Solar Inverters in Pakistan
Solar inverters are an integral component of the solar system which are considered equally significant as PV plates. The main function of a solar inverter is to convert DC power generated by PV panels into AC electricity which is compatible to home appliances. However, these converters are key to check performance of the solar system. Primarily these PV inverters help in operations like diagnosis and maintenance of the system to fix issues accordingly. In case of extra solar power produced by the panels, these inverters manage batteries for storage of solar charge. In short, these solar inverters influence installer’s decision making to a great deal and efficiency of their solar systems.
How Do Solar Inverters Work
The alternate current (AC) energy is widely used in different sectors to power appliances instead of direct current (DC). In such case, the energy produced by solar panels can’t be utilized until its conversion. Therefore, a solar inverter is attached to the PV system where the solar energy is sent and later on transformed into useful, compatible alternating current (AC). With inverters, it is possible to send back the excessive amount of electricity into the grid and earn electricity units.
It is pertinent to mention here that solar systems are classified into three categories mainly. These include on-grid or grid-tie solar system, off-grid or stand-alone power system (SAPS) and hybrid solar systems. On the same pattern we have grid-tie inverters, off-grid inverters and hybrid inverters.
On-Grid or Grid-tie Inverters
As obvious by its name, a Grid Tie Solar Inverter / On Grid Solar Inverter is always synchronized with a utility line interface. Suitable to be attached with an electric grid, it converts DC power of solar panels into home appliances friendly AC power.
Contrary to the grid-tie inverters, off-grid inverters are not connected to utility line phase. The electric current runs from PV plates to the battery or charge bank and then converted into AC power.
Hybrid inverters also termed as multi mode inverters, are said to be the smart choice owing to their technology and advantages. These inverters intelligently manage power input from battery and from solar PV plates. The batteries are either charged by solar power or electricity grid connection when these inverters are installed to your solar system.
Types of Solar Inverters
Based on technology and structure, solar inverters can be divided into three different types. Each type has been especially designed with different working mechanisms to cater the needs of the respective solar system.
String inverters are the most commonly used inverters globally in a small-scale solar power system. Having high compatibility with the climate of Pakistan, these inverters are widely installed here in domestic sector. For years, string inverters are being integrated to PV systems and not only it is trusted and proven technology but inexpensive as well. Before stating the advantages of string inverters, first we have to see how they work.
- How Do String Inverters Work
In solar energy systems with string inverter installed, all PV panels are connected to wires and arranged into a series or groups called ‘strings’. These multiple strings are attached with a single inverter by wire that is located on side wall, garage or basement. The energy produced by all PV plates in the form of DC electricity is sent to the inverter that converts it into AC electricity.
- Advantages of String Inverters
As string inverters are not installed on the roof, their maintenance is easier for not being exposed to weather effects. These inverters are durable and reliable in performance which result in high competence most of the times. By offering only string level monitoring instead of each panel, they can be accessed remotely to check any issue.
Central inverters are best suited to the needs of commercial and industrial sectors where usually bigger solar systems are in place. Designed for utility scale projects like solar farms, central inverters has working mechanism almost same as string inverters but with a few alterations. On average, the size of central inverters ranges from 100kW up to megawatts. As their resemblance with string inverters has already been mentioned, let’s figure out the key difference and centralized approach used in these inverters.
- How Do Central Inverters Work
In central inverters, the strings are connected in a combiner box or power station instead of directly linked to the inverter. The solar energy produced in DC form is transferred to the power box which moves it to the central inverter and converts into AC power.
- Advantages of Central Inverters
Despite being used for a large scale, the central inverters have an advantage of reducing plenty of inverters to be used otherwise. With fewer component connection and a centralized approach, it is easy for maintenance whenever required. Apart from that, it lowers down the cost per kilowatt in comparison to the conventional string inverters. The reliability of central inverters is high and proven in the field for years.
Micro inverters are relatively new in the market and initially these inverters were quite expensive. But now manufacturers have worked on this point and reduced their prices to make them a viable option for residential solar systems. Nowadays these inverters are also being used in the sector or large scale solar installations.
- How Do Micro Inverters Work
As a module level power electronics, a micro inverter is attached to each solar PV plate included in the system. Either it can be mounted on the back of each panel or can be attached next to it. Each of these panels produces DC with sunlight that is directly converted to AC power on the roof and then it is sent straight to the switch board to use for home appliances. As far as their sizes are concerned, they are usually available in 250W to 1kW range suitable for 1-4 PV modules.
- Advantages of Micro Inverters
As each solar panel is connected to its own micro inverter, the performance output of all panels is optimized individually. This results in panel level monitoring and ensures that if a PV plate is low on performance due to shading, it won’t impact others. With each panel connected to its own inverter, the system size and capacity can be expanded when required.
Top Notch Solar Inverters in Pakistan (Brands)
A number of options are available for solar inverters in the market today. Premier Energy integrates the best ones in terms of performance consistency to the turnkey solar systems offered to our clients. These brands are mentioned below with respect to types of solar system.
Off-Grid Solar Inverters: Infini (off-grid solar inverters), Axpert
Hybrid Solar Inverters: Infini Hybrid Inverters, Goodwe Hybrid Inverters
Solar Inverters Prices in Pakistan
Solar inverters prices in Pakistan vary as per brand, specs and performance capacity. Premier Energy keeps it cost effective for their customers by opting for those inverters which are performance efficient and affordable.