Pro Charge Ultra Marine Battery Charger (12V, 10–60A Range, 3 Outputs, LED Display)

The Sterling Pro Charge Ultra represents the pinnacle of onboard battery charging technology – a series that combines versatility, power, and reliability to meet the demands of even the most rigorous marine or off-grid applications. These chargers come in various models (for example, 10A, 20A, 30A, 40A, 50A, 60A at 12V), allowing you to choose precisely based on your battery bank size and onboard consumption. However, all models share key features that set them apart in the market:

• Wide AC Input: Pro Charge Ultra automatically adapts to input voltages from 80V up to 270V AC, covering the full global spectrum. Whether you’re plugged into a small marina with low voltage or traveling overseas to a country with a different mains standard, the charger will work flawlessly. The frequency range of 40-70Hz means even unconventional power sources (like certain inverter generators) won’t faze it. This universal input capability removes worries about blowing a charger or undercharging your batteries due to “bad power”.
• Multiple Outputs: One Pro Charge Ultra charger can replace several separate chargers – it features up to 3 isolated outputs, allowing it to charge three different battery banks simultaneously. For example, a typical sailboat setup: one output to the engine start battery, a second to the house battery bank, a third to a bow thruster or navigation electronics battery. The charger monitors each bank and automatically adjusts current – if one battery is full, it directs more resource to the others. This ensures balanced, fast charging without the need for extra splitters or special relays.
• Advanced Charging Algorithms: With 11 built-in programs, these chargers can optimally charge different battery types. They cover standard flooded lead-acid, AGM (Absorbed Glass Mat), GEL, and even more specialized ones like Traction (deep cycle) or Spiral cell batteries. Notably, there’s a profile for Lithium batteries (LiFePO4) – as more yachts and RVs transition to lithium iron phosphate for their superior lifecycle and energy density, the Pro Charge Ultra is ready with an appropriate charging algorithm (higher bulk voltage ~14.6V and no float stage, to avoid overcharge). Additionally, the charger allows a custom mode where you can set your own voltages and timers – useful for any unique banks or future battery technologies.
• Active Battery Care: These chargers don’t just stop at “float.” They are designed to keep batteries in peak condition over time. For example, at set intervals they can perform an equalization charge – a controlled over-voltage charge for flooded/traction batteries intended to break down sulfate crystals and equalize the cells. This significantly extends battery life and recovers capacity. Of course, this function only activates on suitable battery types and can be configured or turned off as needed.
• Display and Monitoring Ease: On the front panel of a Pro Charge Ultra, you’ll find a 32 LED indicator array laid out as a graph and sets of status lights. This “matrix” actually conveys surprising detail – an approximation of the charging current (via a percentage bar), the current voltage (via numeric LED segments or color bands), and the mode it’s in (with dedicated LEDs for Bulk, Absorption, Float, Equalize, etc.). That means even without a separate remote panel, you can see what’s happening directly on the unit. If the charger is mounted in a visible spot in the engine or electrical compartment, one quick glance tells you everything’s okay. If something is wrong, a specific fault LED will alert you.
• Durability & Serviceability: The Ultra series is built for professional use – the cooling fan is thermostatically controlled and rated for continuous duty in hot engine rooms. All sensitive electronic parts are shielded against input and output surges. There are fuses for reverse polarity (in case someone accidentally hooks up the battery incorrectly) – these will blow to protect the electronics. The casing is robust yet designed for maintenance: a modular construction assembled with screws, meaning a service technician can replace a board or fan if needed, without you having to replace the whole unit. Designed and constructed to high standards, these chargers have a long service life – a fact backed up by the 5-year warranty. This gives you peace of mind that your investment is protected for the long haul.

Recommended Use: The Pro Charge Ultra range covers virtually every scenario – from small boats (with 1-2 batteries) to large yachts with complex banks. For example:

• The 10A model is suitable for a small motorboat or sailboat up to ~20–25 ft with a single ~100Ah battery, where the charger’s main role is to maintain the battery when docked.
• The 20A or 30A models – excellent for family yachts around 27–35 ft with two banks (start + house ~200-300Ah total). These models provide enough current to fully charge the batteries overnight at the marina or in a few hours of generator runtime.
• The 40A and 50A units – mid to high-range, ideal for motor yachts and catamarans around 40-50 ft, where there are multiple large batteries (total capacity 400-600Ah). The charger will handle heavy discharges, refilling to 80% quickly and then gently topping up to 100% before the next day’s usage.
• The 60A – the top 12V model, aimed at yachts with very high energy demands or larger commercial/research vessels (for instance, 3 banks of roughly 200Ah each). With this charger, downtime for recharging is minimized. Two of these units can be paralleled (for ~120A charging) or used in series for 24V systems (60A at 12V in series gives 30A at 24V).

Additionally, these chargers are ideal for long-term dockside or RV use where they remain connected to mains power indefinitely – their smart maintenance means you can leave the batteries on float all winter without worry. They will maintain an optimal charge, periodically perform a refresh charge, and your batteries will be “as fresh as new” come spring.

Regardless of the model, the entire Pro Charge Ultra series provides you with a professional-grade charging solution – fast, safe, and efficient charging that maximizes the life and performance of your batteries.