For years, RV owners upgrading to lithium batteries faced a frustrating problem: their existing converter was still programmed to charge lead-acid batteries, which meant either under-charging expensive lithium packs or risking damage from incorrect voltage profiles. The WF-8955-AD-REP eliminates that problem entirely. Its patent-pending Auto-Detect microprocessor reads your battery chemistry and selects the right charging algorithm automatically – every single time it cycles.Patent PendingNo ButtonsNo Switches
Detects lithium-ion or lead-acid automatically
940W output for full-featured RVs
Bulk, Absorption, Float for lead-acid
Replaces WF-8900 series converter section
Traditional lithium-ready converters require the RV owner to manually select a charging mode via a button or switch every time batteries are connected – and if you forget or select the wrong mode, your battery either gets undercharged or damaged. WFCO's Auto-Detect technology solves this permanently.
The Auto-Detect Process: When the WF-8955-AD-REP is powered on, the microprocessor samples the battery voltage and chemistry characteristics. It automatically determines whether lead-acid (flooded, AGM) or lithium-ion batteries are connected and immediately applies the correct multi-stage charging profile. If you ever swap battery types, the converter detects the change and adjusts automatically on the next charge cycle.
Why This Matters for Lithium Owners: Lithium-ion batteries require a two-stage charge profile (Bulk + Absorption) with no Float stage. Charging lithium batteries with a lead-acid Float voltage can cause trickle overcharging that degrades cells over time. The Auto-Detect system applies the correct profile every time, protecting your battery investment without any action on your part.
Why This Matters for Lead-Acid Owners: Lead-acid and AGM batteries benefit from three-stage charging that includes a Float maintenance mode to keep the battery topped off without overcharging. Converters that output a single fixed voltage leave lead-acid batteries either chronically undercharged or slowly overcharged. The Auto-Detect profile extends lead-acid battery life with proper, automatic multi-stage care.
Auto-Detect applies the correct profile every charge cycle. Switch battery types anytime – the converter adapts automatically on the next power cycle.
WFCO offers two versions of the Auto-Detect 55A upgrade. Choosing the right one depends on your existing hardware:
WF-8955-AD-REP – Converter Replacement Kit (This Product): • Complete kit: converter module + DC fuse board + mounting bracket + fasteners • Designed to replace the lower converter section of WF-8900 series power centers • Also compatible with other brands of RV power centers that use a removable converter section • Correct choice for upgrading any existing power center with a removable/replaceable converter section • Dimensions (kit with bracket): 12" W × 4.75" H × 7.65" D WF-8955-AD-MBA – Main Board Assembly (Different Product): • Board and components only – no bracket, no fuse board • Direct board-swap for existing WF-8955 series power center cabinets • Installs with 2 screws, 3 AC wires, 2 DC wires – approximately 10 minutes • Correct choice when you only need to swap the main board inside an existing WF-8955 cabinet When in doubt, choose the REP kit – it includes everything needed for the widest range of installation scenarios.
At 55 amps DC output, the WF-8955-AD-REP provides ample converter capacity for mid-size to large RVs with significant 12V electrical loads. The 55A output handles simultaneous demands from lighting, water pump, slide-out motors, fans, electronics, and battery charging without voltage sag or overload.
Steady 13.6V DC Output: Under normal operating conditions, the converter maintains a clean, stable 13.6V DC (Absorption mode nominal) that keeps electronics and appliances running properly without the voltage swings that cause flickering lights or erratic appliance behavior.
Regulation Accuracy: ±1% voltage regulation against input and load variations ensures consistent output even when shore power fluctuates or 12V loads change rapidly.
Variable-Speed Cooling Fan: The fan speed is automatically controlled by the DC load amperage – it runs quietly at low loads and ramps up only when output demand increases. This keeps the converter running cooler under heavy use while staying whisper-quiet when loads are light.
Over-Current Protection: Current-limiting circuitry automatically reduces output if loads exceed safe levels, then auto-recovers when the overload is removed. This protects both the converter and the RV's 12V wiring from damage during fault conditions.
Short Circuit Protection: Instantaneous shutdown on detected short circuit, with automatic recovery once the fault is cleared. No manual reset required for most short-circuit events.
Over-Temperature Protection: Thermal monitoring shuts the converter down if internal temperatures exceed safe limits, then automatically restores operation once the unit cools. This prevents permanent damage from sustained high ambient temperatures or blocked ventilation.
Over-Voltage Protection: Monitors output to prevent voltage spikes from reaching connected electronics and batteries.
Reverse Polarity Protection: DC output connections are protected against reverse battery connection by a fuse – the fuse absorbs the fault rather than damaging the converter. Replace with same-rated fuse after clearing the wiring error.
• A WF-8900 series WFCO power center (WF-8935, WF-8945, WF-8955, WF-8965, WF-8975) with a failing or single-stage converter section • Another brand's power center with a removable, replaceable converter section • A working power center cabinet and AC distribution panel you want to keep • Lead-acid batteries today and possible future lithium upgrade (Auto-Detect handles both) • Existing lithium batteries being charged by an old single-stage or lead-acid-only converter • Flickering lights, low battery voltage, or erratic charging from an aging converter • A need to upgrade charging intelligence without replacing the entire power center
The WF-8955-AD-REP is a complete replacement kit – not just a bare board. Everything needed to slide the new converter into your existing power center is included:
Skill Level: Intermediate electrical – RV technician or experienced DIYer familiar with 12V and 120V systems. Installation Process: 1. Disconnect shore power and battery connections 2. Open the existing power center access panel 3. Remove the old converter section (lower portion of power center) 4. Install the new DC fuse board from the kit 5. Slide the WF-8955-AD-REP converter into the bracket position 6. Connect AC input leads (3 wires), DC output leads (2 wires) 7. Secure with provided fasteners 8. Restore power and verify operation Wiring: No additional wiring runs required. Connects to existing AC and DC leads in your power center. Auto-Detect Setup: None required. The unit detects battery chemistry automatically on first power-up and every subsequent charge cycle. Hi-Pot Testing: Unit accepts hi-pot (high potential) testing – fully compatible with RV industry inspection and certification procedures.
One of the most compelling reasons to choose the Auto-Detect REP over standard converter replacements is future flexibility. If you currently run lead-acid or AGM batteries and are considering upgrading to lithium in the future, the WF-8955-AD-REP handles that transition without any additional hardware changes. Install it today for your lead-acid batteries – switch to lithium next season – the converter adapts automatically.
Conversely, if you've already upgraded to lithium but your existing converter predates lithium-compatible technology, the WF-8955-AD-REP immediately corrects the charging profile mismatch, protecting your battery investment going forward.
The Result: A single purchase upgrades your power system for any battery chemistry you might use now or in the future – eliminating the need for another converter replacement when your batteries evolve.
Older Single-Stage Converters: • Output a fixed voltage (typically 13.6V) continuously • Cannot fully charge depleted batteries (need 14.4V bulk phase) • Can overcharge fully charged batteries over time • No adaptation for different battery states or chemistries • Result: chronically undercharged batteries, shortened battery life WF-8955-AD-REP 3-Stage Smart Charging: • Bulk Phase (14.4V): Pushes maximum safe current into depleted battery for fast recharge • Absorption Phase (13.6V): Holds nominal voltage while battery reaches full capacity • Float Phase (13.2V): Gentle trickle maintains charge without overcharging (lead-acid only) • Result: faster recharging, full capacity utilization, dramatically extended battery life
The WF-8955-AD-REP is designed to replace the lower converter section of power centers with removable converter modules. Verify your existing power center has a removable converter section before ordering. Confirmed Compatible Power Centers: • WFCO WF-8900 Series (WF-8935, WF-8945, WF-8955, WF-8965, WF-8975) – all variants including AN, PEC • Other brands with removable converter sections (consult WFCO's cross-reference guide) Not the Right Product If: • Your power center does not have a removable converter section (non-modular design) • You need to replace only the main board inside an existing WF-8955 cabinet (use WF-8955-AD-MBA instead) • Your system requires a different amperage (35A = WF-8935-AD-REP, 45A = WF-8945-AD-REP) If unsure about compatibility, check the WFCO Cross-Reference Guide at wfcotech.com or contact WFCO support at [email protected].
• Lights flicker or dim when connected to shore power • Batteries chronically low despite being plugged in • Converter runs hot or fan runs continuously • Single-stage old converter with new lithium batteries • No multi-stage charging – fixed voltage output only • Converter section physically failed or damaged • Upgrading to lithium and need chemistry-aware charger
Lead-Acid (Flooded): Full 3-stage profile Bulk 14.4V → Absorption 13.6V → Float 13.2V AGM (Absorbed Glass Mat): Full 3-stage profile Bulk 14.4V → Absorption 13.6V → Float 13.2V Lithium-Ion (LiFePO4): 2-stage profile Bulk 14.4–14.6V → Absorption 13.6V → No Float Auto-Detect selects the correct profile automatically.
Industry Leader: WFCO (Arterra) is the #1 power center supplier to the North American RV industry Innovation: First to market with patent-pending Auto-Detect battery chemistry technology Built for RV Use: Engineered specifically for the power demands, temperature ranges, and installation constraints of recreational vehicles Parts Availability: Nationwide dealer and service network with widely available replacement components Technical Support: WFCO support team available at [email protected] FCC Class B Compliant: Designed to minimize interference with TV, radio, and other signals
• Disconnect shore power AND battery before beginning installation • Verify power center has a removable converter section before ordering • Reverse polarity protection requires fuse replacement if triggered – use same-rated fuse • Auto-detect profile applies at each power cycle – no manual intervention required • Cooling fan requires adequate airflow around the converter – do not obstruct ventilation • For installations requiring motor-aid function, confirm compatibility before purchase • Consult WFCO cross-reference guide for non-WFCO power center installations
• Disconnect all power before installation – Disconnect shore power AND battery connections before opening the power center or touching any wiring • 120V AC is present inside power centers – Serious shock hazard; only qualified personnel should work inside the power center housing • Verify compatibility before ordering – This kit only fits power centers with a removable/modular converter section • Reverse polarity fuse – If reverse polarity protection activates, replace the fuse with identical rating before restoring power; do not bypass • Do not block ventilation – Converter requires airflow for thermal management; blocked vents will trigger over-temperature shutdown • Auto-recovery after faults – Unit automatically restores operation after most fault conditions; investigate root cause before assuming the unit has failed • Hi-pot testing compatible – Unit accepts standard RV industry hi-pot testing procedures without damage