Types of rooftop solar system

Before you decide to invest in rooftop solar project, it’s important to know which type of rooftop solar system will work for you, which are the top solar PV manufacturers in India . Each solar system has its own benefits and limitations, and it is very important to gain a real understanding of these before you invest in a potentially expensive solar PV system.

Types of rooftop solar system

Based on the type rooftop can be categorized in 3 types:

 On-Grid Rooftop Systems

On-grid model consist of grid connected rooftop system which is connected to the grid and feed the surplus electricity to grid. Extra electricity is sold to electrical company through the net metering. Subsequently when consumer imports power from grid, the banked electricity is adjusted, leads to help electricity bills down. This is the most economically viable system as there is no requirement to install a battery bank.
Advantages:
1. These system do not coupled with the battery bank, Which bring down the cost.
2. No battery bank required, so low maintenance cost.
3. Savings from the system lead to a payback period of up to 5 years. After that, you get free power for 15 more years.
Disadvantages
1. Not suitable for areas with poor grid connectivity or have irregular power supply.

Off grid systemOff-grid Rooftop Systems

Off-grid PV systems are isolated from the distribution grid, and usually use stand-alone inverters with batteries. It stores electricity generated through PV in battery bank. These rooftop systems have a huge application in rural, remote and sub-urban areas which have limited access to electricity.
Advantages
1. Main advantage of system is that they can even supply electricity if weather is not sunny outside.
2. Off-grid systems more suitable to areas where power supply is irregular.
Disadvantages
1. Battery bank increase the initial set up and running cost as well.

Hybrid solar systemHybrid rooftop system

Hybrid rooftop system combines the benefits of both on-grid  system and off-grid system. System is connected to the grid and battery bank.  It is the most useful type of system for houses, bunglows, nursing homes and other smaller establishments. Hybrid system stores energy to battery bank and send extra electricity to the grid if battery bank is full and there is no sufficient load.
It allows for the system to provide 6-7 hours of backup for part of the load during power cuts while still delivering the benefits of a grid-tied system.
Savings from the system lead to a payback period of up to 7 years. After that you get free power for 13 more years.

4 Comments

  • Vikram

    Last yr i hv single battery inverter on which i used a 12v 300watt solar panel bt this year i change the inverter it is of 2 battery . So i want to know that which type of solar panel is good to use 24volt in parallel ya 2 panel of 12 volt in series which one gives best efficiency

    • Hi VIkram,
      You already have a 12 volt solar panel, So you need to buy another 12 volt panel with same capacity ie 300W. Connect them in series to charge 24 volt battery bank.
      The thumb rule to add the voltage is: Add panels in series.
      The thumb rule to add the current is: Add panels in parallel.

      Note: A 24 volt panel will not work with existing 12 volt panel in any type of combination.

    • Offcourse, You can use your existing inverter. You need to buy a charge controller for your solar panels.
      Please make sure to check the ampere and voltage ratings of charge controller.

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