WELDMAN STRONG 50 Rectifier with 12V/24V Start – 40A Battery Charger & 300A Booster

In a busy workshop, a mechanic needs to bring a deeply discharged truck battery back to life and then start the engine immediately. The WELDMAN STRONG 50 Rectifier with 12V/24V Start handles both tasks without switching devices. Connect it to the battery, select the voltage, and the charger delivers up to 40 A effective current to restore capacity. When the vehicle must move now, the start function provides 300 A effective current for a powerful crank. This dual-purpose unit works on 12 V and 24 V systems, covering cars, vans, trucks, and agricultural machinery.

Key specifications

• Input voltage: 230 V AC
• Output charging voltage: 12 V / 24 V DC
• Effective charging current: 40 A (12 V and 24 V)
• Arithmetic charging current: 27 A (12 V and 24 V)
• Effective starting current: 300 A (12 V and 24 V)
• Arithmetic starting current: 200 A (12 V and 24 V)
• Maximum charging power: 1.0 kW
• Maximum starting power: 6.4 kW
• Battery capacity range: 40 Ah – 500 Ah
• Supported battery type: lead-acid (WET)
• Protection: overload, short circuit, reverse polarity
• Cooling: fan-cooled
• Ammeter: analog
• Colour: black

Why choose it

This rectifier combines a high-current charger and a starter in one robust cabinet. The fan cooling keeps it reliable during long charging sessions, while the analog ammeter gives a clear reading of the current. Protection against overload, short circuit, and reverse polarity prevents damage from common mistakes. With a wide battery capacity range, it adapts to small car batteries and large truck batteries alike.

Ideal use cases

• Workshops servicing mixed fleets of 12 V and 24 V vehicles
• Farms maintaining tractors and other agricultural machinery
• Roadside assistance for starting vehicles with flat batteries
• Garages charging batteries before installation or storage

Good to know

The unit operates from a standard 230 V AC outlet. Always select the correct voltage (12 V or 24 V) before connecting to the battery. The start function should be used in short bursts to avoid overheating. For best results, charge the battery fully before attempting to start the engine.