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PowerMax AC to DC Converter w/ Built-In 3-2-1 Stage Battery Charger - 12V - 45 Amps
PowerMax

PowerMax AC to DC Converter w/ Built-In 3-2-1 Stage Battery Charger - 12V - 45 Amps

Part Number: PM34VR
In Stock
$155.00
Retail:$209.00
You Save: $54.00
RV Power Converter
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Ever pulled in after a drive, ran your lights, pump, and slides, and woke up to a battery that wasn't caught up? Choose your charge mode, check the LCD, and help your battery recover overnight so your 12V basics are ready to go. Great Prices for the best rv power converter from PowerMax. PowerMax AC to DC Converter w/ Built-In 3-2-1 Stage Battery Charger - 12V - 45 Amps part number PM34VR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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PowerMax RV Power Converter - PM34VR

  • 45 Amps
  • AGM
  • Gel
  • Lead Acid
  • Lithium
  • 12V
  • PowerMax
  • Converter Only
  • Multi-Stage Charge
  • No Battery Mode Switch

Ever pulled in after a drive, ran your lights, pump, and slides, and woke up to a battery that wasn't caught up? Choose your charge mode, check the LCD, and help your battery recover overnight so your 12V basics are ready to go.


Highlights

  • Control How Your Batteries Charge: Adjustable converter lets you choose fixed, 2-stage, or 3-stage charging so you can match how you camp, travel, and recharge instead of letting a stock converter make the calls.
  • See Exactly What the Converter Is Doing: Built-in LCD screen shows real-time voltage so you can confirm your battery is charging.
  • Works With Common RV Battery Types: Compatible with flooded, AGM, gel, and lithium batteries so you can keep your current battery setup or upgrade without replacing your converter.
  • Hold a Set Charge When Running a Generator: Fixed voltage mode lets you hold a target voltage to push current in during short generator runs so you can shut it down sooner.
  • Runs Quietly While Managing Heat: Temperature-controlled fan responds as needed instead of running constantly.
  • Built-In Protection for Everyday Reliability: Current limiting, overload, and short-circuit protection help safeguard your batteries and electronics.

Features to know about

Charging That Does What You Tell It To

PowerMax charging stage display

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 45 amps available, it's a solid fit when you want your battery to rebound overnight while you're still using the basics. 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.

Fixed Voltage Mode: Steady 12V Power and More Predictable Battery Charging

PowerMax fixed charging stage display

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 12V 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 12V loads are going.

Numbers You Can See and Trust

PowerMax digital display on top of the converter/charger

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.

Made for RV Use, Not Just a Workbench

PowerMax deck-mounted charger and converter held by a human for scale

The compact, deck-mounted design fits easily in cabinets or utility spaces, and 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.

Specs

Electrical:

  • Output current: 45 amps
  • Adjustable voltage range: 13V-16V
  • Input voltage: 120V AC
  • Maximum continuous power output: 650 watts
  • Maximum AC current: 9 amps

Compatibility & Charging:

  • Battery types supported: Flooded, AGM, gel, and lithium
  • Charging modes: Fixed voltage, 2-stage, and 3-stage smart charging

Dimensions & Construction:

  • Outside dimensions: 10-1/2" long x 7-13/16" wide x 3-1/2" tall
  • Weight: 7 lbs

General:

  • Temperature-controlled cooling fan
  • Current limiting, overload, and short-circuit protection
  • Maintenance-free operation
  • Warranty: 2-year limited


PM3-45-SME Power Max AC to DC Converter with Built-In 3/2/1 Stage Charger - 12 Volt - 45A

Compare to WFCO WF-9845 and WF-9845-AD, WF-9845-AD-CB

Installation Details PM34VR Installation instructionsAlternate Instructions PM34VR Installation instructions


California residents: click here


Ratings & Reviews

5.0

1 reviews
Ever pulled in after a drive, ran your lights, pump, and slides, and woke up to a battery that wasn't caught up? Choose your charge mode, check the LCD, and help your battery recover overnight so your 12V basics are ready to go.

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See what our Experts say about this PowerMax RV Power Converter

  • Do RV Converters Like PowerMax 12V AC To DC Converters Work With Series And Parallel Battery Wiring?
    They do, Megan. PowerMax converters like the 45A # PM34VR, 55A # PM94VR, 60A # PM44VR, and 100A # PM84VR can charge batteries wired in series or parallel, as long as the total system voltage is 12 volts. That means you can run multiple batteries to increase capacity, whether you’re building a larger lead-acid bank or upgrading to lithium. So, you can have a single 12v, 2 12v wired in parallel, or even 2 6v wired in series, and the converter will still see 12v and be able to charge the...
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  • What Do The Different Charge Modes / Profiles Do On The PowerMax 12V AC To DC Converters?
    Hey Ron, great question! The new PowerMax stand-alone converters like the 45A # PM34VR, 55A # PM94VR, 60A # PM44VR, and 100A # PM84VR give you three selectable charging modes so you’re not locked into one charging behavior. 3-stage mode factory default: Automatically cycles through boost 14.4V, normal 13.6V, and storage 13.2V to charge and maintain the battery(s). 2-stage mode: Uses boost and float only, which some users prefer for simpler charging behavior. Fixed voltage mode: Lets...
    view full answer...
  • Small RV With 12V Loads And Battery - Is Battery Charger Fine, Or Is Converter Charger Necessary?
    Kevin, that’s a good question. The PowerMax # PM34VR 45 amp isn’t just a battery charger - it also acts as a dedicated 12V power supply when you’re plugged into shore power. That means your lights, fans, and other small 12V accessories can run directly from the converter instead of always pulling through the battery. Compared to using only a battery charger, the # PM34VR reduces how much your battery cycles when you’re plugged in, which can help extend battery life. It also gives you steadier...
    view full answer...
  • Is There A Modern Replacement Camper Converter For Old WFCO WF-9845 12V AC to DC Converter?
    Yes, Linda - the PowerMax # PM34VR 45 amp is a proper replacement for the WFCO WF-9845 standalone converter. Both units (this new one and your old one) are designed to supply 12V power to a DC fuse panel and charge the battery when plugged into shore power / generator power. Staying at the same 45-amp rating is ideal if you haven’t increased your battery capacity or added heavier 12V loads. It keeps wiring requirements the same and avoids unnecessary changes. What type of batteries are...
    view full answer...
  • Can PowerMax Converters Power 12V Lights and Water Pump When Plugged Into Shore Power?
    Great question, Mark. PowerMax converters like the # PM44VR 60 amp - along with the # PM34VR 45 amp, # PM94VR 55 amp, and # PM84VR 100 amp - do both jobs at the same time when you’re plugged into shore power or running a generator. They convert the incoming AC power to 12V DC and send that power directly to your DC distribution panel, so your 12v lights, 12v water pump, 12v fans, and other 12V accessories run normally. At the same time, the converter also sends current to the battery to...
    view full answer...
  • Can PowerMax 45 Amp AC To DC 12V Converter Be Used In Cargo Trailer Conversion Without Power Center?
    Hey Dylan. That’s actually one of the most common uses for the PowerMax AC to DC 12v converter # PM34VR. In small trailers, cargo conversions, and custom builds, it’s normal to have a standalone DC fuse panel and converter instead of a full RV power center. The # PM34VR can feed a DC fuse panel directly to power your 12V loads and charge the battery when you’re plugged into shore power. What you don’t want to do is run the converter to the loads by itself without any downstream fusing....
    view full answer...
  • Converting Enclosed Trailer Into Mobile Workshop With 12V Battery, Converter, Lights, USB Ports
    Paul, you don’t have to run a battery for that setup. A standalone PowerMax converter like the 45 amp unit # PM34VR can power your 12V lights and USB outlets directly when plugged into shore power by converting AC to DC. That said, adding a battery like # 34276285 can help stabilize the system and gives you short-term 12V power if the cord gets unplugged or you don't have shore/generator power for a shore while. Either way, you’ll want a DC fuse panel / fuse box (something simple like...
    view full answer...
  • Can I Replace Old WFCO Or Progressive Dynamics Standalone Converter With New PowerMax Unit? AC to DC
    Yes, Alan - PowerMax converters are a direct replacement for several common standalone converter models. For example: - # PM34VR 45 amp replaces WFCO WF-9845 - # PM94VR 55 amp replaces WFCO WF-9855 - # PM84VR 100 amp replaces WFCO WF-68100, Progressive Dynamics PD-9180, PD-9280, and Iota DLS-90IQ4 These are all converter-only units that feed a DC fuse panel, not integrated power centers. As long as your existing converter is a standalone unit and not built into a power center, the PowerMax...
    view full answer...
  • Can PowerMax Converters Be Used Without 12V Battery In The Camper?
    Hey Chris! Yes, PowerMax converters like the # PM34VR 45 amp, # PM94VR 55 amp, # PM44VR 60 amp, and # PM84VR 100 amp can supply 12V DC power to your system even if a battery isn’t connected. When plugged into shore power, they’ll convert AC power to 12V DC and run your lights, fans, water pump, and other 12V loads directly via the DC fuse box. That said, without a battery in the system, you won’t have any 12V power once shore power is disconnected. For most RV setups, having a battery...
    view full answer...
  • Cargo Trailer Conversion For Hunters - Converter To Go From Shore Power 120V AC To 12V DC
    Hey Tyler, that sounds cool! And yes sir, that’s a great use case for a standalone PowerMax converter. A unit like the PowerMax # PM34VR 45 amp can plug into shore power and convert that AC power into clean 12V DC to run your LED lights, vent fan, and other basic accessories. You’d wire the converter to a small DC fuse panel so each circuit is protected, and you can add a battery if you want 12V power when you’re not plugged in. If you don’t add a battery, the converter will still run...
    view full answer...

Do you have a question about this RV Power Converter?


Info for this part was:

Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Sabrina W
Updated by:
Sabrina W
Employee Alex H
Written by:
Alex H
Employee Andy C
Installed by:
Andy C
Employee Anthony G
Edited by:
Anthony G

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