SKU: 44152506121

Mastervolt Mac Plus 12/48-15 [81203205]

Sale price$276.30 Regular price$307.00
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Description

Mastervolt Mac Plus 12/48-15 [81203205]Mac Plus 12 48 15 Boost Your Service Battery Too often, service batteries dont get the charge they need. This is a problem made worse by smart alternators and start stop systems, which result in slow and insufficient charges. The Mac Plus 48V and 36V solve that problem. With brand new bi directional technology, the Mac Plus can use each side as an input or output, delivering a reliable and consistent charge to both service and starter batteries.

Mac Plus 12/48-15

Boost Your Service Battery

Too often, service batteries don’t get the charge they need. This is a problem made worse by smart alternators and start/stop systems, which result in slow and insufficient charges. The Mac Plus 48V and 36V solve that problem. With brand-new bi-directional technology, the Mac Plus can use each side as an input or output, delivering a reliable and consistent charge to both service and starter batteries.

Proven Mastervolt Quality

The Mac Plus uses the proven Mastervolt 3-step+ charge algorithm, delivering a quick and easy charge, even to completely flat batteries. By knowing when the engine is running and providing charge, you can also be sure that the Mac Plus will never drain your starter battery.

A robust design holds up in even the harshest conditions, with battery temperature-optimized charging and high-quality aluminum housing to ensure superior protection against dust and water ingress. The power-efficient design also allows the Mac Plus to operate silently and without a fan.

Total Power Flexibility

With a wide DC input range, the Mac Plus allows all DC sources and can charge two batteries from a single alternator or charger. It supports a full range of chemistries and battery types, including lithium. It also functions seamlessly with modern alternators such as Euro 5 and 6, ensuring proper charging by providing constant power, even when the alternator is inactive.

Parallel configuration of up to ten units will provide over 100 amperes. And advanced high-frequency technology with modern microprocessors ensures minimal power loss when switching from 36/48V to 12/24V and vice versa.

Analog voltage sense ports are also available to compensate for voltage drops and maintain proper charging.

Superior Monitoring & Control

Compatibility with CZone®, NMEA 2000®, and MasterBus delivers truly superior monitoring and control and ensures Mac Plus integrates easily into complete systems. Achieve the best performance possible via various controllers and high-quality MOSFETs. And configure the Mac Plus with ease via MasterAdjust, the CZone configuration tool, or even via the on-board DIP switches.

Features:

  • Bi-directional technology
  • Get either 48V or 36V power from a single unit
  • Fast and safe charging, even during short trips
  • Fanless design for silent operation
  • Suitable for flooded, Gel, AGM, and Li-Ion batteries (incl. LiFePO4)
  • Even charges fully depleted batteries
  • Engine run detection protects the starter battery
  • Adjustable current limits to meet Euro 5/6 requirements
  • Voltage stabilization protects sensitive equipment, lights, and loads
  • Parallel operation to obtain charging capacities well over 100 Amps
  • MasterBus, CZone, and NMEA 2000 compatible, with intelligent system monitoring and automation
  • Temperature compensation and voltage sense for an optimal charging result
  • E-Mark/R10 certification for mobile applications
  • Power supply mode offers stable power for sensitive loads
  • Heavy-duty connections for easy installation and quick setup via DIP switches

General Specifications:

  • Battery Voltage Sense: Yes
  • Status indicator: Yes, 3 color double LED
  • Communication protocol: MasterBus, CZone & NMEA 2000
  • Output voltage: 30-60 V DC
  • Nominal output voltage: 36/48 V
  • Output voltage stabilization: 2 % at extremes of temps, load, and input
  • Output voltage ripple (peak-peak): Max. 1 %
  • Max. output power: 900 W
  • Max. output current: 15 A
  • Nominal input voltage: 12 V DC
  • Input voltage range: 8-16 V
  • Max. input current: 60 A
  • Galvanic isolation: No
  • Efficiency: > 95 % (at nom. input voltage, full load); 97 % peak
  • Parallel configuration: Yes, up to 4
  • Alarm contact: Yes, through MasterBus, CZone, DIP Switch, or remote switch
  • Engine run signal input: Yes (active high/active low)
  • DIP switches: Yes, for basic setup
  • Dimensions, hxwxd: 255x165x66 mm, 10.0 x 6.5 x 2.6 inch
  • Weight: 2 kg, 4.4 lb
  • Compliance: CE, E-Mark, SAE J1171, ISO 8846 ignition protected, ABYC & UKCA

Technical Specifications:

  • Battery types: Gel, AGM, Lithium Ion, user-defined
  • Power consumption: < 5 mA, < 10 mA in CZone, < 1 mA in MasterBus
  • Temperature range (ambient temp.): - 25 °C to 60 °C; derating > 40 °C/104 °F
  • Cooling: Natural cooling
  • Protection degree: IP23
  • Protections: Overload, over-temperature, DC short circuit, reversed polarity (fuse)

Specifications:

  • Charger Input - Voltage: 12v
  • Charger Output - Amps: 15a
  • Charger Output Voltage: 36/48V
  • Box Dimensions: 4"H x 9"W x 15"L WT: 5.6 lbs
  • UPC: 816882023446

Quick Guide (pdf)
Owner's Manual (pdf)
Brochure (pdf)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 44152506121

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4.6 ★★★★★
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Sonja Foster
Grantham, US
★★★★★ 5
Huge, super soft, cozy pillow!
Size: Jumbo (25-Inch), Color: Sage
This pillow is awesome! As a plus size person who can't sleep laying flat, the size and support level is perfect. This pillow is huge! The quality is very high, the stitching is precise, and the sage green material is soft and cozy. Great value for the price! I highly recommend this reading pillow!
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Reviewed in the United States on May 28, 2026
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GN
Phoenix, US
★★★★★ 5
MUST BUY Item for Breastfeeding Moms
Size: Standard (18-Inch), Color: Dark Grey
MUST GET item for breastfeeding moms. It is a soft pillow with a removable washable cover. The material is like a suede, which can make it hot to lean on if you typically feel hot when breastfeeding or sleeping. It allows you to sit up straight while in bed with great support.
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Reviewed in the United States on May 1, 2026
M
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Ms. Rea
Belleville, US
★★★★★ 5
It's perfect support.
Size: Extra Back Support (21-Inch), Color: Dark Grey
The best way to describe the super comfy reading pillow is super comfy. I use it to sit up while watching something soothing to my mind on tv and due to its comfyness and softness, it's perfectly just right for my back. The funny thing is within a few minutes I'm knocked out sleep, which is a good thing. It's soft but firm lumbar area and arms feels oh so comfortable. It gives the best sleep quality and less toss and turning. I highly recommend.
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Reviewed in the United States on May 7, 2026
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Verified Purchase
Michael Simko
Los Angeles, US
★★★★★ 4
Great Size and Comfort
Size: Extra Back Support (21-Inch), Color: Dark Grey
2 months after buying a different reading pillow I felt it was time to buy a different one based on the comfort and support. I found this one listed for a good price. After carefully looking through the listing, I bought the 21" size. On my first night of usage, I was already impressed with the comfort and support vs the reading pillow I had bought 2 months prior. I like how this one has nice support for my neck and head as I'm relaxing on my bed with my laptop and phone. The texture of the filling gives it a very nice combination of cushioning and firmness. The horizontal feature line in the center of the pillow is a nice feature for back and neck support thanks to it giving the pillow some flexibility. As for the arms, their length, width, height, and cushioning are very good for resting my arm while I'm using the wireless mouse with my laptop.
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Reviewed in the United States on February 27, 2026
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GhostFingersXP
Birmingham, US
★★★★★ 5
Book Reading Wife Approved
Size: Standard (18-Inch), Color: Sage Green
I purchased this for my wife who reads quite a bit and she absolutely loves it. She said it feels soft, is the right size for her, and makes book reading more comfortable for her. I call it a win.
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Reviewed in the United States on April 23, 2026

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