Description
Newmar 1-2-120 Battery Isolator | Boat Supply Store
Efficiently manage multiple battery banks from a single or dual alternator system with this heavy-duty diode isolator. It prevents parasitic drain by isolating charging sources, ensuring each battery receives optimal charge without overcharging, extending overall battery lifespan. Rated for 12-, 24-, or 36-volt negative ground DC systems (up to 48V DC), it boasts a 120-amp alternator capacity and an anodized aluminum heat sink for superior thermal management. This robust unit is essential for vessels with complex electrical configurations, such as offshore fishing boats running multiple electronics and trolling motors.
Key Features
- Automated Charging for multiple batteries from one or two alternators.
- Prevents Battery Discharge by stopping one battery from draining into another.
- Optimized Charging ensuring each battery charges independently to its specific need.
- Versatile Voltage Support for 12-, 24-, or 36-volt negative ground DC systems (up to 48 volts DC).
- High Amperage Capacity handles up to 120 amps from the alternator.
- Durable Construction with conservatively rated diodes and rustproof anodized aluminum heat sink.
- Complete Installation Hardware includes stainless steel mounting hardware and protective terminal covers.
- Reliable Performance designed for longevity in harsh marine environments.
Specifications
| Product Specifications | |
|---|---|
| Amperage Rating | 120 Amps |
| System Voltage | 12, 24, or 36 Volt DC (Negative Ground up to 48 Volt DC) |
| Number of Battery Banks Supported | 2 |
| Alternator Source | 1 |
| Heat Sink Material | Anodized Aluminum |
| Diodes | Conservatively Rated |
| Mounting Hardware | Stainless Steel |
| Continuous Operating Temperature | 50°C |
| Derating Temperature | 80°C (derates to 70%) |
| Voltage Drop (50% Load) | 0.7V |
| Voltage Drop (Full Load) | 0.9V |
| Dimensions | 6.5" x 4.5" x 3.1" |
| Weight | 3 lbs |
Who This Is For
Boat owners and marine professionals requiring efficient charging for multiple battery banks from a single or dual alternator system. Ideal for vessels with complex electrical systems needing to maintain optimal battery health and prevent parasitic drain.
How It Compares
| Feature | Newmar 1-2-120 Battery Isolator | Competitor |
|---|---|---|
| Max Amperage Input Capacity | 120A | 120A |
| Battery Banks | 2 | 2 |
| Max System Voltage | 48V DC | 24V DC |
| Type | Diode Isolator | Automatic Charging Relay |
| Voltage Drop (Full Load) | 0.9V | 0.15V |
Common Concerns Answered
Is the voltage drop from this isolator a significant issue?
The Newmar 1-2-120 has a voltage drop of 0.9V at full load. While this is a consideration for some applications where precise voltage regulation is critical, it is within acceptable parameters for many multi-battery charging scenarios and is a trade-off for the diode isolation functionality.
Can this isolator be used with any alternator?
This isolator is not compatible with self-exciting alternators, as it requires an external excitation lead. Users must verify their alternator type to ensure compatibility before installation.
What is the customer sentiment regarding this product?
Customer sentiment is largely positive, with users frequently praising the unit's heavy-duty construction, reliability, and effectiveness in managing multiple battery banks. Minor considerations regarding voltage drop are noted by some users.
Frequently Asked Questions
What is a battery isolator and how does the Newmar 1-2-120 work?
A battery isolator uses diodes to allow current from an alternator to charge multiple battery banks independently, preventing one battery from discharging into another. The Newmar 1-2-120 separates the charging current, ensuring each battery bank receives charge according to its specific needs without overcharging.
Can the Newmar 1-2-120 be used with 24V or 36V systems?
Yes, the Newmar 1-2-120 is designed for 12-, 24-, or 36-volt negative ground DC systems and is rated for up to 48 volts DC, providing broad compatibility.
What is the maximum amperage the Newmar 1-2-120 can handle?
The Newmar 1-2-120 has a maximum alternator capacity of 120 amps, making it suitable for moderately high output alternators.
Is the Newmar 1-2-120 compatible with all types of alternators?
No, this isolator is not compatible with self-exciting alternators. It requires an alternator with an external excitation lead for proper operation.
What is the voltage drop across the Newmar 1-2-120 at different loads?
The voltage drop across the Newmar 1-2-120 is approximately 0.7V at 50% load and 0.9V at full load (120 amps).
