What is Hybrid Solar Power System?

A hybrid solar system fuses the best of both on-grid and off-grid systems: the benefits of a grid connected system, including the ability to earn Feed-In Tariff credits, with the extra peace of mind given by a battery backup. This means that even during a power blackout, you still have electricity. These systems can be described as off-grid solar with utility backup power, or even as a grid-tied solar with battery storage capability. Hybrid systems provide you with the flexibility of being able to store the excess energy generated during daytime instead of feeding it back into the grid (at low tariff).

What to expect?

A continuous uninterrupted power supply that can withstand the impact of weather conditions, fluctuations in grid and blackouts in your area. You can run loads more than the installed capacity of PV plant by consuming the additional required power from the battery bank. Remember it is not just about the economics. Hybrid systems give you the ability of energy security and self-sufficiency, to lock-in your future electricity tariff, to control when you consume your solar power, and to provide an uninterrupted power supply even when others have lost grid power. How would you put a value on that?

Advantages of Hybrid PV systems:

1) Providing uninterruptible supply: Installing a hybrid system from MNM Solar will mean that when the grid fails or there’s cloudy conditions, your system will keep going. Our hybrid systems will disconnect from the grid during blackouts and draw power from the battery bank.

2) Outsmarting the utilities:

In the event that your rooftop is not big enough to install a PV system that negates your utility consumption, a hybrid system can load shift as shown below. This means that the energy you export during the day is not wastefully fed into the grid with minimal financial returns. Instead, it powers the battery banks and draws power from utility only when a lower off-peak electricity rate is available to you.

3) Seize the power: When your electricity usage goes above a certain threshold, utility companies may charge you at an increased rate for this higher level of demand. Hybrid systems are equipped with ‘peak lopping’ where stored power can be drawn, as required, from the batteries to help balance the power usage. ‘Grid support’ is also provided by your hybrid system in the event that your grid connection does not have the capacity to supply a load. In this case, the hybrid system will supply the extra power. And this may allow you to avoid a costly mains upgrade to your property.

Components of Stand-Alone systems:

1) Solar charge controller: Solar charge controllers are also known as charge regulators or just battery regulators. They limit the rate of current being delivered to the battery bank and protect the batteries from overcharging. Good charge controllers are essential for keeping the batteries healthy, which in turn ensures that the lifetime of a battery bank is maximized. We have a battery-based inverter in which the charge controller is integrated.

2) Battery Bank: Since Stand-Alone systems are not connected to the grid, it will be lights out by sunset. For this, we install a battery bank that will ensure continuous power supply throughout the night.

3) DC disconnect switch: AC and DC safety disconnects are necessary for all solar systems. For hybrid solar systems, one extra DC disconnect is installed between the hybrid inverter and the battery bank. It is used to cut off the current flowing between these components. This is highly important for maintenance, troubleshooting and protection against electrical fires.

4) Battery-based Grid-tie inverter: Hybrid solar systems utilize batter-based grid-tie inverters. This device can combine and/or draw electrical power to and from battery banks, as well as synchronize with the utility grid.

5) Net meter: You will need to replace your current power meter with a net meter. This device is capable of measuring power going in both directions, from the house to the grid and vice versa.


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