three-phase alternating voltage is controlled by a microcomputer based on DSP technology . The frequency and thus the speed of motor varies with the intensity of sunlight i.e. the speed of motor shall be directly propotional to the intensity of the solar Irradiance. KEVIN Motor Drives are world class unique drive which will reduce the cost of imported drive by 50% and The Drive have all the features which are required for trouble free operation a Solar Photovoltaic Water Pumping System.

A recent development in renewable energy technology is 'grid-interactive or two way grid interconnection. These systems use sophisticated control equipment so that when your renewable energy system produces more power than you need, the excess power is fed back into the grid. When your system doesn't produce enough power, then you get power from the grid. Some electricity retailers offer 'net billing' arrangements, so that they buy the electricity you produce at the same price as they sell their electricity to you. The renewable electricity is produced as Direct Current

(DC). The DC electricity from the panels passes through a grid-interactive inverter, which converts the DC electricity into Alternating Current (AC). Electricity supplied by the grid is AC.

This AC electricity is then used by any appliances operating in the house. If more electricity is produced than the house needs then the excess will be fed into the main electricity grid. Conversely, when the renewable system isn't generating enough electricity to power the house, the house will draw power from the grid. Grid interactive systems eliminate the need for a battery backup for when the sun doesn't shine (if it's a solar system) or the wind doesn't blow (if it's a wind turbine). In effect, the grid serves as your battery. This means that maintenance costs for your system will be less. It should be noted that without battery storage a grid connected system will shut down when there is no power on the grid.

The main components in a system are the Photovoltaic (PV) panels, Grid Interactive inverter(s), and the meter that records the amount of power produced.

PV Panels: The PV panels convert the light reaching them into DC power. The amount of power they produce is roughly proportional to the intensity and the angle of the light reaching them. They are therefore positioned to take maximum advantage of available sunlight within siting constraints. Maximum power is obtained when the panels are able to 'track' the sun's movements during the day and the various seasons. However, these tracking mechanisms tend to add a fair bit to the cost of the system, so a lot of people either

have fixed panels or compromise by incorporating some limited manual adjustments, which take into account the different 'elevations' of the sun at various times of the year. The best elevations vary with the latitude of your location. In the Southern Hemisphere, these panels should face as close to as possible.

Grid-Interactive Inverter: The Inverter takes the DC power produced by the panels, converts it to AC, and feeds it back into the main electricity grid. Some systems may have a number of smaller Inverters connected in parallel.

Meter: The Meter records the amount of power produced by the system. Note that in some installations, a single meter is used - It goes backwards when power is being generated, and forwards when power is being consumed. There are several different metering configurations available, each with their pros and cons. Ultimately, it's up to the local electricity authority as to which configuration they'll approve. The above diagram represents my configuration of separate generating and consuming meters.