Frequently Asked Questions
Government offers to pay a tariff for purchase of the solar power generated by the solar plants
For Solar Rooftop, approximately 100Sqft of shade free area is needed for 1kVA Solar modules
Yes, this back-up can run the household loads during a power-cut as usual. This system will work independently of the solar system.
On-grid systems without batteries can be considered for the following purposes:
- To neutralize the electricity bill and generate free, clean energy for oneself.
- To hedge against the increase in prices of electricity tariff
· To generate some income over a long period of time. Yes, the solar plant is an asset that generates revenue throughout its lifetime. On-grid system without batteries shouldn’t be considered at places where the power outages are quite high especially during day time. This system is not recommended for places where the reliability of power is the first choice
Solar power generated during power outages can be stored in batteries. These systems are called hybrid systems as they have battery storage facility as well as grid connection.
The reason behind this logic is that during a power cut, in case electricity personals are working on the grid lines, export of solar power can cause electric shock to the people working on it. So this is more of a safety issue that solar generation stops.
The solar generation is stopped when there is a power-cut from the grid. The solar inverters have the inbuilt property called anti-islanding which makes sure that the moment there is a power outage at the grid, it will stop the solar generation.
Depending on the state level policy prevailing in your state for roof-top solar, the requirements for putting up a solar power plant can vary. In general, these are the few basic requirements for applying for a roof-top solar system:
- You should be the owner of the building where you intend to put solar.
· You should be the consumer of the local ESCOM(Energy Supply COMpany), the energy meter should be in your name.
Grid connection can eliminate the requirement of batteries in a solar roof-top system which can give a longer life for the system without replacement of its parts. Apart from this the following benefits are also there compared to an off-grid battery based system:
- Lower system cost as lower accessories are required.
· The inverter efficiencies are better in a battery-less system which reduces the energy losses.
Depending on the state level policy, there are two different options for going grid connected/on-grid/hybrid:
- Net metering: The metering system where the power generated is first consumed by the loads in the building. Only excess is exported to the grid. In net metering, the bill is calculated as a difference of total export & total import
- Gross Metering: The metering system where the whole power is exported to the grid. Generally in gross metering output of a solar inverter is directly connected to the grid and not to the loads first.
For example, in Karnataka, for residential buildings, the choice for grid connection is through net metering
An On-Grid inverter performs the following major functions:
- Convert the DC Power from solar panels to AC Power.
- Synchronize this AC power with the voltage & frequency of the grid power.
- Maximize the output from the solar panels(via a feature called MPPT).
Loads are nothing but the energy consuming electrical appliances. Light, fan, refrigerator, motor are some of the examples.
The Solar On-Grid PV System is connected to the grid via the Solar inverter. In terms of physical connection, the solar inverter (or grid-tied inverter/On-grid inverter) is connected to the distribution board of a building just like how a bad (equipment) point is connected.
The grid is electricity connection that a building has. In general, grid refers to the ESCOM (Energy Supply COMpany)