On Grid Solar System

What is Solar On Grid ?

The On grid solar system is connected with a utility grid and this system would work only if the grid is available. In case of a power cut, the system will not work and hence the On-grid system is also termed a Grid-tied system. A grid is required since the inverter needs to be provided a reference voltage and the inverter needs to sync with the grid in order to export energy back into the grid.

How it works ?

The On grid solar system is connected with a utility grid and this system would work only if the grid is available. In case of a power cut, the system will not work and hence the On-grid system is also termed a Grid-tied system. A grid is required since the inverter needs to be provided a reference voltage and the inverter needs to sync with the grid in order to export energy back into the grid.

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Types of Solar On Grid Systems

Solar technology in the rooftop sector has improved drastically over the past few years and has catered to the growing demands of the discerning public. There are many types of rooftops and each one of them has varying conditions like different roofs, different orientations, shadow issues, etc. Within on-grid solar PV systems, there are mainly three different types of systems:

String Inverter

Micro Inverter

Power Optimizers

In this system, a string inverter is connected to a set of panels that are in series. These inverters collect the accumulated DC power and convert the DC power into grid supportive AC power. Even though these inverters don’t have a number of components for failure, generation depends on the least generating module in the series. Due to shadow issues or low performing module, the generation of the entire array gets affected. This system best suits on the roofs where there are no shading issues due to trees, adjacent buildings etc.

Advantages of string inverter system are

Ideal for both residential and commercial if no shading issues are present.
Most cost effective system
Can be paired with power optimizers

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An alternative solution for string inverters is Micro inverters. In these systems, each module is connected to an inverter which is mounted just below the panel. Since each panel has one inverter, each panel will generate power independent of the other. This kind of system best suits in a place where there are shadow issues on one or more modules, roof with different directions etc. In this kind of system, module level monitoring is possible and it helps in easy maintenance of the system. One module or one inverter failure wouldn’t affect the generation of rest of the system.

Advantages of Microinverter system are

Panels can be built in any configuration or orientation, and micro-inverter systems can be as small or as large as you need them to be.
Micro-inverters isolate the output of each individual panel and enable panel-level monitoring.
You have the ability to start with a small-scale system that matches your budget, then expand down the road.

Power optimizers, though they offer the same solution as what is offered by micro inverters, are a little different in technology aspect. In these systems, each module is connected with one power optimizers or a pair of panels are connected to one optimizer. These optimizers start tracking MPP at lower voltages and help in generation of power even in low light and intense shadow conditions as well. Each of these optimizers sends the DC output to the string inverter at the end, after optimizing the output of each module individually. With these optimizers, more electronic parts are not allowed on the rooftop. Optimizers can be configured in such a way that one optimizer can be connected to one module or two modules decreasing the cost of the over all system.

Advantages of power optimizer based systems are

You can build your array in a partially shaded area or split strings across the usable space on your roof. Optimizers ensure you get the most production out of each panel in your system.
Optimizers give you individual panel monitoring. You’ll be able to track the production from each individual panel, which can help you spot defects and shading issues on a panel-by-panel basis.
More flexibility to design