WF-9855 55 Amp RV Power Converter/Charger - Reliable 55A Replacement

In this review the WF-9855 55 Amp RV Power Converter/Charger is assessed as a straightforward, heavy-duty replacement for deck-mounted WF-9800 series units. It is best for RV owners who need a dependable 55 Amp DC source and prefer an uncomplicated upgrade that emphasizes steady charging and long-term reliability. The single biggest reason to buy is its consistent 55 Amp output combined with an automatic three-stage charging system that supports both lithium and lead-acid batteries, which keeps onboard electronics and battery banks healthy over time.

Key Features

• 55 Amp DC Output: Provides a robust and continuous 55 Amps of DC power to run RV appliances and charge batteries without frequent voltage dips.
• Three-Stage Charging: Automatic Float (13.2 VDC), Absorb (13.6 VDC), and Bulk (14.4 VDC) modes help extend battery life and improve charging efficiency for different battery chemistries.
• Intelligent Current Limiting: Built-in electronic protection shuts down output during overloads or short circuits to protect wiring and connected devices.
• Quiet Operation: A thermostatically controlled cooling fan runs only when needed, reducing cabin noise compared with continuously running fans.
• Durable Construction: Built for longevity with a design intended to withstand typical RV environments and reduce the need for premature replacement.
• Clean Power Delivery: Delivers consistent, clean DC output that performs well even without additional battery filtering in place.

Who It's For

The WF-9855 is aimed at RV owners, technicians, and DIYers replacing a deck-mounted WF-9800 series converter charger or upgrading to a reliable 55 Amp unit. It suits those who prioritize a straightforward fit-and-forget power solution with built-in safety features and a three-stage charging profile that supports both lithium and lead-acid batteries.

It may not be the right choice for campers who need integrated battery monitoring, remote control features, or advanced filtering options; those users should consider models with telemetry or built-in battery filters. Also, buyers who require more than 55 Amps should look at larger capacity units.

Pros & Cons

Pros

• Consistent 55 Amp output delivers reliable power for typical RV loads and charging needs.
• Automatic three-stage charging (Float, Absorb, Bulk) helps maximize battery longevity for both lithium and lead-acid chemistries.
• Intelligent current limiting and thermal fan control add safety and reduce unnecessary noise.
• Generally easy to install and fits as a replacement for deck-mounted WF-9800 series units according to multiple users.

Cons

• Some customers reported mixed functionality, with a few units not working on arrival, so careful testing on installation is advisable.
• Lacks advanced telemetry or integrated battery filtering for users who want detailed battery diagnostics or extra filtering hardware built in.

Specifications

Model	WF-9855-AD-CB
DC Output	55 Amp
Charge Stages	Bulk 14.4 VDC, Absorb 13.6 VDC, Float 13.2 VDC
Battery Types	Supports lithium and lead-acid
Cooling	Thermostatically controlled fan
Protection	Electronic current limiting for overload and short circuit

Our Verdict

The WF-9855 is a practical, value-oriented replacement converter/charger for RV owners who need a dependable 55 Amp DC source with sensible safety features. Its three-stage charging profile and quiet, demand-driven fan make it a good choice for prolonging battery life and maintaining onboard systems, though buyers who need telemetry or integrated filtering should look elsewhere.

Frequently Asked Questions

Is this unit compatible with lithium batteries?
Yes. The converter has charging modes suitable for lithium and lead-acid batteries with defined Float, Absorb, and Bulk voltages.

Will the fan run all the time?
No. The fan is thermostatically controlled and activates only when needed to reduce noise and wear.

What protection does it provide for shorts or overloads?
It includes intelligent electronic current limiting that will shut down output in the event of an overload or short circuit to protect the system.