MEAN WELL SCP-50 Series 50W Power Supply with Battery Connection & Temperature Compensation

Overview

The MEAN WELL SCP-50 Series is a compact 50W single-output AC/DC switching power supply designed for systems that require regulated DC output together with battery connection, charging-voltage temperature compensation and output voltage status detection. It accepts a universal 85–264VAC input or 120–370VDC input and is cooled by free-air convection.

The series is available in two models. SCP-50-12 provides a 13.8V output rated at 3.6A with 49.7W rated power, while SCP-50-24 provides a 27.6V output rated at 1.8A with 49.7W rated power. Both models provide an adjustable output range of +15% / -5%, allowing the output voltage to be matched to the intended battery-supported DC system.

A dedicated B+ / B- battery connection is provided, while the main DC output is available through the +V / -V terminals. The SCP-50 Series also supports connection of an optional NTC temperature sensor through CN2, allowing the charging voltage to change according to ambient temperature. If the temperature sensor is not used, the charger continues to operate normally.

For status monitoring, the series provides an output voltage detection signal. The L signal indicates approximately output voltage +0.2–0.7V during AC OK operation and falls to 0V during AC failure, allowing external equipment to detect the supply status.

Built-in protection includes short circuit, overload, overvoltage and battery reverse-polarity protection. The series also features low no-load power consumption below 0.75W, LED power indication and a compact 129 × 98 × 38 mm enclosure, making it suitable for DC power systems that require battery connection and basic supply-status monitoring.

Features

• 50W-class single-output AC/DC switching power supply with dedicated battery connection
• Universal 85–264VAC input and 120–370VDC input range, with typical efficiency of 81% for SCP-50-12 and 85% for SCP-50-24
• SCP-50-12 provides 13.8V output rated at 3.6A, while SCP-50-24 provides 27.6V output rated at 1.8A
• Output voltage adjustable from -5% to +15% of the rated value for system and battery-voltage requirements
• Optional NTC temperature sensor connection supports automatic compensation of battery charging voltage according to ambient temperature
• Output voltage detection signal provides AC OK / AC Fail status information for external monitoring
• Short circuit, overload, overvoltage and battery reverse-polarity protection, with free-air convection cooling and a compact 129 × 98 × 38 mm enclosure

Need help choosing between the 13.8V and 27.6V versions? Compare SCP-50-12 and SCP-50-24 below.

Model Selection Guide for SCP-50 Series

The MEAN WELL SCP-50 Series includes two compact AC/DC power supplies with battery connection and temperature-compensated charging-voltage capability: SCP-50-12 and SCP-50-24.

Model selection is primarily determined by the required DC output voltage, load current and battery system voltage. Both models share the same 85–264VAC or 120–370VDC input range, battery connection, optional NTC temperature compensation, output voltage detection signal, protection functions and 129 × 98 × 38 mm enclosure.

SCP-50-12 – 13.8V Output

The MEAN WELL SCP-50-12 provides a 13.8V output rated at 3.6A with 49.7W rated power. Typical efficiency is 81%, and the output voltage can be adjusted approximately -5% to +15% from the rated value.

Choose SCP-50-12 when the connected DC load and battery-supported system require a nominal output around 13.8V and the required continuous load current does not exceed 3.6A.

SCP-50-24 – 27.6V Output

The MEAN WELL SCP-50-24 provides a 27.6V output rated at 1.8A with 49.7W rated power. Typical efficiency is 85%, and the output voltage can also be adjusted approximately -5% to +15% from the rated value.

Choose SCP-50-24 when the system requires a nominal output around 27.6V and the connected load current is within the 1.8A rated output capability.

How to Choose Between SCP-50-12 and SCP-50-24

Start with the required system voltage. Choose SCP-50-12 for a 13.8V output or SCP-50-24 for a 27.6V output.

Then confirm the required load current. SCP-50-12 provides up to 3.6A, while SCP-50-24 provides up to 1.8A. The connected load should remain within the rated output capability of the selected model.

Both models provide dedicated B+ and B- battery connections and support an optional NTC temperature sensor through CN2. When the sensor is connected, the output voltage changes with ambient temperature to provide charging-voltage temperature compensation. If the sensor is not used, the charger continues to operate normally.

Output Voltage Detection and Monitoring

Both SCP-50 models provide an L output voltage detection signal for external status monitoring. Under normal AC input, the L signal is approximately the output voltage plus 0.2–0.7V. During AC failure, the signal falls to 0V.

This allows an external controller or monitoring circuit to distinguish between normal AC operation and AC failure without requiring a communication interface.

Need help choosing the correct SCP-50 model? Start with the required output voltage and load current, then confirm the battery system voltage and whether temperature-compensated charging-voltage control is required.

Related MEAN WELL SCP Series Power Supplies

If the SCP-50 Series does not match your required output voltage, load power or battery-supported system requirements, compare the other MEAN WELL SCP Series power supplies according to output capacity, battery connection, monitoring functions and system voltage:

• SCP-35 Series – Lower-power SCP Series option for applications with lighter load requirements.
• SCP-75 Series – Higher-power SCP Series option for systems requiring more output capacity than SCP-50.

Need help choosing the right MEAN WELL SCP Series power supply?
Compare SCP-35, SCP-50 and SCP-75 based on required output voltage, load current, power level, battery requirements and monitoring functions.

Battery Connection, Temperature Compensation and Status Monitoring

The MEAN WELL SCP-50 Series provides dedicated battery connections, optional charging-voltage temperature compensation and an output voltage detection signal for battery-supported DC systems. These functions are available on both SCP-50-12 and SCP-50-24.

Battery Connection

The external battery connects through the dedicated B+ and B- terminals, while the main DC load connects to the +V and -V output terminals.

The battery terminals and main output terminals serve different functions, so the battery should be connected only to the designated B+ / B- connections.

Charging-Voltage Temperature Compensation

An optional NTC temperature sensor can be connected through CN2 to compensate the charging voltage according to ambient temperature.

With the reference 100kΩ NTC thermistor specified by MEAN WELL, the output voltage changes with temperature. For SCP-50-12, the reference output is approximately 14.4V at 0°C, 13.8V at 25°C and 13.2V at 50°C. For SCP-50-24, the corresponding values are approximately 29.3V, 27.6V and 26.4V.

If the temperature sensor is not connected, the charger continues to operate normally.

Output Voltage Detection

The SCP-50 Series provides an L output voltage detection signal for external status monitoring.

Under normal AC input, the L signal is approximately output voltage +0.2 to 0.7V. When AC input fails, the L signal falls to 0V.

This signal can be used by an external monitoring circuit or controller to distinguish between normal AC operation and AC failure.

Battery Reverse-Polarity Protection

The SCP-50 Series includes battery reverse-polarity protection by fuse.

The series also provides short-circuit, overload and overvoltage protection for the DC output.

Need wiring and mechanical details? Continue below for the SCP-50 mechanical drawing, terminal assignments, CN2 temperature sensor connection, dimensions and installation information.

Mechanical Dimensions and Installation

The MEAN WELL SCP-50 Series uses a compact enclosed chassis designed for integration into DC power and battery-supported equipment. Its free-air convection cooling supports installations where forced-air cooling is not required.

Dimensions

The SCP-50 Series measures 129 × 98 × 38 mm (L × W × H).

The mechanical drawing shows the AC input terminal block, DC output terminals, battery connections, CN2 temperature-sensor connector, LED indicator, internal adjustment point and mounting holes.

AC Input and DC Output Connections

AC input is connected through TB1, which provides terminals for:

• AC/L: AC line input
• AC/N: AC neutral input
• FG: Frame ground

The regulated DC output is available through TB2, with dedicated +V and -V terminals for the connected load.

Battery Connections

The SCP-50 Series provides dedicated B+ and B- battery connections.

The external battery should be connected only to these battery terminals. The +V / -V terminals are intended for the regulated DC output and should not be used as battery connections.

CN2 Temperature Sensor Connection

The CN2 connector is provided for an optional NTC temperature sensor used for charging-voltage temperature compensation.

The datasheet specifies a JST B2B-XH or equivalent connector, with a compatible JST XHP housing and JST SXH-001T-P0.6 terminal or equivalent.

If the temperature sensor is not connected, the charger continues to operate normally.

Mounting and Cooling

The SCP-50 Series is cooled by free-air convection.

The mechanical drawing provides the mounting-hole positions and enclosure dimensions required for equipment integration.

Operating Environment and Derating

The SCP-50 Series operates from -20°C to +60°C.

Output derating is required at higher ambient temperatures according to the derating curve. The datasheet also shows input-voltage derating at low AC input voltage.

Need complete installation details? Review the SCP-50 mechanical drawing for mounting dimensions, terminal locations, battery connections, CN2 sensor connection and derating information.

Applications

The MEAN WELL SCP-50 Series is designed for DC power systems that require regulated output together with external battery connection, charging-voltage temperature compensation and basic power-status detection.

With SCP-50-12 providing 13.8V output and SCP-50-24 providing 27.6V output, the series can be integrated into equipment where the load voltage, battery system and monitoring requirements match the electrical characteristics of the selected model.

• Battery-supported DC equipment requiring regulated DC output together with a dedicated external battery connection
• Battery charging systems where optional NTC temperature compensation is used to adjust charging voltage according to ambient temperature
• Power monitoring equipment using the output voltage detection signal to distinguish normal AC operation from AC failure
• Control and electronic equipment requiring 13.8V or 27.6V regulated DC power with battery support
• Enclosed electronic systems requiring a 129 × 98 × 38 mm power supply with free-air convection cooling

Need safety and compliance details for your project? Continue below to review protection functions, safety approvals, EMC compliance and operating conditions for the SCP-50 Series.

Certifications and Safety

The MEAN WELL SCP-50 Series is a compact AC/DC switching power supply with battery connection, designed as a component for integration into final equipment. Its safety, EMC and protection characteristics should be considered together with the requirements of the completed system.

Safety and EMC Compliance

Key safety and EMC information for the SCP-50 Series includes:

• UL62368-1 approved
• CB scheme based on IEC62368-1
• Design reference to BS EN/EN62368-1
• EAC TP TC 004 safety compliance
• BS EN/EN55032 (CISPR32) Class B EMC emission compliance
• BS EN/EN61000-3-2 and EN61000-3-3 EMC requirements
• BS EN/EN61000-4 series and BS EN/EN55035 EMC immunity requirements for light industrial environments
• EAC TP TC 020 EMC compliance

Isolation and Electrical Safety

Specified withstand voltage levels are:

• Input to output: 3KVAC
• Input to FG: 2KVAC
• Output to FG: 0.5KVAC

Isolation resistance is specified at 100MΩ between input-output, input-FG and output-FG when tested at 500VDC, 25°C and 70% RH.

Protection Functions

The SCP-50 Series provides protection against:

• Short circuit
• Overload
• Overvoltage
• Battery reverse polarity by fuse

Overload protection operates in hiccup mode and automatically recovers after the fault condition is removed. Overvoltage protection shuts down the output and requires the input power to be cycled for recovery.

Operating Environment and Final Equipment Integration

The SCP-50 Series operates from -20°C to +60°C, with output derating required according to ambient temperature and input voltage conditions.

The power supply is intended as a component for installation inside final equipment. After integration, the completed equipment should be reconfirmed to ensure that applicable EMC requirements are still met.

Need more product details before sending an inquiry? Review the model comparison, battery connection, temperature compensation, output voltage detection, mechanical dimensions and installation information above.