r Combi Chargers/ Inverters - Sterling Pro Combi Pure Sine Wave Inverter / Charger 12v/3500W/55A
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Sterling Pro Combi Pure Sine Wave Inverter / Charger 12v/3500W/55A

Manufacturers Part Number: PCS123500

(£1,499.95 Inc VAT)

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Sterling Pro Combi Pure Sine Wave Inverter / Charger 12v/3500W/55A

The new Pro Combi range is designed to be very competitive, no frills, high performance, and value for money products, presented in a simple, easy to install and use style.
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 out do the next with abilities beyond the understanding and requirements of most people. This detracts from the combi’s main strength of being easy to install and easy to use. There is, no doubt, a market for the advanced 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 cross over 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 though 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 A, whereas, Pro Combi can use as little as 2A.
Also, a lot of the expensive combis do not even have a power save function which can drop the combi power consumption to as little as 0.2A when off load, some combis continue to consume 2A + even when there is no load.
Sterling has reversed this trend with this Pro Combi range by stripping away the unnecessary features from a complex combi saving money. The end result is a simple, straight forward 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.


Standard Features

  • 30 amp through current
  • P.F.C. (power factor correction)
  • Includes remote control with 10m cable.
  • 4 step progressive charging
  • 8 battery type selector
  • Charger only select option (on S models only)
  • Earth - neutral link when on inverter mode to comply with latest regulations

Inverter specification output



Output Wave Form:

Pure Sine Wave

Output continuous Power watts:

Continuous 1500 / 2500 / 3500

Output continuous power VA:

Power Factor:

0.9 - 1.0

Nominal output Voltage RMS:


Max Voltage RMS:


Output Voltage Regulation:

+/- 10% RMS

Output Frequency:

50HZ +/- 0.3Hz or 60Hz +/- 0.3HZ

Transient Response Time:

<150ms; 0% to 100% RCD load

Nominal Efficiency:


Surge Ratings:

PQS1500 = 4500VA,  PQS2500 = 7200VA

Online current consumption at 12V/24V:

12V 1.2A, 24V on 1500 - 2500 sine,  4.5A for 3500 unit

Power Saver Mode Current Consumption:

12V 0.4, 24V 0.2

Short circuit Protection:

yes, less than 3 cycles

Charger Mode Specification

Input Voltage Range:


Output Voltage:

Dependant on battery type selection

Output Current 12V Model:

1600 - 40A, 2500 - 55A

Output Current 24V Model:

1600 - 20A, 2500 - 25A

Battery Initial Voltage for Start Up:

0 - 15V x2 for 24V

Over Charge Protection Shutdown:

15.7 12V x2 for 24V


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This product was added to our catalog on Friday 05 December, 2014.
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