SKU: 30733919772

Mastervolt Chargemaster 12a 24v Output 120-230v Input

$286.92 $318.80
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

Mastervolt Chargemaster 12a 24v Output 120-230v InputMastervolt ChargeMaster 24 12 3 Battery Charger Model: 44020120 3 Step+ charging technology for fast and complete charging. Safe and complete charging due to standard safety features. Memory function prevents overcharging in case of an unstable power supply. Clear control panel. Easy to install Built in system functionality (MasterBus) in combination with other Mastervolt products Make the most of your batteries with the ChargeMaster, plugging in and

Mastervolt ChargeMaster 24/12-3 Battery Charger

Model: 44020120
  • 3-Step+ charging technology for fast and complete charging.
  • Safe and complete charging due to standard safety features.
  • Memory function prevents overcharging in case of an unstable power supply.
  • Clear control panel.
  • Easy to install
  • Built-in system functionality (MasterBus) in combination with other Mastervolt products

Make the most of your batteries with the ChargeMaster, plugging in and charging anywhere in the world. Mastervolt’s ChargeMaster guarantees fast and complete charging of your batteries no matter where you are. The ChargeMaster can charge multiple battery banks simultaneously thanks to its combined functionality. Moreover, all ChargeMasters can be easily connected to a MasterBus network with only one cable and one connection (not available on ChargeMaster 12/10 and ChargeMaster 12/15-2). You also have the option of central, local or remote monitoring, configuration and control of your system. The ChargeMaster is available in various models to guarantee you the ideal battery charger for any situation and demand.

The Mastervolt ChargeMaster supplies a maximum capacity wherever you are via auto-ranging. Auto-ranging ensures perfect fully automatic operation anywhere in the world, regardless of the available mains voltage (90-265 V AC, 50 or 60 Hz). The 3-step+ charging technology guarantees fast and complete charging, while the cos phi 1 regulation gets the most out of limited generator capacity.

Metal-on-metal fitting gives a firm connection, and prevents corrosion or overheating of contact surfaces.

The ChargeMaster series has three equal charge outputs. Those of the smaller ChargeMaster models are pre-installed with two metres of cable for a plug & play solution, while the heavier models have one full output (for example for your service battery) and two outputs of 10 A, ideal for your starter batteries.

Specifications
General Specifications
Total charge current 12A
Number of battery outlets 3
Nominal output voltage 24V
Charge current second output 12A
Charge current third output 12A
Battery capacity range 24-120aH
Nominal input voltage 120/230 V (90-265 V), 50/60 Hz
AC connection 2 mtr AC cable
Power supply mode yes
Display/read-out LED display
Technical specifications
Charge characteristic IUoUo, automatic 3-step+ for gel/AGM/wet/Lithium Ion
Charge voltage Bulk 28.8V
Charge voltage Absorption 28.5V
Absorption time 4 hours
Charge voltage Float (wet batteries) 26.5V
Charge voltage Float (gel/AGM batteries) 27.6V
Voltage compensation Automatic
Power consumption (DC side) < 2 mA
Full load consumption (230 V AC) 435W
Current Control function No
Temperature range (ambient temp.) -25 °C to 60 °C, derating > 40 °C
-13 °F to 140 °F
Protection degree IP23
Cooling vario fan
MasterBus compatible Yes
Dimensions 9.2 x 5.2 x 2.4 inch

What's in the Box:
  • ChargeMaster 24/12-3
  • DC-wiring: 2 pcs. positive (red) and 1 pc. negative (black)
  • MasterBus terminating device
  • Documentation
  • Battery temperature sensor
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: 30733919772

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4.2 ★★★★★
Based on 5 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Massapequa, US
★★★★★ 5
Very Comfortable
Color: Navy Blue, Size: Large
Great shirt. Very comfortable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
J
Verified Purchase
Jimmy
San Leandro, US
★★★★★ 5
Takes a Licking and Keeps on Ticking
Color: Green/Black
I love this watch despite the fact that it is really a toy. I love the look of the watch, I love how lite the weight of the watch is on my wrist, and it really does keep good time if you manage the solar charge properly. Other than looking cool on your wrist, this watch has absolutely no functions other than time keeping. The black plastic bezel is molded into the case and does not turn, so don't plan on using that. The watch has no light, the dial numbers are non-luminous and the hands are very limited in terms of luminosity. No buttons. All you can do is adjust the time and date by pulling out what used to be a winding stem in the good old days. The small tag on the strap with Geographic coordinates shown on it indicate the location of the old Timex manufacturing facility (SW of Waterbury, CT). I have a nice ledge at my bedroom window and it gets good western sun for a good part of the day regardless of the time of year. On this ledge you will find a half dozen solar powered watches (mostly Casio) properly aligned to maximize the charge they may receive each day. Note that the description for this Timex watch specifically states that a lightbulb won't charge this watch. You need direct sunlight for several hours if you want to get more than a 3-week charge into this watch. So, I'll leave you with a couple of tips, my friends; 1.) If you are looking for a first watch to give your outdoorsy oriented Son or Daughter, then give them this one. Why? Because it is cool looking, fairly well built, and it actually works, 2.) After you receive your Timex watch, be sure to keep the display mount it is packaged with. It makes a great fixture to mount your watch on for charging and allows you to maximize the position of the solar cells on the dial so that you can optimize charging time. Have Fun! Jimmy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 28, 2026
N
Verified Purchase
Nuka Shroom Soup
Belleville, US
★★★★★ 5
Excellent value, flawless performance for well over a year and no signs of quitting.
Color: Green/Black
Excellent value, had this for well over a year and it still keeps perfect time, still water resistant. No worries about having to change batteries. Owned a fancy expensive (battery) watch once and the dept. store repair intentionally sabotaged the watch in the hopes I would purchase another from them. Yeah, good luck with that, lost my business forever. This is the 21st century, cell phones are the new time pieces, but solar is totally reliable and Timex makes it happen. Holds a charge for many months, although I prop it in a bright window for a few days every few months or so just to make sure the cells are always fully charged, although it's probably unnecessary, just being over cautious. I haven't actually experienced this watch ever running out of power even after months of use. Damn impressive, as it should be.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2025
B
Verified Purchase
Bill
Birmingham, US
★★★★★ 4
Good value for solar watch
Color: Black/Orange
Nice watch! It is plastic like but it is solar. No indiglo button only a little luminous on the hands so you don't want to wear it in tje dark and expect to check the time. 45mm case is good size for my wrist and the band works good also, Not too long not too short. Overall a good watch with no problems
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
B
Verified Purchase
Barry Vercueil
Waukegan, US
★★★★★ 5
Amazing Solar for the price
Color: Black/Orange, Color: Black/Orange
Great watch. Very good visibility. Ligh and feels quality. Easy to swap straps. Same size as my Casio Duro. Highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026

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