The most popular hybrid choice is that of solar and wind. It's generally windy to some degree during overcast days, which makes wind towers and turbines effective when the sun isn't shining. The wind collectors will also work at night, providing there's wind. Alone, the solar and wind systems both have flaws; solar can't work without sun, and wind can't work without wind. When the two systems are combined, they fairly well cover each others' weaknesses.
Hybrid systems work for both off-grid solutions (such as using propane generators to charge batteries when the sky is overcast) and for grid-tie systems (using wind turbines to supplement the electricity you produce during in climate weather).
Both the solar and wind resources available in the boundary layer vary in time and space. Data indicate, however, that the availability of the two resources may complement each other on both short and long term bases in many regions to meet different load requirements in various applications. This suggests that solar-wind hybrid systems may be more attractive and suitable to meet specific power demands and/or to avoid expensive storage systems (or expansion of conventional systems) than wind or solar energy extracting systems alone. To investigate the feasibility of operation of hybrid wind-solar systems at a particular site requires detailed and simultaneously acquired information on solar and wind energy availability on time scales from minutes to hours over a period of at least a year. Such data sets are rare and even then they are seldom found to be representative.
The general cost of this system is about Rs. 3.75 Lacs to Rs. 4.00 Lacs per KWA.
Work at Shivaji Park, Dadar, Mumbai 400028