1. Grid-Tied System:

This is the most popular PV installation system. It works as below:

• Any PV system produce energy when Sun is available.
• While designing PV system your total requirements are considered. (Including non-sun hours)
• This system is connected with your electric supplier / utility company.
• During day time, this PV system produce more energy than required in the day time. Additionally generated energy is sent to your utility co. They return your supply back to you as needed by you, when sun is not available and you are not producing energy.
• This is also called net-metering. In the end of the month, utility company charge you for the net use only.

2. Battery-base or stand-alone System:

This system is popular where reaching to utility company is not possible like remote area, moving vehicle or when the customer do not want to remain connected to utility company. It works as below:

• This PV system also produce energy when Sun is available.
• While designing PV system your total requirements are considered. (Including non-sun hours)
• This system is not connected with your electric supplier / utility company.
• During day time, the PV system produce more energy than required in the day time. Additionally generated energy is stored in battery. The stored power can be used as needed by your business, when sun is not available and you are not producing energy.
• As you are not connected to any utility company, you don't pay anything to utility co.