Instruction Manual PDF

Product Information PDF

Dimensions 3500W

Dimensions 1600W & 2500W

DC (V)	Power (W)	Charger (A)	Code
12V	2500W	80A	PCS122500
12V	3500W	100A	PCS123500
24V	2500W	35A	PCS242500
24V	3500W	50A	PCS243500

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

Pro Combi S Euro pure sine wave 220V 50Hz Euro Standard

DC Voltage	Power at 25 deg C (Watts)	Part Number
12	2500	PCS122500
12	3500	PCS123500
24	2500	PCS242500
24	3500	PCS243500

Pro Combi S pure sine wave 110V 60Hz USA Standard

DC Voltage	Power at 25 deg C (watts)	Part Number
12	2500	PCSA122500

General Specifications

Weight 2500W / 1500W

18.5Kg

Weight 3500W

27.0Kg

Dimensions 2500W LxHxD 380mm x 220mm x 190mm | 3500W LxHxD 550mm x 220mm x 190mm

Specifications	Euro	USA
Input Wave Form:	Pure Sine Wave	Pure Sine Wave
Nominal Voltage:	Input 230V AC	Input 110V AC
Low Voltage Trip:	184V +/- 4%	92V +/- 4%
Minimum Engage:	194V +/- 4%	95V +/- 4%
High Voltage Trip:	253V +/- 4%	126V +/- 4%
High Voltage Re Engage:	243V +/- 4%	121V +/- 4%
Max input AC Voltage:	270V RMS	135V RMS
Nominal input frequency:	50Hz or 60 Hz auto detect	50Hz or 60 Hz auto detect
Low Frequency Trip:	47Hz for 50Hz, 58Hz for 60Hz	47Hz for 50Hz, 58Hz for 60Hz
High Frequency Trip:	53Hz for 50Hz, 62Hz for 60Hz	53Hz for 50Hz, 62Hz for 60Hz
Output Wave Form	(on by pass mode) same as input	(on by pass mode) same as input
Overload Protection:	Circuit breaker	Circuit breaker
Short Circuit Protection:	Circuit breaker	Circuit breaker
Transfer Switch Rating:	1500 - 2500W = 30A the 3500W = 50A	1500 - 2500W = 30A the 3500W = 50A
Efficiency on line Transfer Mode:	95%+	95%+
Line Transfer Time:	20ms	20ms
Bypass without battery connected:	yes	yes
Max bypass current:	30 amps	30 amps
Bypass overload current:	35 amps: alarm	35 amps: alarm

Inverter specification output

	Euro	USA
Output Wave Form:	Pure Sine Wave	Pure Sine Wave
Output continuous Power watts:	Continuous 1500 / 2500 / 3500	Continuous 1500 / 2500 / 3500
Output continuous power VA:
Power Factor:	0.9 - 1.0	0.9 - 1.0
Nominal output Voltage RMS:	230V	115V
Max Voltage RMS:	260V	130V
Output Voltage Regulation:	+/- 10% RMS	+/- 10% RMS
Output Frequency:	50HZ +/- 0.3Hz or 60Hz +/- 0.3HZ	50HZ +/- 0.3Hz or 60Hz +/- 0.3HZ
Transient Response Time:	<150ms; 0% to 100% RCD load	<150ms; 0% to 100% RCD load
Nominal Efficiency:	>88%	>88%
Surge Ratings:	PQS1500 = 4500VA, PQS2500 = 7200VA	PQS1500 = 4500VA, PQS2500 = 7200VA
Online current consumption at 12V/24V:	12V 1.2A, 24V on 1500 - 2500 sine, 4.5A for 3500 unit	12V 1.2A, 24V on 1500 - 2500 sine, 4.5A for 3500 unit
Power Saver Mode Current Consumption:	12V 0.4, 24V 0.2	12V 0.4, 24V 0.2
Short circuit Protection:	yes, less than 3 cycles	yes, less than 3 cycles

Inverter specification input

	Euro	USA
Nominal Input Voltage:	12V or 24V depending on model	12V or 24V depending on model
Minimum Start Voltage:	10V for 12V models, 20V for 24V models	10V for 12V models, 20V for 24V models
Low Battery Alarm:	10.5V for 12V models, 21V for 24V models	10.5V for 12V models, 21V for 24V models
Low Battery Trip:	10V for 12V models, 20V for 24V models	10V for 12V models, 20V for 24V models
High Voltage Alarm:	15.5V for 12V models, 30V for 24V models	15.5V for 12V models, 30V for 24V models
Power Saver:	Below 20 Watts when enabled	Below 20 Watts when enabled
Power Saver:	Can be switched on/off with remote control	Can be switched on/off with remote control

Charger Mode Specification

Input Voltage Range:	196-245V	96-130V
Output Voltage:	Dependant on battery type selection	Dependant on battery type selection
Output Current 12V Model:	1600 - 50A, 2500 - 80A	1600 - 50A, 2500 - 80A
Output Current 24V Model:	1600 - 25A, 2500 - 40A	1600 - 25A, 2500 - 40A
Battery Initial Voltage for Start Up:	0 - 15V x2 for 24V	0 - 15V x2 for 24V
Over Charge Protection Shutdown:	15.7 12V x2 for 24V	15.7 12V x2 for 24V

How to compare model ratings with other Combis:
Watts vs VA : the truth
The most significant issue to be aware of is how output ratings are massaged to appear better than the competition. You might be excused for thinking that a unit with ‘3000’ written on it, for example, means that it will deliver 3000W continuously. This is not necessarily the case if you look at the small print.

Have you ever found it strange that the product you want to run (i.e. the hair dryer, washing machine, TV, etc), has the power consumption shown in watts, yet the inverter/ generator companies give you the rating in VA, and when you put your 1000W product on a 1000 VA inverter it does not work. In the small print you find out that the 1000 VA inverter is only 700 watts for 10 mins then it over heats- this simply cannot be right.

In the eyes of the unknowing consumer, rating a power product in VA is a simple way of using meaningless figures to confuse and make performance appear better than it really is. Unfortunately this practice is still allowed in Europe (European standards committees are looking into this practice) unlike the USA where there are recognised standards (eg ABYC) and you can be sued for publishing misleading information and incorrect ratings. The only true rating, without confusion, is in watts, using a simple resistive load with unity power factor, such as an electric heater / standard light bulb, etc. This method gives a lower correct figure, however, it is not what the marketing teams involved in promoting power products want to see.

Take, for example, a 3000 Victron Multi that is perceived by the public to be 3000W continuously rated. If, however, you read the Victron specification for watts at 40 degC the actual power is 2200W.The Sterling 2500W Combi delivers 2300W which in fact makes it a more powerful unit. This distortion is not limited to Victron, unfortunately most, if not all, the European manufacturers push model figures to the realms of fantasy in spiralling competitiveness and in order to confuse and impress the public who believe that these figures are actual continuous power rating.

Furthermore, the effects of temperature and the duration of duty (i.e. how long a load is maintained) can also be used to manipulate ratings. It is much harder for a unit working in 40 degC ambient temperature than in 25 degC, just as it is harder to run at a higher load for extended periods. Therefore, a unit rated for short periods at a cooler temperature will also appear more powerful.
To illustrate, taking data published by Victron Energy and Mastervolt, the following comparison can be made

Model/product	Public perceived power	True Cont. Watts @ 40degC
Victron Phoenix MultiPlus 12/3000/120	3000W	2200Watts
Mastervolt Mass Combi 12/2500-100	2500W	Not stated
Sterling Pro CombiS or Q 12/2500	2500W	2300Watts
Victron Quattro 12/5000/200	5000W	12V / 3000Watts
Sterling 3500 combi	3500W	3300Watts

The simple truth of the matter is VA means nothing. If you want to know how much power your inverter is going to give you then ask for the rating in watts at 40 deg C , all the other ratings should be kept for the comic books where they belong. ProCombi has the lower value in the model name but, in fact, is the more powerful of the bunch when like for like ratings are compared making it even better value for money than you thought. With the Sterling unit you get what you think you should be getting, and it does what it says it does on the box.
The sooner ratings have a legal recognised standard like the U.S.A. the better for everyone.

On the battery charger side
1) 4 step constant current battery charging
2) 8 preset battery type selector plus de-sulphation
3) Powerful charge rate
4) Will charge even with totally flat batteries
5) PFC, draws about 30% less power than conventional units

On the crossover side
1) 20 m/s crossover time, will not to lose any equipment due to power loss
2) 30A through current ability on all models
3) Twin 30A / single 50A on the 3500W models

On the inverter side
1) High overload ability
2) High temperature rating
3) Low quiescent current
5) Power saver mode to automatically reduce power
6) Allows through power even with no batteries connected
7) Neutral earth link to enable RCD breakers to work

On the remote control
1) Ability to switch the unit on/off
2) Ability to select or de select power saver mode

General
1) Removable local panel to give remote control with warning and function LED
2) Remote on/off plus remote power saver on/off
4)10 metres remote cable
5) Almost 20 alarms / warnings / information
There are 2 main models the Pro Combi Q ( for quasi-sine wave ) and the Pro Combi S ( for pure-sine wave )

So the simple question is, what best suits your needs?
Pro Combi Q, (quasi-sine model) suitable for most installations, where you would use a microwave, fridge, hair dryer, vacuum cleaner, kettle, computer, etc The vast majority of products will run on quasi-sinewave. Hi Fi could have a buzz on the speakers and older non flat screen TVs may have a line on the screen. It is not possible for us to say what item may have a problem, if any.
Pro Combi S (pure sine wave model) where all the above plus washing machines, bread makers, thyristor controlled equipment are used - then sine wave is required.
To make the choice even simpler we have 6 months exchange / upgrade policy. If you purchase a Pro Combi Q and find there is some equipment that you cannot run due to the Quasi Sine wave and require Pure Sine wave, Sterling are happy to up-grade your quasi-sine unit for Sine wave with the only cost being the difference between the 2 products (unit must be sent direct to Sterling and in good condition). Offer applies dealing direct to the factory only.

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