sdanbom 55A RV Power Converter WF-9855 – 12V DC Charger with Lead-Acid & Lithium Modes, Quiet Fan

The sdanbom WF-9855 is a 55-amp RV power converter that converts 110VAC to regulated 12VDC and offers selectable charging profiles for lead-acid or lithium batteries.

The WF-9855 is designed to replace units in the WF-9800 series and deliver reliable 12V power for trailers, campers and motorhomes. With a dedicated mode switch for lead-acid and lithium chemistries, built-in protections, and a fan that only runs when necessary, this converter balances charging performance with quiet operation. It meets common electrical tolerances so it won’t interfere with nearby consumer electronics like TVs and radios.

How does the WF-9855 charge different battery types?

The WF-9855 includes two distinct charging profiles selectable by a push button. Pressing the button and turning the LED off activates the lithium charging routine; leaving it unpressed with the LED on selects the lead-acid profile. Each profile optimizes voltage and timing appropriate to the battery chemistry to improve charging compatibility.

• Switchable modes: lead-acid or lithium via a single button
• Clear LED indicator shows active mode
• Designed to match typical charging voltages for each chemistry

Will this unit fit my existing WF-9800 series installation?

The WF-9855 is built to be a direct replacement for many WF-9800 series converters, simplifying upgrades or repairs. Before installation, power must be disconnected and wiring checked for correct fit and secure connections. The unit accepts 105–130VAC input at 60Hz and outputs a continuous 55 amps of 12VDC power.

• Direct replacement compatibility with many WF-9800 models
• Input: 105–130 VAC, 60 Hz; Output: 55 A at 12 VDC
• Required: disconnect power, verify wiring, tighten terminals

How quiet and safe is the converter in daily use?

The converter uses a temperature/load-activated cooling fan that remains off until additional cooling is necessary, reducing noise during light loads. Multiple built-in protections guard against over-current, over-temperature, over-voltage and reverse polarity, helping protect your vehicle electrical system and connected devices.

• Smart fan only runs when load or temperature requires it
• Protections: over-current, temperature, voltage, polarity
• Engineered to minimize interference with radios and TVs

Who is this for? The sdanbom WF-9855 is intended for RV and trailer owners who need a robust, replaceable 12V converter that supports both lead-acid and lithium batteries. It suits installers, DIY RVers and fleet maintainers who want a quiet, protected power source that fits common WF-9800 series applications. If you need steady 12V power at up to 55 amps, a selectable chemistry mode, and a compact unit designed to minimize audible operation and electrical interference, this converter is a practical upgrade. Always disconnect power before installation and confirm all wiring is secure; contact sdanbom support for troubleshooting or warranty assistance.