •  Prolongs the life of your batteries
  •  Works with both traditional and smart alternator setups
  •  Compatible with lithium batteries

All Hardkorr products are manufactured using the highest quality materials. We are confident that they are the most durable in the market and will give you many years of reliable service. We stand behind this product with a comprehensive 2-year Australian warranty and a 30-day money back guarantee.

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