These Pro Combi S 1500W are a Pure Sinewave module inside a Pro Combi Q (modified sine) casing and a Pro Combi Q box. So they are a Combi S in terms of performance but they look like a Combi Q. The Combis are retailed only by Sterling. You can only get these Combis at this price through us directly. They have 30 DAYS WARRANTY ONLY

 Instruction Manual PDF

Product Information PDF

 

Dimensions 3500W


Dimensions 1600W & 2500W

 

These Pro Combi S 1500W are a Pure Sinewave module inside a Pro Combi Q (modified sine) casing and a Pro Combi Q box. So they are a Combi S in terms of performance but they look like a Combi Q. The Combis are retailed only by Sterling. You can only get these Combis at this price through us directly. They have 30 DAYS WARRANTY ONLY

 

 1500W 12VDC and 230V AC pure sine wave / 60A charger / 30A 20ms crossover switch

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

 

General Specifications

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 - 40A, 2500 - 55A

1600 - 40A, 2500 - 55A

Output Current 24V Model:

1600 - 20A, 2500 - 25A

1600 - 20A, 2500 - 25A

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.

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