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

Manufacturer

NewMar

<h3>About NewMar Power</h3><p>Founded in 1970 and headquartered in Costa Mesa, California, <strong>NewMar Power</strong> has spent more than five decades earning a reputation as one of the most trusted names in DC power technology. From the marine deck to the telecom rack, NewMar designs and manufactures power solutions built to perform when reliability is not optional. Today, NewMar operates as part of Mission Critical Electronics (MCE), a family of specialized power brands serving critical infrastructure, public safety, transportation, and industrial automation markets worldwide.</p><h3>A Complete DC Power Ecosystem</h3><p>What sets NewMar apart is the breadth and depth of its DC power portfolio. The brand offers an extensive lineup that spans <a href="/11280-newmar-battery-chargers-200141">battery chargers</a>, DC power systems, hot swap rectifiers, power conversion equipment, DC UPS solutions, DIN rail power, and DC power distribution — essentially everything needed to design, deploy, and maintain a robust DC power infrastructure. Whether the application is a commercial fishing vessel, a first-responder communications vehicle, a cellular network installation, or an industrial automation system, NewMar has purpose-engineered solutions to match.</p><p>NewMar&apos;s <a href="/11280-newmar-vehicle-battery-2476">vehicle batteries</a> and battery management products reflect the same engineering philosophy: deliver clean, stable power under demanding real-world conditions. Their smart charging algorithms, temperature compensation, and multi-stage charge profiles help extend battery life and protect sensitive electronics — critical considerations in marine and mobile environments where a power failure can mean more than just an inconvenience.</p><h3>Engineering Quality and Industry Certifications</h3><p>As an ISO 9001-certified facility, NewMar maintains a rigorous Quality Management System ensuring that every product consistently meets both customer expectations and applicable regulatory requirements. This commitment to process discipline translates directly into field reliability — a reason why NewMar products are found aboard emergency vehicles, in telecom huts, on offshore vessels, and throughout wireless network infrastructure across North America and beyond.</p><p>With over 50 years of engineering experience and a track record of delivering customized power system designs, NewMar continues to be the go-to partner for integrators and engineers who need dependable DC power — right out of the box and for years into the future.</p><h3>Industries Served</h3><ul style="list-style:disc"><li><strong>Marine</strong> — Shore power chargers, inverter/chargers, and DC distribution for recreational and commercial vessels</li><li><strong>Telecommunications &amp; Wireless Networks</strong> — Rectifiers, DC UPS, and power systems for tower sites and network huts</li><li><strong>Public Safety &amp; Land Mobile</strong> — Mobile DC power stabilizers and battery backup for emergency response vehicles</li><li><strong>Industrial &amp; Automation (IIoT)</strong> — DIN rail power supplies and rugged power conversion for factory and field automation</li></ul>

Part Number

1-2-120
09/12/2036 8:47 AM
Sale Price

$214.88

4 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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