What are the various classification of activities pertaining to Operation and Maintenance (O&M) of rooftop solar plant?

The various activities related to operation and maintenance of rooftop solar plant can be classified as below: Preventative maintenance: It comprises of routine inspection and servicing of equipment with a specific task periodicity of all key components. This is done ?to prevent breakdowns and unnecessary production losses. Preventive maintenance is carried out in a manner to maintain the component warranties in place. The O&M contract includes scope of services under preventive maintenance and each task periodicity. Corrective maintenance:  It covers the activities to be performed to restore component/s to a status where it can perform the required function. The corrective maintenance takes place after a failure detection either by remote monitoring and supervision or during regular inspections and specific measurement activities. Usually the contractor is obliged to comply with certain response times when there is a need of corrective maintenance. Condition-based maintenance: Condition-based maintenance implicates monitoring of equipment condition and plant operations on a real-time basis and addresses a potential problem at a very early stage to prevent downtime. This approach uses periodic measurements to detect evidence that equipment is deteriorating, with the aim of extending service life by avoiding impending problems.

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Where should the inverter be placed in grid connected solar power system?

The Inverter used in the PV solar system is either to be mounted on the wall or placed on the rooftop depending upon the site features and space availability. Following points should be considered while placing the inverters: Inverters should be easily accessible Away from direct sunlight In an area with at least ½ foot free space on all sides of it

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What is an Operation & Maintenance contract?

An Operation & Maintenance contract establishes a contractual relationship between the plant owner, and the contractor of the project. It performs an essential role in the operations phase of the plant, and has a significant impact on the projects’ long-term success. Accordingly, it is a key document from the point of view of both, the Owner and the Contractor. A well drafted operation & maintenance contract can, not only bring transparency in responsibilities & activities, but also ensures in maximizing the energy generation from the plant and enabling it to function smoothly.

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Why Operation & Maintenance of Rooftop Solar Plant is required?

Rooftop solar plants are not maintenance free, they require a regimen of continual monitoring, periodic inspection,  preventive maintenance, corrective maintenance and service calls. These actions are required to enhance up-time, performance, economic viability, address unplanned outages & repair etc. Operation & Maintenance of a rooftop solar plant is essential to maximize both energy yield and the plant’s useful life. Rooftop Solar Plants lifetime are expected to be 25 years or more, so safe and proper maintenance is an integral part of successful and reliable operation.

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Consumer Dashboard

Dashboard for consumers can be accessed from the ‘Consumer Check Status’ button from the top menu bar on the Home Page (www.solarrooftop.gov.in/goa/). Consumer enters the Mobile number and receives OTP (One time Password), to login in the respect dashboard. On login in, the dashboard displays the details of the consumer along with the application progress status. The status includes the stage of the application, the start date and the date on which that particular stage is successfully completed. Consumer can also view the related documents

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How can I check whether my rooftop solar plant is operational?

You can check whether your solar plant is operational or not by following options: The inverter has indication lights which shows the status of operation (One can refer the inverter manual to understand the signals from indication lights)  and via display panel of the inverter or remote monitoring a person can check the generation from the plant. Learn more about how to view instantaneous generation of my solar rooftop plant: http://139.59.61.50/2018/08/10/where-can-i-view-instantaneous-generation-of-my-solar-rooftop-plant/ By reading the value from Solar Meter which records the no. of units generated by your plant.

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What is clipping in inverters?

The DC to AC ratio (also known as the Inverter Load Ratio) is an important parameter when designing a solar project. The key driver here is the “clipping loss”. When the DC power feeding an inverter is more than the inverter’s capacity to, the resulting power is “clipped” and lost. Adding 20% extra panel capacity to your inverter is a wise choice: The main reason to oversize an inverter is to drive it to its full capacity more often. As PV modules do not consistently perform at their nominal output rating. The module output power is affected by the weather, the sun’s position during the day/different seasons, local site conditions and array orientation. In addition, module output power may decrease due to aging, soiling and shade. Oversizing the inverter is typically not a requirement, however an experienced PV system designer may choose to oversize the inverter in order to maximize the power production Secondly, additional loading of inverters offers reduction in overall cost of the system. However, in some countries, the local authorities prohibits inverter oversizing. In this case, one has to always follow the local regulations. [Source: Youtube] [Publisher: SolarQuotes]

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What is the loading ratio of inverters?

Loading Ratio or DC to AC ratio of an inverter is the ratio of Rated Array Power (DC kWp) to Rated Inverter Output (AC VA). This can be expressed as a percentage value. For example, if array output of 55kWp DC were connected to a 50kW inverter, the Loading Ratio would be: (55kWp / 50kW) x 100= 110%. One can find the Rated Array Power (DC kWp) & Rated Inverter Output (AC VA) of an inverter on the datasheet provided by the inverter manufacturer.

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Where can I view instantaneous generation of my solar rooftop plant?

Generation of the system can simply be viewed on the display unit of the inverter or through local & remote monitoring which can be performed by most common connection techniques like RS232 for local monitoring, RS485 and powerline for inverter interconnection. For wireless connection Bluetooth, GSM & Wi-Fi are most common used. An inverter measures parameters like: Immediate DC voltage and current readings from the PV array  Immediate AC voltage and frequency readings  Output power (W)  Lifetime energy produced  Switch-on/off time for the day  Up-time & Down-time for the day  Cumulative hours of operation (h) 

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What is the difference between a normal inverter and grid connected inverter?

Normal inverter A normal inverter system or a UPS basically have batteries to store energy from the grid when the supply is available. When the power is cut off, the inverter takes the DC power from the batteries and converts it into AC used by the appliances. There is an automatic control in the system that intellects if the grid is not supplying power and switches the UPS or inverter into battery mode. Grid connected inverter A grid tied solar inverter, also converts DC power (produced from Solar Panel) to AC. But additionally they have built-in MPPT (Maximum Power Point Tracking) feature. As the voltage produced by Solar Panel varies depending on the temperature and obtainability of sun, MPPT allows solar inverters to draw maximum power from the solar panels. The solar inverter used for grid-connected system also comprises an anti-islanding functionality which basically means that the inverter is designed to shut down if the grid goes down, so that you won’t be inadvertently energizing the grid if a someone is working on it

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