Grid Tie Power Plant (On-Grid) Back

Solar power systems that are connected to the electricity grid otherwise known as grid connected, grid tied, on-grid photovoltaic systems generate electricity for your home or place of work and feed excess energy produced back into the electricity grid system.

Grid connected systems are designed to replace all or a portion of the building’s total electricity needs. The energy generated by such a system is used first within the home, and surplus energy can then be sold back to the grid. The surplus energy “spins the electric meter backwards” when the energy produced by the solar PV system is greater than that being consumed by the home. In actual fact the utility company will normally install an export meters which measure the amount of electricity generated by the solar PV system.


In a typical grid-tied solar system, the DC electricity produced by the solar array. It’s fed by cables into a combiner (junction) box where the solar panels are terminated and connected together. A cable from the combiner box feeds the DC electricity into a grid-tied inverter. The inverter converts the DC electricity into AC electricity which is used by the appliances or fed into the grid. The output from the inverter is fed via a fuse directly into the main distribution (fuse board).


Advantages and Disadvantages of Grid Connected Systems


There are two types of grid connect systems, those without battery backup and those with battery backup. The second option is less popular and usually takes long time as pay-back period.

Grid connected systems without a battery consist of two main components, a solar PV array and a grid-connect inverter. If the utility grid fails then the solar PV array has no way of providing power as the inverter will automatically disconnect itself from the utility grid.

Grid-tied systems with a battery backup also have an array and a grid-tied inverter, but include the addition of a battery bank and charge controller. Systems with a battery bank can provide power in the event of the electricity (utility) grid failure.


There are many advantages of using a grid connected system


a) Simple to install;

b) High efficiency;

c) reliable;

d) flexible;

If we examine a typical installation, below a number of essential components comprise the solar photovoltaic system.


1. Solar panels - one or more modules wired together to generate a specific voltage and current


2. Combiner (junction) Box - allows termination of the solar panels


3. Grid tied inverter - device that converts DC (direct current) to AC (alternating current).


4. Import / export meter - records energy generated and consumed


5. Grid connect point - distribution board connection


6. Electrical load - appliances that are powered by alternating current.



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