Grid Tie Inverter - Sell Power to the Electricity Utility


Grid tie inverter is a component used in majority of the solar and wind energy generation projects. Be it a simple home solar power system or a large solar power project, my friend you will always need them.

This small piece of equipment will help you the most out of your home solar energy generation system. The Best thing about this is it helps you to make money by selling the electricity generated from the solar power panels which is fed back to the grid by this little wonder.


How does a Grid-Tie Inverter Work?

The working of grid tied inverters is very much similar to that of any solar power inverter. DC power generated by the solar panels is fed to the inverter and AC power is obtained as output. During the daytime the solar modules generate solar electricity and keep feeding the inverter. As this happens the solar inverter directs the generated electricity to the household electrical loads or is fed to the grid.

The amount of electricity generated depends on the quality of sunlight. If your system produces more power than that is necessary for you, in that case the remaining power will be directed to the grid. But if you require more power than the power produced, then it will be drawn from the utility grid. Thus the utility grid serves as an infinite battery back-up for your system.


Grid Tie Inverter
Grid Tie Inverter Image By Edible_Plum

At the DC side of the system the power output of a module depends on the voltage. So by varying the voltage and the current the maximum power point can be found. Hence most inverters grid tied or off grid include a Maximum Power Point Tracking system

Whereas on the AC side the grid interactive inverter supplies power in the sinusoidal form. The frequency of the power generated must be in sync with the grid frequency. The feed in voltage must not be greater than that of the grid voltage.

On the occurrence of a power outage in the electricity grid the grid tie inverter shuts down. This shut down ensures the safety of the service personnel who attend to the problem of power outage. Each grid interactive inverter must have this feature as mentioned in the National Electricity Code (NEC). This feature of autonomy is a key differentiating factor between solar inverters and grid tie inverters.


Benefits for You!

Obtaining free electricity or lowering your current electricity bills are one of your goals. In that case you will require and additional source of electricity other than the utility grid. Then you must consider a system which is grid tied. If you are residing in a state or country which has the facility of net metering you will be able to rope in maximum benefits.

Reduced system cost is always a key component which reduces the payback period of any home solar power system. But how is this possible? As your system is grid interactive, you save substantial amount of money as you do not buy any battery bank. Plus a battery bank needs to be replaced in a span of 3-5 years and that adds to the overall system cost.

But you will always have the option of adding batteries to your system. The grid-tie inverter will charge the batteries and later will supply power to the grid. In case of a power cut you will still have enough backup until power supply is restored. This option is worthwhile for implementing in developing countries like India, China but is limited only to the individual level. For all of those residing in Europe, North America it’s a boon.

As the cost of electricity continues to rise each day, every one will be looking to offset their energy costs. One of the best ways to do this is to install solar panels along with a grid-tie inverter. You will surely profit from it!



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