An off-grid photovoltaic (PV) solution is a power supply system which is not connected to the main network. These systems can serve multiple users, which are referred to as mini-grid, or single use. Electricity generated by the off-grid system is directly consumed and is not fed into the main electricity grid. Off-grid systems comprise a battery backup which stores energy for use when the sun is not shining and the PV generator is not producing.
Off-grid systems can also integrate various sources of energy in order to provide a more reliable energy supply. For instance a PV generator can be combined with a wind generator to offer a complete solution. Often, in off-grid locations where diesel generators are still commonly used, a PV system can work in combination with a diesel generator set, with the latter providing backup power on occasions where renewable sources dips. Such systems are called hybrid systems.
Off-grid solutions are perfect for areas without direct access to the public electricity grid. Often, costs to expand the public grid at a particular site are uneconomical and constrained by limited infrastructure. An off-grid system is a much simpler and more affordable solution to generate electricity. Off-grid PV solutions are ideal for rural electrification, especially in developing countries and remote locations.
Benefits
- Reduce cost for operations and maintenance of generator set and fuel
- Reduce diesel consumption leading to a cleaner and healthier environment
- Provide water, pumping and purification to rural areas thus lowering illness which can be a result of poor water quality
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