Solar Pv Systems

  • There are basically two types of solar PV systems: stand alone (off-grid) and grid connected (On-grid).
  • Stand-alone solar PV systems work with batteries. The solar energy is stored in the battery and used to feed building loads after conversion from DC to AC power with a stand-alone inverter. These systems are generally used in remote areas without grid supply or with unreliable grid supply. The disadvantage of these systems is that the batteries require replacement once in every 3 – 5 years.
  • Grid-connected solar PV systems feed solar energy directly into the building loads without battery storage. Surplus energy, if any, is exported to the DISCOM grid and shortfall, if any, is imported from the grid.
  • The grid tied Solar Power Plants without battery may be installed for any office buildings. As the office buildings have day time energy consumption, Solar System without battery is suggested, as the battery is the weak link in the system and requires regular maintenance as well as replacement in every 3-5 years. Also the efficiency of the battery based system is less due to loss in the battery (around 15%).
  • Solar net metering: In net metering the solar energy exported to the grid is deducted from the energy imported from the grid subject to certain conditions. The consumer pays for the net energy imported from the grid. To enable net metering DISCOM will replace the existing service connection meter with a bidirectional meter that displays the import and export energy separately.

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