SUN rays excite the electrons in the silicon cells mounted on the PV panel using the photons of the light, and thus producing a charge called ‘electricity’. The electricity produced is in Direct Current ( DC ) mode. We use electricity in Alternating Current (AC) mode in daily use. An inverter is needed to convert the DC current into AC current. This electricity produced from SOLAR can be connected to our local utility grid or backed up (stored) with batteries to use it at later when SUN Is not shining.
Photovoltaic cells are comprised of a semiconductor material, typically silicon. To activate the movement of the electrons elements of phosphorous and boron are added to the silicon to create conductivity within the cell. The electrons move across the cell when activated by the sunlight’s energy into the electrical circuit hooked up to the SOLAR panel, producing a charge called ‘Electricity’.
SOLAR photovoltaic panels require very little maintenance. Sometime you may wipe off them if too much dust, snow or leaves fell on them.
Solar Panels can be mounted on rooftops or on ground depending on requirement and space availability. SOLAR Power Plants are designed in two types.
- (i) Off-Grid SOLAR System (with storage facility using battery) – when SUN is shining the electricity generated is consumed as per need and rest of the current is used for charging battery that again provide a power back up in absence of SUN. The SOLAR electricity is stored in the battery and can be utilized during night also when the sun is not available.
- (ii) Grid Connected SOLAR Rooftop System – when SUN is shining the electricity generated is consumed as per need and rest of the current is passed on to local electricity. A two-way meter is installed at the site of SOLAR system – the excess electricity passed on to the grid by the roof top SOLAR system is recorded as well as electricity taken in excess from the grid by the consumer when SUN is not shining or Rooftop system’s production is short.
The grid connected system can work on net metering basis wherein the beneficiary pays to the utility on net meter reading basis only. Alternatively two meters can also be installed to measure the export and import of power separately. The mechanism based on gross metering at mutually agreed tariff can also be adopted.