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Functional Parameters: Replace for PM4-55A, WF-9800 Series. This 55 Amp Converter/Charger is designed to convert 120 VAC to 12 VDC. It also provides low voltage power for charging on-board 12 VDC batteries, built-in 4 smart batteries charger maintains three charging modes. No need to rewire, simply install it. Wide Application: The 55 amp power converters is designed with frequency conversion to provide power for your RV, LED lights, CV radio, marine towing motor, 12V car audio, off grid lighting, and your house. As long as it is within this applicable voltage and current range, it can solve all your power supply needs 4 STAGE CHARGING MODE: Our rv converter 55 amp is divided into three stages of charging mode: Fast charging（Boost）, which can quickly restore depleted batteries to full voltage mode; Standard charging system（Norma），enables the battery to operate at full load at a safe speed to extend battery life; Trickle charging(Storage), Keep the battery fresh when the load is not active (storage function) FIXED VOLTAGE MODE: This mode can be used to directly power 12 Volt equipment and or maintain the battery at that voltage. ( With the unit off, move Switch A, right to “Fixed Voltage” then plug the unit into 110V power. Turn Switch B gently up or down to adjust the voltage between 13~16.5V until reaching your required output. ) Safety and Durability: This converter/charger features reverse polarity, overload and thermal protection to provide reliable, safe and clean AC/DC power to your devices. The built-in Level 3 charging system charges and maintains your RV battery, significantly extending battery life. Brand USSKYBOY Plug Type Type F Manufacturer USSKYBOY Model Number PM4-55A BuiltIn Media PM4 55 Amp RV Converter Input Voltage 110 Volts (AC) Output Voltage 13 Volts (DC) Mfr Part Number PM4-55A Warranty Description 1 year warranty