Pro Charge Ultra (10A to 60A and 12V, 24V, 32V, 36V, 48V models available) (5yr Warranty)

2015-2022 Pro Charge Ultra Instructions

2022+ Pro Charge Ultra Instructions

UL certificate

What size of charger do I need?
Most companies recommend a battery charger to be about 10% of the amp hr capacity of the batteries requiring to be charged. However, if you have a generator set onboard and you wish to charge your batteries faster -  ie, to save fuel, then depending on your budget, you can easily double the charger size to reduce your generator running hours and achieve the charge faster.

Larger requirements?
After your final calculations are made, if you require a larger charger, then the Sterling range, because they are digital chargers can be added together. For larger requirements simply add units (2-3-4 etc) together to meet your requirements. Multiple smaller units can offer some advantages over 1 larger unit: They tend to be lower cost, have a built in redundancy, (in event of one failing) and enables you to switch one off in the event of low shore power facility.  

Power Factor Correction
Power efficiency of the Pro Charge Ultra is significantly higher than its predecessors. The PCU runs at >90% efficiency and the power factor is rated at 0.99PFC this is in contrast to a non-PFC charger which runs at approximately 65% efficiency. Thus, the same power output with a reduced power input saving you money on kilowatt-hours. Other major benefits of PFC allows the unit to run off a dirty / modified / quasi sine wave from a generator (example). The other advantage of this technique is less heat is liberated during operation, therefore reduced use of fan.

Synchronized Rectification
Modern, synchronized rectification with MOSFET technology makes the Pro Charge Ultra Series 9% more effective. Less heat liberated and increased efficiency are also features of this latest technology.  Boasting an elegant yet functional design.

The Pro Charge Ultra housing was designed by a renowned American product designer. In the foreground stands optimal function and clean lines. The housing is made of plastic and the back is made of well protected metal plate with the latest corrosion coatings, all other metal fixtures and fittings are stainless steel or non ferrous.

11 preset charging algorithms & 1 custom set
The Pro Charge Ultra has 11 different charging characteristics for corresponding types of batteries: Gel, AGM, sealed, open, calcium, LiFePO4. If these should not suffice there is 1 customizable setting which the user can set themselves - simply enter the absorption and float voltages then press enter and the settings save.

Automatic Desulphation / Equalization
Every 7-10 days the Pro Charge Ultra undertakes a desulphation / equalisation and anti-stratification program which keeps your batteries young and rejuvenated.

Performance monitoring LED bar
A bar of LEDs display the percentage to which the Pro Charge Ultra battery charger is operating at. This is easily and quickly recognised at a glance and can be easily analysed.

32 LED display
32 LEDs built in to the front panel provides all the necessary information about the charger including: charging status, battery chemistry select, temperature and voltage warnings along with many others.

Redundant high voltage protection device
In the event of a failure of the main processor this unit provides another safety system to shut off the device.  Doubling the levels of security.

 Variable fan speed
The internal temperature of the device ultimately runs the speed of the fan. This guarantees a minimum possible noise.
So called ‘thermostatically controlled force draft cooling’

Three isolated charge outputs (PCU 12V/10A has 2 outputs)
The Pro Charge Ultra has 3 isolated charging outputs. 3
batteries or battery banks can charge without the batteries themselves being interconnected, e.g. Starter, domestic and generator starter battery.

Power Factor at 230V

Ripple noise (R.M.S.)