MillerTech Dark Speed 12V/36V On-The-Run Dual Bank Marine Lithium Battery Charger

The MillerTech Dark Speed 12V/36V On-The-Run Dual Marine Charger provides a convenient way to charge your marine lithium batteries both at the dock and while running your boat. Designed for boats equipped with a 12V cranking battery and a 36V lithium trolling motor battery, this charger uses available power from your outboard's charging system to help replenish your trolling motor battery while underway.

Unlike traditional onboard chargers that rely solely on shore power, the Dark Speed system combines AC charging with alternator-assisted charging, helping extend your time on the water.

Key Features

• On-The-Run Charging: Uses available power from your outboard's alternator to help recharge your 36V lithium trolling motor battery while the engine is running.

• Dual Voltage Charging: Dedicated 12V and 36V charging outputs for compatible marine battery systems.

• 15A Charging Outputs: Provides a 15A charging output for each battery bank.

• Shore Power Charging: Supports conventional AC charging when connected to an external power source.

• Automatic Power Transfer: Uses preset voltage thresholds to control charging power transfer.

• IP65-Rated Construction: Water-resistant enclosure designed for demanding marine environments.

• Integrated Charging Solution: Combines shore power and on-the-run charging capabilities in one onboard unit.

Specifications

How On-The-Run Charging Works

The MillerTech Dark Speed charger takes advantage of available charging power from your outboard's alternator while the engine is running.

When the charging system reaches the required voltage, the charger can transfer available power to help recharge your auxiliary lithium battery bank. This allows your trolling motor battery to recover some of its charge while traveling between fishing locations.

The system uses the following voltage thresholds:

• 14.0V: Start power transfer

• 13.3V: Stop power transfer

Actual charging performance depends on your outboard's alternator capacity, battery condition, and electrical system configuration.

Marine Battery Applications

Designed for compatible marine electrical systems using:

• A 12V cranking battery

• A 36V lithium trolling motor battery

• An outboard charging system capable of supporting additional charging demand

This charger is particularly useful for anglers who make frequent runs between fishing locations and want to take advantage of available alternator power throughout the day.

Installation & Compatibility

Proper installation is important for safe and reliable operation. Verify your outboard's alternator capacity, battery charging requirements, and electrical system compatibility before installation.

Important: This model features dedicated 12V and 36V charging outputs. It is not intended for 24V trolling motor batteries or 16V electronics batteries.

Why Choose MillerTech Dark Speed?

The MillerTech Dark Speed On-The-Run charger provides greater flexibility for anglers running 36V lithium trolling motor systems. By combining shore power charging with the ability to use available alternator power while underway, it helps reduce reliance on dockside charging and keeps your batteries ready for more time fishing.