Linear AC-to-DC power supply: 115/230 V AC in, 13.6 V DC out
20 A intermittent, 8 A continuous output (store listing)
1% regulation, 40 mV peak-to-peak ripple; convection-cooled heat sink
The Newmar 115-12-20A is a 115-series DC power supply. It converts AC power from shore or a generator into regulated 12-volt DC, the reverse of what an inverter does. It is designed for 12-volt communication and navigation equipment on commercial vessels and in other demanding installations, and its linear circuit design gives noise-free output and long service life. Output is 13.6 V DC nominal, internally adjustable 12.6–14.5 V DC, held within 1% across rated line and load conditions, with ripple of 40 mV peak-to-peak at nominal input. The store listing rates it at 20 A intermittent (20 minutes maximum on time at a 20% duty cycle) and 8 A continuous (24 hours a day at 100% duty).
The input accepts 115 or 230 V AC nominal, selectable for 105–125 or 210–250 V AC at 50–60 Hz, and output derates to 50% below 110 V or 220 V AC input. Maximum input current is 5.5 A at 115 V AC; 2.5 A at 230 V AC. Protection includes overvoltage protection, current limiting at 105% of the intermittent rating, thermal overload protection, and input and output fusing. Large heat-sink fins dissipate semiconductor heat; standard units operate from 0 to 50 °C, with output derating linearly from 100% at 40 °C to 50% at 50 °C. Thermal shutdown occurs at 85 °C case temperature. The case is powder-coated, corrosion-resistant aluminum with integral shock mounts, a conformal-coated circuit board, a front-panel terminal block and a heavy-duty mounting flange. It measures 5.7 × 4.8 × 16.3 in (H × W × D) and weighs 20 lb (9.1 kg).
Size the supply to your equipment's demand. Continuous loads such as navigation electronics must stay within the continuous rating, while transmit peaks from radios can use the intermittent rating within its duty-cycle limits. Options listed for this series include modifying the unit to act as a battery charger, adjusting the output voltage within its range, and adding an ERC transfer relay to switch to a backup battery. If you need DC equipment to keep running when AC fails, compare the Newmar Power-Pac, which combines a power supply with built-in backup batteries.
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Installation & Compatibility Guides
Match the Power Supply to Your DC Equipment
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Match 12 V Equipment
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Size Continuous and Peak Current
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Set the AC Input
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Plan Cooling and Mounting
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Consider Backup Power
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Frequently Asked Questions
What does the Newmar 115-12-20A do?
It converts 115 or 230 V AC into regulated 13.6 V DC to power 12-volt equipment. It is a power supply, not an inverter.
What is the output voltage?
13.6 V DC nominal, internally adjustable 12.6–14.5 V DC.
What current can it supply?
The store listing rates it at 20 A intermittent (20 minutes on, 20% duty) and 8 A continuous.
Can it run on 230 V AC?
Yes. Input is selectable for 105–125 or 210–250 V AC at 50–60 Hz.
How clean is the output?
Output is held within 1% under rated line and load, with 40 mV peak-to-peak ripple, from a linear design suited to radios and navigation electronics.
Does it have a cooling fan?
No. It uses convection cooling through heat-sink fins; CD models add a thermostatic fan.
Can it charge a battery?
Options listed for this series include a battery-charger modification and an ERC transfer relay for backup batteries. Ask us before ordering if you need either.
Will it keep my equipment running during an AC outage?
No. It needs AC input. For backup, compare the Newmar Power-Pac, which includes batteries.
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