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NewMar 1-2-120 Battery Isolator 120 Amp Dual Bank 12V 24V 36V

Manufacturer

NewMar

<h3>NewMar: Trusted DC Power Solutions for Over Five Decades</h3> <p>NewMar has established itself as a premier manufacturer of high-quality DC power products, bringing more than 50 years of engineering excellence to the automotive, marine, and telecommunications industries. Known for their rugged construction and intelligent charging technology, NewMar products deliver reliable performance in demanding environments ranging from emergency service vehicles to off-shore marine applications.</p> <p>The company's reputation is built on a foundation of innovation and quality control. With complete in-house manufacturing capabilities including CNC machining, PCB design and assembly, and comprehensive function testing, NewMar maintains exacting standards throughout the production process. This vertical integration ensures that every product meets the brand's stringent reliability requirements, making NewMar a trusted choice for professionals who depend on consistent power delivery.</p> <h3>Advanced Battery Charging Technology</h3> <p>At the heart of NewMar's product lineup is their proprietary Phase Three smart charging technology, which sets the standard for intelligent <a href="/11280-newmar-vehicle-battery-2476">vehicle battery</a> management. Unlike conventional chargers that can overcharge or undercharge batteries, NewMar's three-stage charging process—bulk, absorption, and float—optimizes charge cycles to maximize battery performance and extend service life. The chargers feature adaptive voltage regulation that automatically adjusts for different battery types including flooded lead-acid, AGM, and gel-cell configurations.</p> <p>NewMar battery chargers are engineered for hostile environments, with rugged stainless steel cases, polyurethane-coated circuitry for corrosion resistance, and sealed construction that prevents dust and moisture intrusion. These chargers can withstand the punishment of off-road vehicles, mining equipment, and marine installations where reliability is non-negotiable. Multiple isolated output banks allow simultaneous charging of separate battery systems, while integrated current limiting prevents damage from overloading.</p> <h3>Remote Starting and Power Accessories</h3> <p>Beyond battery charging, NewMar offers specialized power management solutions including <a href="/11280-newmar-remote-vehicle-starter-kit-14550">remote vehicle starter kits</a> designed for professional and recreational applications. These systems integrate with NewMar's broader power distribution ecosystem, providing seamless compatibility with battery integrators, DC converters, and power supplies.</p> <p>The brand's Battery Integrator products exemplify NewMar's engineering philosophy: intelligent solutions that solve real-world problems. These devices act as smart switches, connecting independent battery banks during charging while isolating them during discharge, allowing users to maintain separate house and engine-start batteries without voltage drop issues common to traditional diode isolators.</p> <h3>Built for Professional Applications</h3> <p>NewMar's commitment to quality has made their products the choice of professionals across multiple industries. From powering critical communications equipment in remote telecom sites to maintaining emergency vehicle battery systems in fire departments, NewMar products deliver when failure is not an option. The company's extensive product line includes DC power systems, inverter-chargers, UPS systems, and a full range of installation accessories, all backed by comprehensive warranties and technical support. Whether you're outfitting a commercial vessel, upgrading an emergency response fleet, or maintaining mission-critical equipment, NewMar provides the reliable DC power solutions that professionals demand.</p>

Part Number

1-2-120
07/13/2036 7:52 AM
Sale Price

$221.07

3 left at this price

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Usually delivered within 2 days

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Product Details

The NewMar 1-2-120 is a heavy-duty 120-amp battery isolator designed to automatically charge multiple batteries from one or two alternators while preventing discharge or 'dumping' of one battery into another. Each battery is charged according to its specific needs without overcharging, making it ideal for marine, RV, and commercial vehicle applications with 12-, 24-, or 36-volt negative ground DC systems.

Key Features:

  • Conservatively rated diodes with rustproof anodized aluminum heat sink case for superior heat dissipation
  • Heavy-duty construction suitable for continuous duty applications
  • Compatible with systems up to 48 volts DC, negative ground
  • Stainless steel mounting hardware and protective terminal covers included
  • Manages one alternator source charging two independent battery banks

Technical Specifications:

  • Maximum Input Capacity: 120 amps
  • Alternator Sources: 1
  • Battery Banks: 2
  • Operating Temperature Range: -40°F to +80°F
  • Voltage Drop: 0.7V at 50% load, 0.9V at full load
  • Temperature Rise: 5°C at full rated current (vertical mounting recommended)
  • Duty Cycle: Continuous rating to 50°C, derate linearly to 70% at 80°C
  • Stud Terminal Size: 6mm
  • Dimensions: 6.5" L × 4.5" W × 3.1" H
  • Weight: 3 lbs

Important Compatibility Note: This battery isolator is not compatible with self-exciting alternators. The alternator must have an external excitation lead. Consult your alternator manufacturer if uncertain about your configuration.

It was great so far

good

The part went thru the packaging and the paint was scraped off but I'll touch it up myself, I was surprised at how fast it arrived, I'll definitely be a return customer.

On drivers side, tube was contacting the body trim (2014 Toyota Access cab) after torqueing the bolts. Gap between body and tube was not uniform. Added small shim at center mount and approximately 1/4 inch shim in the front to achieve clearance and uniform gap. Longer bolt required. Right side installed perfect with no issues.

Great buying process

very easy and good price.

shopping was easy

First time shopper, Great

fast and efficient site. Good prices

Ok so far

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