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ProMariner ProSportHD 20 Plus 12v 24v 36v 20 Amp 3-Bank Marine Battery Charger

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Product InformationStore Part Number: 44021


Replaces: ProMariner 42021, ProMariner 43021

The Professional Mariner 44021 ProSportHD 20 Plus is a 12v 24v 36v 20 Amp 3-Bank Waterproof Marine smart charger. The ProSportHD series is the next evolution to the ProSport line featuring tri-surface heatsink design that is both lightweight and waterproof.

The ProSportHD 20 Plus is compatible with group 24 to group 31 Flooded, AGM, and Gel cell batteries with an Amp/Hr range of approximately 75 to 135 AH. The charger has three 12 volts outputs meant for individual 12v batteries or battery banks that are no larger than 135 AH per bank. The charger can be used to charge three 12v banks, one 36v bank using three 12v batteries, or one 24v battery bank using two 12v batteries with the additional bank available for a 12v starting battery.

The ProSportHD 20 Plus has an enhanced microprocessor that controls charging and features software that provides the charger’s status and battery charge completeness. The charger features 5-Stage charging which Analyzes, Charges, Conditions, Maintains, and once a month will recondition the battery.

The ProSportHD series chargers are built for harsh environments with industrial grade components. The charger is Listed and UL Marine 1236 Certified and meets the new energy efficiency standards set by the DOE and CEC.


  • Compatible with 12v Group 24 to Group 31 Flooded, AGM & Gel Cell Batteries.
  • Distribute on Demand Charging - Charger can distribute the total amperage to any one battery or combination of all batteries as needed.
  • Auto-Maintain Energy Saver Mode
  • Fully Automatic 5-Stage Charging
  • Easy Installation and Operation
  • 3-Year Warranty


Note: Recommended for Group 24-31 Batteries. Not for 4D or 8D Group Size Batteries.

Tech Specs

  • Dimensions (LxWxH): 12.8 x 7.9 x 2.9 in
  • Weight: 7.8 lbs
  • Weight Shipped: 11 lbs
  • AC Input Voltage: 120 VAC
  • AC Input Current: 6.5 A
  • Compatible DC System Voltage: 12v & 24v & 36v
  • Model: ProSportHD 20 Plus
  • Manufacturer: Pro Mariner
  • DC Output Voltage per bank: 12v
  • DC Output Current: 20 A
  • Output Banks: 3
  • Cable Length: 5 Feet each Bank
  • IP Rating: IP67
  • Warranty: 3 Year
  • Manufacturer Part #: 44021
  • UPC: 031669440210
  • Made In: China

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Order Line: 1-800-362-5397
M–F 6am–5pm PST
Tech Help: 541-474-4421
Fax: 541-471-6014
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Grants Pass, OR 97526