Combined Sterling 3500 watt inverter and 50 amp battery charger with automatic crossover switch (UPS).  Connect to 240v mains supply, 12v battery bank and the device you wish to supply with power.  The unit feeds the device with 240v from either the mains or via the battery bank (inverter) in the event of 240v mains power failure (automatically).  The built in mains charger keeps the battery bank charged and ready for use in the event of power failure.  Uses include water (bilge) pumps for flood prone property (basements), property prone to frequent power cuts, running central heating systems in event of power cut and electric gates.  Includes Remote Control.

Winner: Sailing Today Best Buy in Combi Test against Victron Mastervolt & Studer

Standard features

• 30 amp through current
• P.F.C. (power factor correction)
• Includes remote control with 10 metre cable
• 4 step progressive charging 8 battery type selector

If you require power assist, parallel connection, three phase output functions or any other enhanced combi features then this range is not for you . If you're not familiar with these things this ProCombi is perfect for you.

Modern combis are getting more and more complex, with each company trying to outdo the next with abilities beyond the understanding and requirements of most people. This detracts from the combis main strength of being easy to install and easy to use. There is, no doubt, there is a market for all the sexy functions but the vast majority of combi users simply do not need them and never will. Most people simply require the unit to act as a high performance constant current battery charger when on mains power then crossover to act as an efficient inverter when on battery – and that's it!

The problem with enhanced functions is, even if they are not used, they eat up valuable power. The more functions on a product running (even thought you do not use them) the higher the quiescent current on the inverter (the current the unit uses itself to operate). Complex combis at 12V can use as much as 9.5 amps whereas Pro Combi can use as little as 2 amps.

Sterling have reversed this trend with this Pro Combi range by stripping away the unnecessary features from a complex combi, not only saving money but also lowering the critical quiescent current draw. The end result is a simple, straightforward product that does what you think it should. Using our years of experience in this market we have tailored the product range to suit 90% of people purchasing Combis.

We have also added what we see as important features to this range that even the expensive combis do not have such as the ability to charge totally flat batteries and allow through power with no batteries connected.

On the battery charger side

• 4 step constant current battery charging
• 8 pre set battery type selector plus de-sulphation
• powerful charge rate
• will charge totally flat batteries
• PFC, draws about 30% less power than conventional units

On the crossover side

• 20 m/s crossover time, will not to lose any equipment due to power loss
• 30 amp through current ability on all models
• twin 30 amp / single 50 amp on the 3500 watt models

On the inverter side

• high overload ability
• high temperature rating
• low quiescent current
• power saver mode to automatically reduce power
• allows through power even with no batteries connecte

On the remote control

• ability to switch the unit on/off
• ability to select or de select power saver mode

General

• removable local panel to give remote control with waming and function I.e.d.
• remote on/off plus remote power saver on/off
• 10 metres remote cable
• almost 20 alarms/ warnings/and information

General Features for ProCombi S

• Remote control: front control panel removable as remote
• Size (mm) (w x h x l): 185 x 180 x  430 (1600 & 2500); 227 x 180 x 512 (3500)
• Weight: 20kg (1500); 20kg (2500); 24kg (3500)

Includes Remote Control