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PowerMax 12v 55 Amp Charger Converter Power Supply

Was: $159.00
Sale Price: $119.95
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Product InformationStore Part Number: PM3-55LK


The PowerMax PM3-55LK charger/converter has a fully integrated 3-stage microprocessor controller along with its highly controlled power supply output. The LK Series features a selector between 3-Stage Smart charging or Fixed Output Mode* for faster charging needs.

The PM3 can accept a low voltage input of 105 volts, and up to 135 VAC on the high end. Weighing in at approximently 7 lbs pounds the PM3-55LK is a great option for RV, radio, backup power, and pump use, as well as many other extremely high amperage demands. Because of its high demand abilities, the PM3 must be installed in a well-ventilated area where it will be safe from the environment.

Using only the best in manufacturing technology, Power Max has designed and built a powerhouse charger/converter. Capable of provinding a constant load demand of up to 100% of its rated capacity, the PM3 series converters are among the best. Pumps, fans, motors, and radio equipment will run with no problems on the PM3 converter/charger. 


*The Fixed Output Mode does not offer smart charging and simply outputs at the fixed voltage. Users are highly recommended to use the 3-Stage charging mode for safe charging.


  • Selectable 3-Step Charging Mode or Fixed Output Mode
  • Adjustable Voltage Dial
  • Variable Speed Cooling Fan
  • Demand Sensing
  • Reverse Polarity Protection
  • Over Voltage Protected
  • Short Circuit Protection
  • Overload Protection
  • Line Regulation
  • Load Regulation
  • Thermal Protection
  • 2 Years Warranty

Tech Specs

  • Dimensions (LxWxH): 7.15 x 10.5 x 3.45 in
  • Weight: 6.4 lb
  • Shipping Weight: 9 lb
  • Output Amperage, Max Continuous: 55 A
  • Max Current, During Bulk Charge: 55 A
  • Output Voltage Full Load: 13.4 V
  • No Load Voltage: 13.6 V
  • Maximum AC Current @ 108 VAC: 8 A
  • AC Input Volts: 115 V
  • AC Input Volts Freq.: 47/63 Hz
  • AC Input Volts Range: 105–135 V
  • Float Current: Variable
  • Model: PM3-55LK
  • Manufacturer: Power Max
  • Bulk Voltage: 14.6v ± 0.2v (default) / Adustable between 13v to 16.5v
  • Float Voltage: 13.56 V
  • Typical Efficiency: 85%
  • Maximum Power Output, Continuous: 780 W
  • Charge Reset: Battery Voltage Threshold: 12.6 V
  • Working Temperature: 0° to 45° C
  • Storage Temperature: -20° to 80° C
  • Over Temperature: 80° C
  • Ripple and Noise: 100 mV rms
  • Output Banks: 1
  • Regulatory Approval: UL Listed
  • Manufacturer Part #: PM3-55LK
  • Made In: China

Reviews and Ratings

4.86 Average
5 Stars 6
4 Stars 1
3 Stars 0
2 Stars 0
1 Stars 0
Rated 4.86/5 Stars from 7 customer reviews.

Do you own the PM3-55LK? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

Very good
Works great
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Written by on Jun 11, 2019. Verified Purchase — (4 of 7 customers found this review helpful
Excellent product
I installed in a rather restricted place, but made ducts for the intake and exhaust. The converter is well-made, quiet, and doing an excellent job.
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Written by on Jul 22, 2019. Verified Purchase — (7 of 9 customers found this review helpful
Great Battery Charger
I bought this charger/converter to charge the LiFePO4 battery on my off grid system. I needed a fairly robust charger for my 325AH battery and I had to be able to adjust the output to the proper voltage. I only have to use it if we have no sun for 3 days and have only used it once since I received it 2 weeks ago. This charger performed well and replaced the 2.2 kW needed to refill the battery in about 3.5 hours, which is right in line with the specs of the charger.

Be advised whenever charging a LiFePO4 battery do not leave it unattended. This charger is not specifically made to charge this type of battery; if you know
the specific settings for your battery and make the adjustments this works great and costs about a quarter of what a charger that is made specifically for these types of batteries.
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Written by on Nov 18, 2019. Verified Purchase — (3 of 4 customers found this review helpful
We are replacing one that had gone south.
Great price exactly what we needed. It arrived so quickly I could not believe it. Customer service was extremely helpful
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Written by on Nov 20, 2019. Verified Purchase — (2 of 3 customers found this review helpful
Shipped and received on time. Easy installation and solved my issues in my camper immediately. First week of operation has been flawless. Thanks !
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Written by on Jan 06, 2020. Verified Purchase — (1 of 1 customers found this review helpful
It was easy to install and work good so far and time will tell what the longevity will be
The 12volt 55amp work good sofar
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Written by on Feb 03, 2020. Verified Purchase
as expected
good price,good product, good service
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Written by on Dec 12, 2019. Verified Purchase

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Manuals & Tutorials


Order Line: 1-800-362-5397
M–F 6am–5pm PST
Tech Help: 541-474-4421
Fax: 541-471-6014
276 Tech Way, Suite A
Grants Pass, OR 97526
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