ProMariner ProSportHD 20 On-Board Marine Battery Charger – 20 Amp, 2 Bank – 44020

Keep your boat's batteries charged, maintained, and ready for your next day on the water with the ProMariner ProSportHD 20 On-Board Marine Battery Charger (MFG #44020). Delivering 20 amps of total charging output across two battery banks, this waterproof marine battery charger provides advanced automatic charging and maintenance for compatible marine starting, trolling motor, and auxiliary batteries.

Part of ProMariner's ProSportHD Generation 4 series, the ProSportHD 20 features advanced ProMar Digital Technology, fully automatic five-stage charging, and Distributed-On-Demand™ Charging Technology, which directs available charging power to the batteries that need it most.

Designed for demanding marine environments, this onboard charger features a heavy-duty tri-surface heat sink, an expanded LED charging display, and rugged marine-grade electrical connections. Its selectable charging profiles support compatible flooded lead-acid, AGM, and GEL batteries, including a high-performance AGM profile specific to the ProSportHD 20 Dual.

Whether you're maintaining batteries between boating trips or preparing your boat for seasonal storage, the ProMariner ProSportHD 20 Dual Bank Charger provides convenient, automatic battery charging and maintenance.

Key Features & Benefits

• 20 Amp Total Charging Output: Delivers up to 20 amps of combined charging current across two battery banks.
• 2-Bank Onboard Marine Battery Charger: Charges and maintains two compatible marine batteries or battery banks.
• Generation 4 ProSportHD Technology: Updated digital charging system with enhanced performance and monitoring.
• Fully Automatic 5-Stage Charging: Analyzes, charges, conditions, maintains, and periodically reconditions batteries.
• Distributed-On-Demand™ Charging: Automatically allocates available charging current based on battery demand.
• Selectable Battery Charging Profiles: Supports compatible flooded lead-acid, AGM, and GEL batteries.
• High-Performance AGM Profile: Includes an AGM HP charging option for compatible high-performance AGM batteries.
• Heavy-Duty Tri-Surface Heat Sink: Upper, lower, and rear-facing cooling surfaces help manage operating temperatures.
• Expanded LED Charging Display: Provides clear charging information and battery status.
• Charge Completion Monitor: Fuel-gauge-style display shows charging progress.
• System Check OK Indicator: Provides installation and system-status feedback.
• Individual Battery Fault Indicators: Helps identify charging or connection problems associated with each bank.
• Waterproof Marine Construction: Designed for demanding onboard environments.
• Marine-Grade Electrical Connections: Industrial-grade jacketed AC and DC cables with molded strain reliefs.
• Built-In Safety Protection: Includes reverse-polarity, over-temperature, over-current, over-voltage, and ignition protection.
• Pre-Wired Installation: Designed for convenient onboard mounting and connection.

Ideal for Marine Battery Charging & Maintenance

The ProMariner ProSportHD 20 (44020) is designed for boat owners who need automatic charging and maintenance across two compatible marine battery banks.

Common applications include:

• Marine starting battery charging
• Trolling motor battery systems
• Auxiliary and house battery maintenance
• Dual-battery marine electrical systems
• Fishing boats and recreational powerboats
• Battery maintenance between boating trips
• Seasonal boat storage and winterization

Its 20-amp output makes it a higher-capacity two-bank option compared with the ProSport HD8 and HD12 models.

Product Specifications

• Brand: ProMariner
• Product Series: ProSport Heavy Duty Generation 4
• Model: ProSportHD 20 Dual
• Manufacturer Part Number (MFG #): 44020
• Product Type: On-Board Marine Battery Charger
• Total Charging Output: 20 Amps
• Number of Charging Banks: 2
• Charging System: Fully Automatic 5-Stage Digital Charging
• Charging Technology: ProMar Digital Microprocessor Control
• Charge Distribution: Distributed-On-Demand™
• Supported Battery Types: Compatible Flooded Lead-Acid, AGM, and GEL
• Special Charging Profile: High-Performance AGM (AGM HP)
• Cooling Design: Heavy-Duty Tri-Surface Extruded Heat Sink
• Display: Expanded LED Charging Status Display
• Charge Completion Indicator: Fuel-Gauge-Style Monitor
• Battery Monitoring: Individual Battery Status and Fault Indicators
• System Indicator: System Check OK
• Electrical Cables: Industrial-Grade Jacketed AC and DC Cables
• Safety Features: Reverse Polarity, Over-Temperature, Over-Current, Over-Voltage, and Ignition Protection
• Fuses: Dual In-Line Waterproof Fuses
• Listed Standards: Marine UL 1236, CEC, DOE, and FCC Class B, per supplied specifications
• Installation: Pre-Wired Onboard Charger
• Quantity Included: 1 Battery Charger

Fully Automatic 5-Stage Digital Charging

The ProSportHD 20 Dual uses a five-stage digital charging system to manage battery charging and maintenance automatically.

Its charging process includes:

1. Analyze: Evaluates connected battery conditions before charging.
2. Charge: Supplies charging current to batteries that require it.
3. Condition: Uses controlled charging stages to help complete the charging process.
4. Auto Maintain: Monitors batteries after charging and provides maintenance charging when needed.
5. Storage Recondition: Performs periodic battery reconditioning during storage according to the manufacturer's programmed cycle.

This automatic charging process helps maintain battery readiness while reducing the need for manual monitoring.

Distributed-On-Demand™ Charging Technology

The ProMariner ProSportHD 20 uses Distributed-On-Demand™ technology to manage charging power efficiently across two battery banks.

Instead of permanently dividing output equally between batteries, the charger automatically allocates available charging current according to battery demand.

When one battery requires less charging current, unused capacity can be directed toward another connected battery that needs additional charging.

Important: The ProSportHD 20 delivers 20 amps total across two banks, not 20 amps per bank.

Selectable Battery Charging Profiles

The ProSportHD 20 Dual features selectable charging profiles designed for compatible marine battery types.

Supported profiles include:

• Flooded Lead-Acid: For compatible traditional flooded marine batteries.
• AGM: For compatible absorbed glass mat batteries.
• GEL: For compatible gel-cell batteries.
• High-Performance AGM: A specialized charging profile available on the ProSportHD 20 Dual for compatible high-performance AGM batteries.

Always select the correct charging profile according to the battery manufacturer's specifications.

Lithium battery compatibility should not be assumed. Only use lithium batteries if explicitly supported by the exact charger's manufacturer documentation.

Heavy-Duty Tri-Surface Heat Sink Design

The ProSportHD Generation 4 features an upgraded cooling design to support consistent charging performance.

Its extruded heat sink incorporates upper, lower, and rear-facing cooling surfaces that help dissipate heat during operation.

This design supports efficient charger operation while delivering rated charging current during the appropriate charging stage.

Expanded LED Display & Charge Completion Monitor

The ProSportHD 20 Dual includes an expanded LED display designed to help boat owners monitor charging activity and identify potential battery problems.

Display features include:

• Fuel-gauge-style charging completion monitor
• Four-color multi-stage charging status bar
• Charge mode indicators
• System Check OK indicator
• Individual battery status and fault indicators
• Selected battery type indication

These indicators provide convenient visual feedback during charging, maintenance, and troubleshooting.

Waterproof Design & Built-In Marine Safety

The ProMariner ProSportHD 20 (44020) is designed for marine use with rugged waterproof construction and heavy-duty electrical connections.

Safety and construction features include:

• Dual in-line waterproof fuses
• Reverse-polarity protection
• Over-temperature protection
• Over-current protection
• Over-voltage protection
• Ignition protection
• Industrial-grade jacketed AC and DC cables
• Molded strain reliefs and wire splitters

The supplied product specifications also identify Marine UL 1236, CEC, DOE, and FCC Class B compliance.

Always follow ProMariner's installation instructions, mounting requirements, and applicable marine electrical standards.

Why Choose the ProMariner ProSportHD 20 Dual?

A dependable onboard battery charger helps maintain battery readiness and reduces the need to remove batteries for routine charging.

The ProSportHD 20 Dual (44020) combines 20-amp charging output, automatic five-stage charging, selectable battery profiles, and two-bank capability in one marine charger.

Compared with the ProSport HD8 and HD12, this model provides greater total charging capacity while maintaining a two-bank configuration.

For boats requiring three charging banks instead, consider the ProMariner ProSportHD 20PLUS (44021).

Frequently Asked Questions

What is the ProMariner ProSportHD 20 used for?

The ProSportHD 20 is an onboard marine battery charger designed to automatically charge and maintain two compatible marine battery banks.

Does the ProSportHD 20 provide 20 amps to each battery?

No. It provides 20 amps total, distributed between two battery banks using Distributed-On-Demand™ technology.

Can the ProSportHD 20 charge two batteries simultaneously?

Yes. It is designed to manage charging across two compatible battery banks.

What battery types does the ProSportHD 20 support?

The charger offers selectable profiles for compatible flooded lead-acid, AGM, and GEL batteries, plus a high-performance AGM profile specific to the ProSportHD 20 Dual.

Can I use this charger with lithium batteries?

Do not assume lithium compatibility. Only connect lithium batteries if the exact model's manufacturer documentation explicitly supports the required lithium battery chemistry.

Is the ProSportHD 20 waterproof?

Yes. The charger features waterproof construction designed for marine applications. Follow the manufacturer's mounting and installation requirements.

Can I leave the charger connected during boat storage?

The charger includes automatic maintenance and periodic storage reconditioning features. Follow ProMariner's instructions and your battery manufacturer's recommendations for extended connection.

What is the difference between the ProSportHD 20 and ProSportHD 20PLUS?

Both provide 20 amps of total charging output. The ProSportHD 20 (44020) has two charging banks, while the ProSportHD 20PLUS (44021) has three charging banks.

What is the manufacturer part number?

The manufacturer part number is 44020.

What's Included

• (1) ProMariner ProSportHD 20 Amp On-Board 2 Bank Marine Battery Charger
• Integrated AC and DC charging cables as supplied by the manufacturer

Shop marine battery chargers and electrical accessories at Bakes Marine. Find ProMariner onboard battery chargers, marine electrical equipment, and boat maintenance supplies to keep your boat ready for your next adventure.