Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP
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Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP Product Description
Keep your RV, boat, or off-grid setup powered reliably with the Newmar 1-3-70A battery isolator. Designed for demanding environments, this heavy-duty unit manages charging from a single alternator across three separate battery banks, ensuring each gets exactly what it needs without cross-discharge or overcharging headaches. Whether you're boondocking for weeks or running heavy marine electronics, it delivers smart, automatic isolation that protects your investment and keeps you moving.
How the Newmar 1-3-70A Battery Isolator Works
Unlike basic solenoid relays that can fail under heat or constant use, this diode-based isolator uses high-quality, conservatively rated diodes to create one-way charging paths. When your alternator kicks in, power flows to all three batteries proportionally based on their charge levels—starting batteries get priority to stay ready, while house banks build reserves for appliances. Once charging stops, diodes block reverse flow, preventing your deep-cycle batteries from draining the cranking battery overnight. It's plug-and-play simplicity for 12-48V negative ground systems, handling up to 70 amps without breaking a sweat.
Standout Features for Real-World Reliability
- Heavy-Duty Build: Engineered for continuous duty in harsh conditions, from dusty roads to salty seas.
- Wide Voltage Range: Compatible with 12V to 48V DC systems—perfect for custom or high-voltage setups.
- Corrosion-Resistant Design: Anodized aluminum heat sink case sheds rust, paired with stainless steel hardware for marine-grade durability.
- Safety First: Includes protective terminal covers to guard against shorts and accidental contact.
- Efficient Cooling: Mount vertically for optimal heat dissipation, keeping voltage drop minimal even at full load.
Performance Specifications
Built to exceed expectations in extreme conditions:
- Operating Temperature: -40°C to +80°C
- Duty Cycle: Continuous at 50°C, derates linearly to 70% at 80°C
- Temperature Rise: 95°C max at full rated current (vertical mounting recommended)
- Voltage Drop: 0.7V at 50% load, 0.9V at full load
| Model | Alternator Sources | Battery Banks | Max Amperage Input Capacity | Weight (lbs/kg) | Dimensions (L x W x H inches) |
|---|---|---|---|---|---|
| 1/3/70 | 1 | 3 | 70A | 2 / 0.9 | 3.25 x 4.5 x 3.1 |
Ideal Applications
This isolator shines in mobile power systems where reliability is non-negotiable. RVers love it for separating chassis and house batteries during long hauls. Commercial truckers use it to charge auxillary packs without downtime risks. Marine pros rely on its waterproof resilience for dual-battery setups on fishing boats or yachts. Even solar-hybrid rigs benefit from alternator prioritization. If you need three isolated banks from one charging source, this is your go-to for seamless multi-battery management.
Quick Installation Insights
Mount in a cool, dry spot with good airflow—vertical orientation maximizes cooling. Connect the alternator output to the common input terminal, then run dedicated cables to each battery positive. Ground all negatives together. Use appropriately sized wire (at least 6 AWG for 70A runs) and fuses on each output for protection. No relays or solenoids to wire—just diodes doing the smart work. Test by monitoring voltage across banks during charge cycles; expect even distribution without backflow.
Frequently Asked Questions
What makes the Newmar 1-3-70A different from a standard battery relay?
Diode isolators like this one provide passive, always-on isolation without moving parts, eliminating relay chatter, coil failures, or power draw. They're more efficient and reliable for continuous alternator charging.
Can this isolator handle my 24V or 48V system?
Yes, it's rated for 12-48V negative ground DC systems, making it versatile for trucks, RVs, or industrial applications beyond standard 12V automotive use.
Will it prevent my house batteries from draining the starter battery?
Absolutely—diodes create a one-way valve, blocking discharge from aux batteries to the starter pack when the engine is off, even if deeply discharged.
How hot does the Newmar 1-3-70A get under load?
Temp rise is about 95°C at full 70A load with vertical mounting. The anodized aluminum heat sink dissipates heat effectively; ambient up to 80°C is supported with derating.
Is it suitable for marine or off-road use?
Yes, the rust-proof anodized case and stainless hardware make it ideal for wet, salty, or dusty environments like boats and 4x4s.
Does it charge all three batteries equally?
No—it's smart charging: lower voltage batteries draw more current until balanced, preventing overcharge on fuller banks.
What wire size should I use for installation?
For 70A, use 6 AWG or larger copper wire with appropriate fuses (80-100A) on each output leg to match your cable run length and minimize voltage drop.
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| Performance Specifications Operating temper ature: -40 to +80°C
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Buy with the best price Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP for only $176 from NVN Marine! Same day shipping before 3pm.
Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP Technical Specifications
| Type: | |
|---|---|
| Vendor: |
NewMar |
| Weight: |
3.0 lb |
Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP User Reviews
Newmar 1-3-70A Isolator 1AIT 3BATT 70AMP Shipping & Return
| Shipping Weight: |
3.0 lb |
|---|---|
| Box Sizes: |
1.00 (h) x 1.00 (w) x 1.00 (l) |
| Cubic Feet: |
1.0 |
| Returnable: |
Yes |
| USPS First Class: |
Yes |
| P65: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.