The first practical application of solar photovoltaic’s was to power orbiting satellites and other spacecraft, but today solar photovoltaic systems are becoming far more main-stream and can be used for any number of exciting applications. While traditionally most systems were grid-connected whereby excess electricity was fed onto the national grid, off-grid or hybrid systems are becoming more popular.
There are many reasons for this on the most basic level off-grid battery storage systems allow communities where there is no grid to have access to electricity. There has also been a trend in the developed world towards on-site storage. Electricity prices are increasing to such an extent that in many cases electricity generated by PV panels and stored on site is cheaper than the electricity that you can buy from the grid.
Many of the grids are in need of upgrading and therefore unable to deal with demand, as a result, we are facing the real threat of grid black-outs in the not too distant future.