Pro Mariner Battery Isolators & Voltage Sensitive Relays
Pro Mariner Battery Isolators & Voltage Sensitive Relays: Smarter Marine Power Management
Managing multiple battery banks aboard a vessel is one of the most critical — and most misunderstood — challenges in marine electrical systems. Pro Mariner has built a reputation over four decades as a leader in marine power management, and nowhere is that expertise more evident than in their lineup of battery isolators and voltage sensitive relays. These are not just passive components; they are intelligent systems engineered to keep your engine start battery healthy while simultaneously maximizing charge across every bank on board.
The ProIsoCharge Series: Beyond Traditional Diode Isolators
At the heart of Pro Mariner's isolator lineup is the ProIsoCharge series — an all-digital approach to battery isolation and charging that sets itself apart from conventional diode-based designs. Pro Mariner's ProIsoCharge delivers digitally controlled alternator output distribution while protecting the health of engine start batteries, providing intelligent and zero voltage loss isolation.
Traditional diode-based isolators suffer from a well-known drawback: a voltage drop of approximately 0.6VDC that starves batteries of a full charge. Pro Mariner's ProIsoCharge eliminates this loss entirely, ensuring batteries reach full charge faster. The all-in-one design also does away with the need for multiple separate voltage sensitive relays, consolidating the charging management of up to four independent battery banks into a single, space-saving unit.
Intelligent Priority Charging
What makes the ProIsoCharge stand out is its Distributed On Demand™ software intelligence. The system's intelligent software control provides priority charging to whichever battery bank is under the heaviest load — such as a house bank or inverter bank — while taking fully charged batteries offline to avoid over-charging. This active management protects the engine start battery at all times, a critical safety consideration for any boater.
- Zero Voltage Loss Isolation: Eliminates the 0.6VDC drop common to traditional diode isolators
- Multi-Bank Support: Models available for 2, 3, or 4 battery banks from one or two alternators
- Dual Alternator Compatibility: Exclusive 2-alternator input models support up to 4 battery banks for twin-engine applications
- Real-Time LED Status Indicators: Highly visible LEDs display alternator presence, charging status, and fault conditions including over-voltage protection
- Gold-Plated Terminals: Multi-battery isolator models feature gold-plated terminals for improved conductivity and corrosion resistance, with an IP68 weather rating
- Ignition-Controlled Activation: Battery bank management activates only when ignition power is on, preventing unnecessary draw
Multi-Battery Isolators for Straightforward Setups
For boaters who need reliable, no-frills isolation, Pro Mariner also offers traditional Multi-Battery Isolators rated from 70 to 130 amps. These units allow simultaneous charging of two or more batteries from a single alternator, with electrical current flowing only from the DC source to the batteries — never back the other way. This prevents any battery bank from discharging into another, safeguarding your engine start reserve even when the house bank is depleted.
Whether you're outfitting a simple single-engine day boat or a complex twin-engine cruiser with multiple battery banks and an inverter system, Pro Mariner's battery isolators and voltage sensitive relay solutions are engineered to deliver reliable, intelligent power distribution on the water.