sdanbom WF-9855 55A RV Power Converter — 12V DC Output, Lead-Acid & Lithium Selectable Charging

Designed as a drop-in replacement for many WF-9800 series converters, the WF-9855 delivers up to 55 amps of DC output while offering a selectable charging profile for lead-acid and lithium batteries, integrated protections, and a smart cooling fan that runs only when needed. It’s built to power house batteries and 12V circuits in trailers, campers, and motorhomes without introducing interference to radios or TVs.

How does the WF-9855 handle both lead-acid and lithium batteries?

The converter includes two distinct charging modes selectable with a push button and indicated by an LED. Pressing the button switches the unit into lithium mode (LED off); leaving it unpressed keeps the converter in lead-acid mode (LED on). This lets you use the same power converter after upgrading battery chemistry or when servicing mixed-battery systems.

• Push-button mode switch for easy selection
• LED indicator shows current charging mode
• Appropriate charge profiles for Pb and Li chemistries
• Works with common 12V RV battery banks

Will the WF-9855 fit my existing WF-9800 series installation?

The WF-9855 is engineered to replace many WF-9800 series converters and matches common mounting and electrical characteristics. It accepts 105–130VAC, 60Hz input and outputs up to 55A DC, making swap-outs straightforward in most trailers and camper applications.

• Direct replacement for many WF-9800 models
• Input range 105–130VAC, 60Hz
• 55A continuous DC output capacity
• Standard wiring layout for easy installation

How does the WF-9855 manage heat and electrical safety?

The unit uses a smart, quiet cooling fan that activates only under load when extra cooling is required, reducing noise during light use. Built-in protections guard against over-current, abnormal voltage, temperature extremes, and reverse polarity to protect both the converter and connected equipment.

• Thermally controlled fan for minimal noise
• Over-current and over-voltage protection
• Temperature monitoring to prevent overheating
• Polarity protection to avoid installation mistakes

What technical specs matter for RV use?

The WF-9855 delivers 55 amps of DC output at 12V and expects typical RV shore power between 105 and 130VAC. The unit is engineered to meet high technical standards so it won’t interfere with TV or radio reception and provides reliable DC power for lights, pumps, and accessories.

• Output current: 55 A DC
• Input voltage: 105–130 VAC, 60 Hz
• Designed to minimize radio/TV interference
• Compatible with typical RV 12V systems and battery banks

Who is this for: The sdanbom WF-9855 is aimed at RV owners, mobile electricians, and fleet maintenance technicians who need a dependable, quiet, and flexible 12V power converter. It’s best for users replacing older WF-9800 series converters, upgrading battery chemistry to lithium, or standardizing converters across trailers. If you want a straightforward installation, selectable charge modes, and built-in protections for everyday RV power needs, this converter is a practical choice. For safe installation, disconnect shore power first and ensure all wiring is tight; contact sdanbom support for troubleshooting, warranty, or compatibility questions.