Why Choose the Newmar 115-12-35CD for Your Marine Power Needs?
In the demanding world of commercial boating, where every piece of navigation and communication gear counts on uninterrupted power, the Newmar 115-12-35CD stands out as a rugged workhorse. This heavy-duty power supply converts 115/230 VAC input to a rock-solid 12VDC output at 35 amps continuous, ensuring your critical systems stay online even in rough seas or extreme conditions.
What sets it apart? Imagine powering sensitive VHF radios, radars, or chartplotters without the voltage dips that plague lesser units. Its tight 1% regulation keeps output steady across varying loads and input fluctuations, while ultra-low 40mV ripple prevents noise from interfering with delicate electronics—perfect for keeping signals crystal clear during long hauls.
Built for the harshest marine environments, this unit features a polyurethane conformal-coated PCB to fend off corrosion from salt spray and humidity, plus a beefy aluminum chassis with integral shock mounts that laugh off vibrations from pounding waves or engine rumble. Large heat sink fins pull heat away efficiently, and the built-in thermally activated cooling fan kicks in just when needed, extending component life for years of reliable service.
Real-World Applications on Commercial Vessels
Captains and marine engineers swear by the 115-12-35CD for outfits like fishing trawlers, offshore supply boats, and research vessels. It seamlessly powers:
- 12VDC communication systems, including SSB radios and satellite comms.
- Navigation arrays: GPS, AIS, and ECDIS without glitches.
- LED lighting and instrumentation banks that demand clean, stable DC.
- Backup systems bridging shore power to onboard batteries during docking.
Pro tip: Pair it with a battery charger setup for hybrid redundancy—switch seamlessly from AC genset to shore power without brownouts disrupting operations.
Engineering Excellence Under the Hood
Crafted with reliability first, this power supply packs comprehensive protections: overvoltage shutdown, current limiting at 105% of rating for short bursts, thermal overload safeguards, and dual input/output fusing. No more fried circuits from surges or overloads.
Quick Specs Overview
| Parameter |
Details |
| Output Voltage |
13.6VDC nominal (adjustable 12.6-14.5VDC) |
| Continuous Current |
35A @ 12VDC |
| Ripple |
<40mV peak-to-peak |
| Regulation |
±1% line/load |
| Input Voltage |
105-125/210-250VAC selectable, 50-60Hz |
| Dimensions |
6.5"H x 9.5"W x 14.0"D |
| Weight |
32 lbs |
| Operating Temp |
0-50°C (derate to 50% @50°C) |
Need more grunt? It handles intermittent peaks up to 35A too, with a 100% duty cycle for continuous ops or 20% duty for bursts (20 min max on-time). Derating below full input voltage? It scales smartly to 50% output, keeping you safe.
Installation and Maintenance Tips from the Field
Drop it into your electrical panel with ease—the front-panel slide switch makes 115/230VAC selection a breeze. Secure with shock mounts to combat hull flex. For longevity:
- Ensure ample airflow around heat sinks; avoid enclosing without vents.
- Periodically check fan operation and clean dust/salt buildup.
- Use marine-grade wiring sized for 35A+ to minimize voltage drop.
- Monitor case temp—thermal shutdown at 85°C protects internals.
Users report decades of service with basic upkeep, making it a smart investment over disposable consumer-grade supplies.
Frequently Asked Questions
Is the Newmar 115-12-35CD suitable for saltwater marine environments?
Absolutely. Its conformal-coated circuit board and corrosion-resistant aluminum enclosure make it ideal for harsh saltwater conditions, shielding against humidity, salt spray, and vibration common on commercial vessels.
What protections are built into this power supply?
It includes overvoltage protection, current limiting at 105% rating, thermal overload shutdown, and input/output fusing to safeguard both the unit and connected equipment from faults.
Can I adjust the output voltage, and what's the range?
Yes, internally adjustable from 12.6VDC to 14.5VDC, with a nominal set at 13.6VDC—great for fine-tuning to match battery charging needs or specific loads.
How does the cooling system work on the CD model?
A thermally activated fan engages automatically alongside passive heat sink fins, ensuring cool operation under full 35A continuous load without excessive noise.
What's the difference between continuous and intermittent ratings?
This model delivers 35A continuously (100% duty, 24/7) or intermittently (35A peaks with 20% duty, max 20 minutes on-time), offering flexibility for varying demands.
Does it derate in high temperatures?
Yes, full output up to 40°C, linearly derating to 50% at 50°C, with automatic thermal shutdown at 85°C case temperature to prevent damage.
Why is low ripple important for my electronics?
The <40mV peak-to-peak ripple minimizes electrical noise, preventing interference in radios, sensors, and digital displays—essential for accurate marine navigation and comms.
The heavy-duty series is designed for the power supply of 12 and 24 VDC communication/navigation equipment on commercial ships where reliability is the main consideration. Input voltage 115 or 230 VAC is selected by
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