NewMar Battery Isolators & Voltage Sensitive Relays

NewMar Battery Isolators & Voltage Sensitive Relays: Professional-Grade Marine Power Management

When it comes to protecting a vessel's electrical system, few challenges are more critical than managing multiple battery banks reliably. NewMar — a leading manufacturer of power electronic products for over 50 years — has built a well-earned reputation in the marine industry specifically for tackling this challenge head-on with its line of battery isolators and voltage sensitive relays.

What NewMar Battery Isolators Do

NewMar battery isolators enable automatic charging of multiple batteries from one or two alternators while preventing battery discharge between banks. This is essential for any vessel running separate house and engine start battery banks — a dead house bank should never drag down the cranking battery. These heavy-duty isolators allow charging multiple batteries automatically from one alternator, and prevent discharge or "dumping" of one battery into another.

The Battery Integrator: A Step Beyond the Diode

NewMar also offers the Battery Integrator, a more advanced approach to multi-bank management. The Battery Integrator enables charging of two separate banks from a single source, yet maintains 100% isolation at all other times. A voltage comparator circuit and low resistance contactor act as a "smart" switch, connecting independent battery banks only when a charging voltage is present. It then disconnects them for selective discharge — and because diodes are not used, there is no voltage drop. This makes the Battery Integrator particularly attractive for systems where preserving every fraction of a volt in the charging circuit matters.

Key Features of NewMar Isolators

• Supports 12V to 48V negative ground DC systems with durable construction and efficient heat dissipation.
• Features conservatively rated diodes and a rustproof anodized aluminum heat sink case.
• Includes stainless steel mounting hardware and protective terminal covers for durability, with a continuous duty rating.
• Voltage drop is just 0.7V at 50% load and 0.9V at full load — mount vertically for optimum cooling.
• Available in max input current ratings of 70A, 120A, or 165A depending on the model.

Built for the Marine Environment

NewMar's solutions are engineered with rugged, marine-grade construction, ensuring reliable performance in harsh conditions such as saltwater, vibration, and extreme temperatures. This philosophy carries directly into their isolator line, where the anodized aluminum enclosures and conservatively rated diodes are sized for continuous-duty operation rather than peak-only ratings. NewMar offers an extensive line of DC power products with an earned reputation of high reliability and quality across marine, telecommunications, and other demanding industries.

Whether you are outfitting a recreational cruiser, a commercial workboat, or a live-aboard vessel, NewMar battery isolators and integrators provide a straightforward, proven solution for keeping your battery banks healthy and your onboard systems running.