Frequently Asked Questions
A solar system converts sunlight in to electricity. The generated current from a solar panel is DC [direct current]. To convert the DC into AC [alternative current] which is in the form of national electricity grid, an inverter is used. Inverter is the device that will match the properties of the national grid and connect the solar system with the grid.
Solar panels will generate energy in the day time when the sun is falling on to it. The inverter will convert it to usable alternative current [AC] and connect it to the home main power supply. The generated power from the solar system will be first utilized, if there is any in house usage and the excess power will be fed into the national grid.
As the name implies, the solar system is tied with or attached with the national electricity grid, so it is known as a solar grid tied system.
At day time the excess power will be fed into the grid after utilized in house and at the night time the power will be taken from the grid.
To calculate the energy inflow and outflow a special meter has to be installed from the electricity supplier known as “net meter”.
“Net metering” is the concept of giving credits to the solar system owners, for the energy units that they have given to the grid. So the solar grid tied system is also known as solar net metering system.
The required capacity of the solar system is determined by the amount of power that you wish to generate. You can decide to install a solar system to offset the total no of units or a portion of it depending on the availability of the investment and the space.
After the installation of net meter the utility service provider will provide you with a new bill as follows;
No. It does not consist of a battery bank to store energy.
No. The solar grid tied system cannot operate independently without the support of national grid. The solar system will shut down in the failure of the national grid supply.
Once you install a solar grid tied system you have to apply for a special meter that can measure both the export [how many units from the solar system have been transmitted to the grid] & the import [how many units have been used from the national grid] of energy.
As the concept is known as “net metering” the special meter that is used to calculate the energy inflow & outflow is known as the “net meter”.
In Sri Lanka the net meter has to be obtained from the CEB [Ceylon Electricity Board] or LECO [Lanka Electricity Company] depending on the service provider in your area.