PowerMax PM4-35A: 35 Amp RV Power Converter Charger | 12V Smart 4-Stage Battery Charger | Adjustable 13–16.5V | Lithium Compatible | Quiet Fan | PD9135 Upgrade

PowerMax PM4-35A: Flexible, reliable RV power conversion

The PowerMax PM4-35A is built for modern RVs, travel trailers, and mobile work setups. It converts 110V AC shore power into a clean, steady 12V DC supply, capable of both charging batteries and running 12V devices on the go. With a compact, rugged design and an emphasis on efficiency, it aims to keep your 12V systems ready without drawing unnecessary attention to noise or heat. Whether you are parked at a campground, boondocking off-grid, or maintaining a mobile workshop, this converter is designed to be a dependable part of your power solution.

Smart charging that adapts to your battery chemistry

The built-in 4-stage charging cycle—Bulk, Absorption, Float, and Equalization—works across multiple battery types including AGM, Gel, Lead-Acid, and Lithium. Automatic voltage regulation helps optimize performance and reduce maintenance needs, making it a practical choice for long trips, weekend getaways, or remote repairs where battery health matters.

• 35 Amp continuous 12V output powers 12V systems and battery charging with consistent performance
• Adjustable output from 13V to 16.5V to suit different chemistries and RV setups
• Automatic, safe charging minimizes risk of overcharge and supports battery longevity

• 110V AC to 12V DC conversion provides stable shore-to-vehicle power for electronics and accessories
• Ultra-quiet cooling fan with thermal speed control protects components without disturbing quiet environments
• Rugged metal housing offers durability in RV bays, garages, and outdoor locations

One of the standout benefits is the ability to support LiFePO4 lithium systems with a carefully tuned charging profile, alongside traditional chemistries. The PM4-35A is designed to deliver clean, stable power that helps keep ECMs, diagnostic tools, and other sensitive electronics performing reliably. The unit’s broader compatibility makes it a versatile upgrade for those replacing older converters, including common PD9135 models, while preserving compatibility with existing 12V layouts and wiring.

In real-world use, travelers may notice smoother operation of 12V devices, fewer voltage drops during peak loads, and a quieter cabin environment thanks to the fan’s selective activation. The combination of adjustable voltage, multi-chemistry support, and a sturdy build is intended to offer flexibility and peace of mind for off-grid camps, seasonal rigs, and mobile service crews who rely on steady 12V power for success on the road.