What are the recent trends in Smart Solar Inverter Technology


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Mr.Amit Gupta, Business Head- EISBG, Delta Electronics India Pvt Ltd

Due to the high penetration level of DER (Distributed Energy Resources) the grid is posing great amount of complex challenges on functioning of inverters. As a solution for these common problems the smart inverters come into play by solving most of the problems of the traditional system. Since smart inverters work autonomously, they have a positive impact on the implemented residential sector as well as the national power grid. The traditional grid requires constant maintenance due to the stress, but smart inverters could help to address these localized challenges and growth the flexibility of the system. Smart inverters let two-way communication with utility control centers. In addition, advanced capabilities such as voltage and frequency sensors allow smart inverters to detect grid abnormalities and send the feedback to utility operators.


Delta’s smart solar inverter solutions enables the smart and cost-effective designs for industrial and small utility-scale PV power plants by maximizing energy yields even in challenging landscapes and locations. The smart Inverter will have more DC overloading options, flexible MPPT channels, fuse-less or in-line fuse options, wireless communication systems, mobile friendly APPs etc. With the mentioned features systems will have reduced clipping losses and provide extra generation (kWh) than the conventional PCUs.


Some of the key feature of Delta smart solar Inverters are,

  • Built-in String/Zone monitoring option with SCADA and Mobile communications through wired/wireless network
  • GPRS/Ethernet/direct communication options
  • Built-in Auxiliary Power supply and DC UPS systems with battery for Inverter operations ( in central inverter range)
  • Insulation Monitoring device with digital measurement of insulation value
  • Ground Fault detector and Indicator with adjustable pre-warning alarm and trip level + Negative Grounding Fuse protection
  • IV Curve monitoring at string level for individual DC inputs
  • Delta developed  Highly reliable and stable Sub1G wireless communications systems with coverage area of 100+ meters

By implementing right product with right design options customer can have better performance in system efficiency and earns better yield.

The necessity of the smart solar inverter has been increasing day by day. SMART inverter technology provides some advantages to residential, commercial and utility-scale solar. This includes high redundancy through a distributed AC architecture that reduces system cost and improves operations and maintenance aspects.

The stability of the transmission system can be maintained and strengthened through the active contributions of DELTA smart inverters. Grid operators across the globe benefit from new technologies such as the ability to supply reactive power both night and day, intelligent and flexible PV plant regulation with the Power Plant Controller, and communication interfaces integrated into the inverter Delta smart inverters have proven as perfect choice for Grid management services like dynamic reactive power feed  & Output power throttling capabilities and compliance to complex HVRT, LVRT requirements of large scale PV plants.

The shade-tolerant solution for string inverters lies within the string inverter’s MPPT tracking algorithm which requires scanning of IV curve quite frequently in a short period of time. The MPPT algorithm must take into account the entire MPPT voltage window to act on the presence of a global maximum. DELTA’s shade tolerant Hill Climbing MPPT algorithm technology allows for tracking of dynamically changing global power peaks with no significant decrease in traditional static and dynamic tracking result in maximum efficiency in turn maximize output power generation..  , DELTA’s smart IV curve diagnosis technology  allows the inverter to export IV curves, deploys algorithms on the management system, and analyzes data. It also identifies modes to scan all PV strings of a PV plant and identify hidden PV module faults. DELTA’s Smart I-V Curve Diagnosis is able to carry out online I-V curve analysis on entire strings with advanced diagnosis algorithm. The scanning helps to find out and identify the strings with low performance or faults, which enables proactive maintenance which results in  higher O&M efficiency and lower operation cost.

SUNSPEC & MODBUS are  the industry standard communication protocols designed to achieve interoperability between Distributed Energy Resource (DER) components and smart grid applications. Alongside Wired based MODBUS & SUNSPEC protocols, Wi-Fi based Communication is also available with which users can monitor the solar system working situation through either computer or APP using his smart phone. The User can check today, monthly & total energy harvest along with many more parameters etc.Constantly declining cost of solar modules globally encouraging developers and IPPs to invest more on DC installation to get maximum AC generation. This DC overloading of inverter yields more generation through the day, however increases the duty cycle of the inverter which mandates the inverter to operate at almost rated capacity throughout the day.  DELTA’s SMART inverters with their robust design offer maximum flexibility for project-specific oversizing. Thus, the inverter’s full load hours can be maximized throughout the total project duration—without any component degradation.

With an optimistic beginning, 2020 seems more promising. Hopefully there will be adequate Government support and faster implementation of government policies to help industry achieve ambitious goal of 175GW Renewable Energy by 2022.

To meet the green energy commitments, India is on right track and adding more and more renewable energy (Wind and Solar).  Due to increase RE penetration grid is becoming more and more volatile and unstable. So solar inverter are required to act more smartly and contribute to grid stability. Apart from this, to make the grid more stable, storage is being added. Hence the environment at which solar inverters operate is become more and more complex.  Considering these complexities, there is great need for inverters to be more smart I,e smart inverters. Solar has already become attractive energy source compared to any other sources of Power generation on account of lowest cost of generation. Delta is well placed to meet the market needs with its current range and expected launches in coming quarters.

Certification and qualification of inverters to meet stringent grid codes is a challenge. Though there are IEC/IEEE standards on for the inverters behavior under complex situations like LVRT/HVRT/Frequency control etc. there are not enough facilities for testing and certification to ensure whether the so called smart inverters are really “smart” or not.  Absence of such checks will result in to deep penetration of cheap quality inverters in to the market which puts a cost pressure on the suppliers which meet the requirements in true sense.

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Mr. Idrish Khan, CTO, Ginlong Solis

Ginlong Solis has been committed to technological innovation. From the 4G technology platform to the current 5G technology platform, our products are more abundant and the technology has also made great progress. The Indian market is one of the most active solar markets in the world. For the Indian market, we have also developed and applied many new technologies, such as technology for improving grid harmonics, active surge suppression technology and Class II SPD technology. Intelligent system diagnosis and String level monitoring technology, on Solis cloud platform. The application of these technologies is to better match the Indian power grid, installation environment and system management.

India’s solar market has huge potential, both the government and the public are actively developing clean energy. Aiming at India’s fast-growing industrial and commercial and ground power stations, we will bring new 5G products to the Indian market in 2020, including high-power 400VAC inverters such as 100kW, 110kW, and also 250kW such as 1500Vdc, 800VAC products for large power stations. In addition, we also planned off-grid systems for Industrial and Residential application where have more power cuts, off-grid system is independent power generator to cater such requirement.

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We all now see technology upgradation one of the key things happening in the industry in all the directions, let’s just consider solar plant, PV module technologies is improving and also lot of new method are now adapted BOS, and most important components is solar inverter, which is also called as the heart of the plant. The solar inverter is  the one which provides all information of completely plant,  that only possible technology advancement in solar inverter to turn it into a smart Inverter which all together helps plant operator to know their plant, a smart Inverter can generate alarm, warning, which enable the plant operator to address the fault before it become permanent failure, and at the same time keeping Inverter operation to see if the threshold values are not crossing the limits by that not losing the full generations and allowing to run with best possible power which help to minimize loos of generation. We feel this advance will keep on happening in near future with solar inverter’s, the overall goal is to minimize the downtime, take quick action in terms of O&M Activities, module cleaning, and also prediction of future fault that will help to operate the plant in more efficient manner.

Majorly we see advantage only with smart inverter as Inverter will able to show the very important information just in time whenever it needed or required, by that plant operator can take quick decision just in time to achieve overall goal of minimize down time and avoid loos of generation, which overall impact on revenue generations and also effect the ROI. Another advantage we see is that smart Inverter also safe to operate by a normal person,  there is no threat of human life,  easy to operate, and control, and also easy to carry out Inverter Maintenance, and in case of failure of inverter broken can be replaceable easily with less manpower.

Disadvantages we see is that inverter becoming super sensitive machine, at the same time level of advancement should need to use while commissioning the plant, the best installation practices need to follow, sometimes we see bad installation practise lead to Inverter malfunction as the solar inverter is too sensitive components which get trigger if see any changes in values, so. The important points is not just inverter to be smart also the EPC company, designer, installer also need to use right practice to make all together a better solar plant. As the plant need to function for next 20 to 25 years.

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Mr. Brijesh Prajapati, Managing Director, SOFARSOLAR

Looking to expand its footprint in the Indian PV market, SOFARSOLAR added Hybrid inverter & Storage inverter as a smart solar inverter for SOFAR SOLAR INDIA 2020 renewable future. New versions of Inverters which are very compact in size make SOFARSOLAR differentiate from others. SOFARSOLAR is positioned to play important and leading role in the Indian solar industry with new market technology innovation. New versions of Inverters which are very compact in size make SOFARSOLAR differentiate from others. We are continuous growing company and we have variety of products like NEW ENERGY AUTOMOBILE (Supercharger) products & HYBRID INVERTER, STORAGE INVERTER & ON GRID string inverter developments in our basket. 3kW power storage inverters and 3-6kW hybrid inverters in Single Phase & 10-20kW hybrid inverters in Three Phase, Li-Ion Batteries for Hybrid inverters, AC Retrofitting Single phase 6kW.

SOFARSOLAR HYD inverter can work in auto or Time Of Use (TOU) mode, charge / discharge the battery when needed. In auto mode, the HYD‐ES inverter will charge surplus PV energy into the battery & discharge battery to supply power to local load when PV energy is not enough. 

In case of blackout, HYD ES inverter can work in Emergency Power Supply (EPS) mode. HYD ES inverter will utilize power from PV panels & energy stored in the battery to supply power to critical load. 

Sofarsolar Hybrid inverter is a DC-coupled retrofit battery management system which offers PV plant owners the opportunity to integrate a battery storage solution to their existing installation appeared on the market formally & were widely used in 60+ countries (e.g. Australia, the UK, Germany, Italy, Belgium, Spain, Netherland, France, China etc.), which enable residents’ supply to be secured even in the event of grid failure and decrease the electricity bill. While you have this storage power station and HYD inverter, you may have non-stop energy 24hours.

Compatible with most brands of single phase on-grid inverters and batteries, this series intelligently manages the PV yield of a system allowing generated electricity to be directed within the home, fed into the grid or used to charge battery storage devices. Electricity stored within batteries can be released when domestic loads are high but PV generation is not possible, helping to synchronize energy production and consumption.

You can contact the Sofarsolar sales and service teams who can help you choose the right energy management system, HYD inverter sizes and solar battery sizes which will assist you in cutting down on your energy consumption and will allow you to get good idea of how much battery capacity you need.

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