Description
Product Overview
The PowerMax PM4 55A converter is engineered to transform 120V AC household power into a stable 12V DC output, ideal for recreational vehicles, marine vessels, and off‑grid installations. Housed in a rugged aluminum enclosure measuring 12 x 9 x 5 inches and weighing 6.44 pounds, the unit combines durability with portability. It delivers up to 55 amps of continuous current, with selectable output voltages ranging from 13.0 to 16.5 volts, making it compatible with lithium, AGM, gel, and traditional lead‑acid batteries. The integrated 4‑stage smart charger—bulk, absorption, float, and equalization—optimizes charging efficiency while extending battery lifespan. Safety features include reverse polarity protection, overload protection, and thermal shutdown, ensuring reliable operation in harsh environments.
Usage
Designed for a wide range of applications, the PM4 55A excels in powering RV appliances, boat electronics, and solar‑plus‑battery systems. Whether you are cruising the coastline, camping in remote locations, or running a tiny off‑grid home, this converter supplies clean, regulated power to LED lighting, refrigeration, air‑conditioning, and entertainment systems. Its quick‑connect terminals and plug‑and‑play design allow installation in under ten minutes without rewiring, making it suitable for DIY enthusiasts and professional installers alike. 
Why Choose Us
PowerMax brings over two decades of expertise in marine and automotive power solutions. The PM4 series is backed by rigorous testing, ISO‑9001 quality management, and a comprehensive warranty that covers manufacturing defects. Unlike generic converters, this model offers an adjustable voltage range and a true 4‑stage charging algorithm, providing superior battery maintenance and reduced wear. The unit’s compact footprint and corrosion‑resistant coating ensure long‑term performance even in salty sea air or dusty desert conditions.
Key Features
- 55 A continuous output with selectable 13‑16.5 V range for versatile battery compatibility.
- 4‑stage smart charger (bulk, absorption, float, equalization) maximizes battery life.
- Built‑in safety: reverse polarity, overload, and thermal shutdown protection.
- Compact aluminum housing, 12 × 9 × 5 in, 6.44 lb for easy mounting in tight spaces.
- Simple 10‑minute installation with pre‑wired terminals and no rewiring required.
FAQ
What types of batteries can I use with the PM4 55A?
The converter is compatible with lithium‑ion, AGM, gel, and traditional lead‑acid batteries, thanks to its adjustable voltage output and multi‑stage charging algorithm.
Can I install the unit myself?
Yes. The PM4 55A comes with pre‑wired terminals and a clear wiring diagram, allowing most users to complete installation in about ten minutes without professional assistance.
How does the 4‑stage charger protect my battery?
The charger progresses through bulk, absorption, float, and equalization stages, each optimized to charge efficiently while preventing over‑charging, sulfation, and cell imbalance.
Is the converter suitable for marine use?
Absolutely. Its corrosion‑resistant aluminum case and sealed connectors meet marine standards, making it ideal for boats and offshore applications.
What warranty does PowerMax provide?
PowerMax offers a two‑year limited warranty covering defects in materials and workmanship, along with lifetime technical support for installation and troubleshooting.




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