When you've got multiple 12V loads going at once, it's easy for your battery to fall behind. Choose your charge mode, watch the LCD, and keep steadier 12V power while your battery recovers overnight.
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.
This 75-amp converter is a solid fit when you want your battery to recover overnight without babysitting the charger. 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 mid-size systems and heavier daily draws. 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.
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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 if you're plugged into shore power and you want a reliable way to run your 12-volt systems and keep your batteries properly charged, this PowerMax unit is gonna be a great option for you to consider. Think of it as a combination power supply and smart battery charger all in one box. This is going to take regular household AC power, and it's going to convert it into 12-volt DC power at up to 75 amps, which is gonna be plenty for running lights, pumps, fans, and other 12-volt equipment.
At the same time, this is also going to work as a multi-stage battery charger, meaning that it's gonna charge your batteries at first and then it's gonna slow down to protect them and extend their life. This three-stage charging, which is bulk, absorption, and float, is the same style used in modern RV and marine systems because it's safer and much better for long-term battery health. This unit also includes built-in safety features like protection against overloads, overheating, short circuits, and even accidentally hooking up the battery backwards. The cooling fan is going to keep the temperature controlled, so it's gonna run when needed, but stay quieter than older converter designs. Now people typically use this converter in RVs, boats, off-grid setups, or any situation where they need dependable 12-volt power and proper battery charging when connected to AC power.
It's also useful for maintaining larger battery banks because of its high 75-amp output. Giving you some measurements here. Looking at the overall length from end to end, and I'm including our terminals here, we're sitting about 9 7/8 inches long. The overall width, and I'm including the brackets here, about 8 1/8 inches wide. And the overall height, about 4 3/16 inches tall.
So this is a strong, safe, and smart way to power your 12-volt system directly while taking care of your batteries the right way. If you have any other questions, whether it's about this or anything else that we have here at etrailer, don't hesitate to reach out to us, 'cause ultimately we wanna make sure that you're getting exactly what you need. Well, again, my name's Andy. Thank you for joining me.
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