Sea Clear Power 150A Smart Battery Paralleling Relay (BPR)

Intelligent Dual Battery Charging for Lithium & AGM Systems

The Sea Clear Power 150A Battery Paralleling Relay (BPR) is the ultimate solution for automatically charging your starting and auxiliary batteries while keeping them safely isolated when your engine is off. Designed specifically for modern marine electrical systems, this intelligent relay works with LiFePO₄ lithium batteries, AGM, lead-acid batteries, Smart Alternators, and Euro 6 charging systems.

Unlike traditional Automatic Charging Relays (ACRs) or Digital Voltage Sensitive Relays (DVSR) and Voltage Sensitive Relays (VSR) devices, the Sea Clear Power BPR features a built-in digital display, programmable voltage settings, charging current monitoring, and reverse current protection, giving you complete control over your boat's charging system.

Key Features

• 150 Amp Continuous Rating
• 250 Amp Intermittent Rating
• Compatible with Lithium (LiFePO₄), AGM & Lead Acid Batteries
•  Works with Smart & Euro 6 Alternators
•  Built-in LED Voltage & Charging Current Display
•  Programmable Engage & Disengage Voltages
•  Adjustable Delay Timers
•  Reverse Current Protection
•  Emergency Start (Override) Function
•  Storage Mode for Long-Term Boat Storage
•  Automatic Battery Isolation
•  IP65 Water & Dust Resistant Housing
•  Compact, Marine-Grade Construction

How It Works

When your engine starts and the starting battery reaches the programmed charging voltage (default 13.3V), the BPR automatically connects your auxiliary battery so both batteries charge simultaneously.

Once the engine is turned off and voltage drops below the programmed disconnect threshold (default 12.8V), the relay automatically isolates the batteries. This prevents accessories from draining your starting battery while ensuring you always have enough power to start your engine.

Emergency Start Assist

Dead starting battery?

Simply press and hold the Assist Start button for 3 seconds and the BPR temporarily connects your auxiliary battery to help start your engine. The override remains active for 60 seconds, giving you time to crank the engine without needing jumper cables.

Fully Programmable

Customize your charging system to fit your exact setup.

Adjustable settings include:

• Engage Voltage
• Disengage Voltage
• Engage Delay
• Disengage Delay
• High Voltage Protection

Perfect for custom lithium battery systems or specialized charging applications.

Built for Marine Reliability

Designed specifically for harsh marine environments, the Sea Clear Power BPR features:

• IP65 sealed enclosure
• Marine-grade hardware
• Reverse current protection
• Surge and spike protection
• Low standby power consumption

Whether you're powering fishing electronics, livewells, stereos, or lighting, the Sea Clear Power BPR keeps your batteries protected and properly charged.

Specifications

• Continuous Current: 150A
• Intermittent Current: 250A
• Operating Voltage: 10–31V DC
• High Voltage Protection: 15.5V
• Operating Current: 300mA
• Standby Current: 5mA Max
• Housing Rating: IP65
• Dimensions: 104 × 80 × 42 mm
• Recommended Cable Size: 6 AWG Minimum
• Recommended Fuse Size: 125–150A

Perfect For

• Bass Boats
• Bay Boats
• Offshore Boats
• Pontoon Boats
• Work Boats
• RV Electrical Systems
• Off-Road Vehicles
• Dual Battery Installations

Why Choose Sea Clear Power?

At Sea Clear Power, we build products specifically for demanding marine applications. Our 150A Smart Battery Paralleling Relay gives you reliable automatic charging, advanced battery protection, and programmable control—all in one compact, waterproof unit designed to keep you on the water longer.