Pro Charge Ultra | 48V 15A Charger

Pro Charge Ultra – The ultimate marine battery charger from Sterling Power

5-year warranty

Sterling Power has poured its decades of experience in charging technology into the development of the Pro Charge Ultra series – the result is a charger that impresses in both tests and real-world use. In its very first comparative test with Sailing Today Magazine, it outperformed established brands like Mastervolt and Victron and was recognized as a premium product: "Probably the most flexible marine charger on the market." The Pro Charge Ultra also won the Innovation Award at IBEX in Kentucky, the largest international boatbuilding exhibition in the USA.

Higher demand? Easily expandable.

Sterling Power offers the possibility of digitally connecting multiple devices. Instead of one large device, two, three, or more smaller units can be used – this saves costs, provides redundancy in case of failure, and allows for flexible use with limited shore power.

High efficiency through modern technology

Thanks to active Power Factor Correction (PFC), the Pro Charge Ultra operates with over 90% efficiency and a power factor of 0.99. Compared to older chargers, it consumes less energy, generates less heat, and can even be operated without problems with modified sine waves (e.g., generator power).

Technology meets design

Modern MOSFET rectifier technology ensures additional efficiency gains. The housing, designed by a US designer, combines functionality with a clean, modern look. All materials used are optimized for marine applications – rustproof and corrosion-resistant.

Suitable for all battery types

With 11 preset charging programs for gel, AGM, open lead-acid, calcium and LiFePO4 batteries, as well as a freely programmable mode, the Pro Charge Ultra offers maximum flexibility – entirely without a computer, adjustable directly via the front panel.

Automatic battery care

An integrated maintenance program performs desulfation and equalization charging every 7–10 days – for long battery life and consistent cell voltage.

Clear and concise

An LED bar displays the current load, while 32 additional LEDs provide information about charge level, warnings, temperature, and more. Two digital displays show voltage and current in real time.

Further features at a glance

• 3 isolated charging outputs for separate battery banks (e.g. starter, consumers, generator)

• Variable power limiting (100%, 75%, 50%, 25%) – ideal for limited power supply

• Temperature-controlled fan – quiet and effective

• Drip water protection for vertical mounting (IP22, ABYC compliant)

• Wide range input: 80-270V AC / 130-320V DC

• Compact dimensions and low weight – ideal for onboard installation

• Optional remote control with all important displays and control functions

Conclusion

Sterling Power's Pro Charge Ultra series combines modern technology, high efficiency and practical functions in a compact device – ideal for anyone looking for a reliable and flexible charging solution for maritime use.