For long stays and full-timing, this converter and charger will keep your 12V system steadier and your battery bank recovering overnight. Choose fixed, 2-stage, or 3-stage charging, and check voltage on the LCD.
Most stock converters decide when to charge harder and when to back off, so you don't always know what your battery is actually getting. This adjustable converter puts you in control with three selectable modes: fixed voltage, 2-stage, and full 3-stage smart charging. Pick the approach that fits the way you're using your rig, whether you want hands-off charging and maintenance or you want the converter to stay right where you set it.
With 120 amps available, this converter is a strong fit when you live on your 12V system every day and want predictable charging without constant tweaking. It also supports flooded, AGM, gel, and lithium batteries by letting you manually adjust voltage. So instead of one generic charging pattern on every setup, you can dial in the output your battery calls for, and your setup behaves the way you expect in an RV, a boat, or anywhere you need dependable 12V power.
When your converter keeps jumping between charging modes, your 12V system can feel unpredictable: lights subtly change, fans ramp up and down, and you're left wondering if something is wrong or if it's just the charger doing its thing. Fixed voltage mode solves that by letting you choose one steady output voltage and hold it there, so your gear gets consistent power instead of riding along with boost, normal, and float changes. You get fewer "why did that just change?" moments, you can match a specific voltage your battery prefers, and your voltage stays steadier when multiple loads are running.
The built-in LCD screen shows real-time output voltage, making it easy to confirm that charging is happening at the level you expect. No matter if you're plugged into shore power, running a generator, or testing on the bench, you can watch the voltage climb, settle, and hold where you set it.
The compact, deck-mounted design works for larger systems and bigger battery banks common in full-time rigs. The temperature-controlled fan helps manage heat without adding unnecessary noise. Built-in current limiting, overload, and short-circuit protection support reliable operation whether you're charging overnight or pushing current during short generator runs.
Alternate Instructions
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody. Andy here with etrailer. Let's take a quick look at this PowerMax AC to DC Converter with Built-In 3-2-1 Stage Battery Charger. Now, this is a two-in-one power solution for you. First, it's going to take regular household power, what you get from an outlet or a generator, and it's going to convert it to 12-volt DC power. But then secondly, it's going to act as a smart battery charger to keep a 12-volt battery properly charged without overworking it.
What makes this model stand out is it's 120-amp output, which is a lot of power. That means it's great for bigger setups like larger RVs, boats, or off-grid systems where you're running multiple 12-volt devices or charging a big battery bank. The charger side of this is very user-friendly. It can charge in three stages, which is the safest and most efficient way to charge a battery, but you can also switch it to two-stage or even a fixed voltage mode if you have a specific charging need. It's also adjustable, so you can fine tune the voltage depending on the battery type you're using, a GM, flooded, gel and so on.
And it also comes with a host of other practical features like a built-in display that you see right here so you can see what it's doing, a temperature controlled cooling fan right here or right here rather, here we go, and a safety precaution or safety protections rather for overloads and short circuits. And this is a compact mountable design that's gonna fit well in many RV compartments or marine spaces. Talking about compact, the overall length from end to end, I'm including the terminals here, about 9 7/8 inches long. The overall height, about 4 3/16 inches tall. The overall width, and I'm including our brackets here, about 8 1/8 inches wide.
Now, if you happen to have any other questions, whether it's about this unit or anything else that we have here at etrailer, don't hesitate to reach out because ultimately we wanna make sure that you're getting exactly what you need. Well, again, my name is Andy. Thank you for joining me.
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