Solar Based Inverter AC (Air Conditioners)
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Solar AC Price in Pakistan: Everything about Inverter AC & Solar Air Conditioners

By September 1, 2016 29 Comments
inverter ac

Using the latest advancements in Inverter technology, air conditioners are quieter to run and more economical to operate than conventional Air Conditioning units. Let’s learn what this Inverter technology Air Conditioning all about and the operating principle of these newer Inverter AC air conditioners:

There are four parts of a cooling/refrigeration system and all air conditioners essentially go through the cycle of compression, condensation, expansion, and evaporation in a closed circuit. The compression phase involves a compressor device which makes use of an electric motor to compress the refrigerant coolent. Today hermetically sealed reciprocating compressor is widely used for the refrigeration and air conditioning applications. This type of compressor can use a drive to control the compressor motor speed to modulate cooling capacity.

A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, microdrive, and popularly here in this application called as an Inverter. Since Inverter is a device which converts Direct Current (DC) input into Alternating Current (AC) output, it is referred to as DC Inverter (to remove any ambiguity because a DC-DC converter is commonly confused with DC-AC Inverter). A DC Inverter Air Conditioner has a compressor which is VFD or Inverter controlled (as descibed above) and the whole package is commonly called as Inverter Air Conditioner or DC Inverter Air Conditioner.

So, the basic operating principle of an Inverter is pretty straightforward as it is comparable to the technology used in cars, where you need to press the throttle harder to go faster. Compressor speed (as an analogy say the engine running and its pistons creating the torque) effects the performance output (speed of the car). The Frequency (throttle controlled by VFD) is directly related to the motor’s RPM’s and hence cooling or heating performance (car’s speed). In other words, the faster the frequency, the faster the RPMs go. If an application does not require an electric motor to run at full speed, the VFD can be used to ramp down the frequency and voltage to meet the requirements of the electric motor’s load. As the application’s motor speed requirements change, the VFD can simply turn up or down the motor speed to meet the speed requirement.

In a more convenient and technical way, an Air Conditioner described as using “Inverter technology” or “Inverter equipped” has the ability to continuously control its thermal transfer rate by modifying the compressor’s speed in response to the demand for cooling . Variable Refrigerant Flow (VRF) phenomena is typically adopted with an Inverter equipped Air Conditioner which adds a VFD and Control Circuitry alongside the compressor in order to support variable motor speed and thus variable refrigerant flow helps regulate the conditioned-space temperature.


By contrast, traditional air conditioners regulate temperature by utilizing a compressor that is periodically either working at maximum capacity or switched off entirely. Fixed speed compressors start or stop automatically in order to sustain the desired temperature, but an inverter unit regulates regulates the capacity of the compressor instead. Frequent on/off switching of the compressor means high initial torques for the compressor to start running and hence more surge of currents during transient times, hence increase in electricity bills.

So much so, the thermodynamic cycle is explained with this image:

Basic principle of Air Conditioning and Refrigeration

Note that the four-part heat exchange cycle is divided at the center into a high side and a low side. The same refrigerant is used to move the heat from one area, to cool this area, and to expel this heat in another area. Gases give off heat when changed from gas to liquid.

  • The refrigerant comes into the compressor as a low-pressure gas, it is compressed and then moves out of the compressor as a high-pressure gas.
  • The gas then flows to the condenser. Here the gas condenses to a liquid, and gives off its heat to the outside air.
  • The liquid then moves to the expansion valve under high pressure. This valve restricts the flow of the fluid, and lowers its pressure as it leaves the expansion valve.
  • The low-pressure liquid then moves to the evaporator, where heat from the inside air is absorbed and changes it from a liquid to a gas.
  • As a hot low-pressure gas, the refrigerant moves to the compressor where the entire cycle is repeated.

We will get to solar ac price list but first learn about microcontroller:

A microcontroller can sample each ambient air temperature and adjust accordingly the speed of the compressor. The alternating current is used to drive an induction motor since the speed of an induction motor is proportional to the frequency of the AC, the compressor can now run at different speeds with the use of VFD.

Advantages:

The inverter air conditioning units have increased efficiency in contraction to traditional air conditioners, extended life of their parts and the sharp fluctuations in the load are eliminated. This makes the Inverter AC units quieter, with lower operating cost and with less broke downs. The Inverter AC units might be more expensive than the constant speed air conditioners, but this is balanced by lower energy bills. The payback time is approximately two years depending on the usage. The additional electronics and system hardware adds cost to the equipment installation but can result in substantial savings in operating costs. Eliminating stop-start cycles increases efficiency.

Generally, VFDs allow you to match the speed of the motor-driven equipment to the load requirement. Electric motor systems are responsible for more than 65% of the power consumption in industry today. Optimizing motor control systems by installing or upgrading to VFDs can reduce energy consumption in your facility by as much as 70%. Additionally, the utilization of VFDs improves product quality, and reduces production costs. Combining energy efficiency tax incentives, and utility rebates, returns on investment for VFD installations can be as little as 6 months.

By operating at varying speeds, VRF units work only at the needed rate allowing for substantial energy savings at partial-load conditions. Heat recovery VRF technology allows individual indoor units to heat or cool as required, while the compressor load benefits from the internal heat recovery. Energy savings of up to 55% are predicted over comparable unitary equipment. This also results in greater control of the building’s interior temperature by the building’s occupants.

Conclusion:

The fixed speed compressor in a standard air conditioner runs at 100% capacity when it is started, but an inverter unit starts at a low level and then progressively enhances its capacity, depending on the requirement to heat up the room or cool it down. DC inverter air conditioners make use of a variable frequency drive to regulate the motor’s speed, thereby controlling the speed of compressor too. Frequency acts as the the input variable to control the compressor speed. The current ambient air temperature is sampled by using a microcontroller and the compressor’s speed is adjusted appropriately.

Glossary:

Rectification is the conversion of alternating current (AC) to direct current (DC)

Pulse Width Modulation is a technique to control power applications, since analog systems such as linear power supplies undergo large heat dissipation (Energy Loss) and digital signals represented in case of PWM are fairly easy to convert back to analog with a minimum of hardware.

Variable Frequency Drive includes a rectifier that converts the incoming Alternating Current (AC) to Direct Current (DC). It then utilizes Pulse Width Modulation (PWM) of the DC in the inverter to generate AC of desired frequency.

Capacity modulation is a way to match cooling capacity to cooling demand to application requirements.

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29 Comments

  • Iqbal Hussain says:

    ok this is good thing but please clear what price of 1.5 ton ac/dc with complete package of solar panel, batries etc.

  • Anonymous says:

    solar system package for 200 square yards house with 3 bedrooms, without Air conditioner what cost

  • Imran says:

    Hi i am M. Imran i want to buy the 100% solar ac without using Lesco electricity. If u have plz send me detail.

  • Yusuf says:

    Thank you for the detailed article on Inverter AC’s. They seem a logical choice. However, what I have heard is that if they break down, the repair is pretty expensive compared to the regular AC’s. Also they do seem to breakdown earlier than the normal ones. Can you share your opinion?
    Regards

    • Zorays Khalid says:

      Dear Mr. Yusuf,

      Let us share with you some stats:

      From month March to April, one renowned AC manufacturing and assembling brand (GREE) manufactured 25,000 air conditioning units per day meeting their demand and supply with zero inventory concept.

      It is usually the case that the installers who have their interests with a particular brand or technology would spread heresay kind of information; not logical otherwise.

      To your comfort (and of most of our clients), many of the brands available are providing at least 3 years warranties (that you already have a premium price for) and 1 year parts warranty upon fault till replacement. One such brand is Changhong Ruba. We can quote many others.

      Sunny Regards

  • Javed Ahmed Shaikh says:

    Would you please define, How much amount is needed for 1.5 tons Solar AC including solar panels with complete installation but without batteries..??

    • Zorays Khalid says:

      Dear Mr. Javed Ahmed Shaikh,

      Such a system is possible only through our on-grid net metering system. The cost of disseminating 1.5 tonne equivalent units back to the grid to waive off its electric consumption bill grosses to somewhere around Rs. 575,000/-

      Thank You for your excellent question.

  • Anonymous says:

    hi this is khaliq mahmood can i.get the price of 1.5 tonne split ac with pannels and instaletions coast thanx

  • Dear sir if I buy kenwood Ac 1.5ton inverter with solar panel .so how much amount is required for this complete system with installation

    • Zorays Khalid says:

      We supply you with the Kenwood AC (RnI Group) plus the complete solar system. The cost is dependant on hours of operation. For 10 continuous hours: ~Rs. 440,000/-

  • Niaz Muhammad says:

    Sir I want 1 ton AC with complete infrastructure ie (solar panel, battery & etc) please tell me total amount .Thanks

  • Anonymous says:

    what is the price of Solar split AC?

  • Faheem says:

    Hi
    Can you give me a price for a solar powered air conditioner to power one room please
    Thanks

    • Zorays Khalid says:

      Our complete 1 Ton AC sun trackable package without Air Conditioner is Rs. 350,000/- only.
      Our complete 1 Ton AC sun fixed mounted package with Air Conditioner is Rs. 350,000/- only.

  • Muhammad Imran says:

    Salam! I want to buy one ton Solar Air Conditioner for a small room. How much it will cost with complete equipment i.e Panels and Batteries and how much power solar is needed for it.
    Thanks

  • Waqas says:

    Hello
    I would like to ask , if i wants 3 , 1 ton air cond with full solar installation
    What will be the charges
    Thank you

  • Asad Shah says:

    1 *1.5 ton ac of gree or samsung price with full installition and battery plus every compulsary items price plz in jamshoro/hyderabad

  • AIS says:

    Hi,
    I have already installed a Gree Inverter AC. How much solar system will cost which can run that AC during day time only i.e. dont need battery backup.

    • Zorays Khalid says:

      Rs. 276,373/-

      Includes

        8 X 250W Poly – Crystalline Solar Panel (Trina Solar or Equivalent Tier I Product), Class A, Hi-Quality with maximum efficiency nearing 17.1% in Spot Test, TUV & ISO Certified
        5 kW Pure Sine Wave Solar On Grid Inverter with WiFi controllability (Customised OEM from Voltronic Power for Net Metering) 3 Phase with best synchronization with Generators and wide grid fluctuations
        GI Steel Structure to withstand 140 km/Hr thunder storm/wind storm with Stainless Steel Nuts and Bolts
        Conduits, Circuit Breakers (Schneider/ABB), Changeover, Glands, Lugs, Crocodile Clips, Switch board, DB
        Thermally Insulated Heat Resistant Fire Resistant DC Cables for PV, Inverter Interconnection (Siemens Brand or Equivalent)
        Installation plus Synchronization Charges (Interconnection on bus bar) and Earthing

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