Choosing between on-grid and off-grid solar is one of the most important decisions when going solar. Each type has distinct advantages and limitations.
On-Grid Solar Systems
On-grid (or grid-tied) solar systems are connected to the utility electricity grid. They are the most common and cost-effective type of solar installation in urban and semi-urban India. Solar panels generate electricity during the day. Your home uses this solar power first, and any excess is exported to the grid through net metering. At night or on cloudy days, you draw power from the grid as normal.
Key advantage: Net metering allows you to earn credit for exported energy, significantly reducing your electricity bills. On-grid systems are also less expensive because they do not require batteries.
Key limitation: On-grid systems shut down during a power cut for safety reasons (anti-islanding). They do not provide backup power.
Off-Grid Solar Systems
Off-grid solar systems operate independently of the utility grid. They use battery banks to store solar energy for use when the panels are not generating electricity.
Key advantage: Complete energy independence. Ideal for remote locations where grid power is unavailable or unreliable.
Key limitation: Higher cost due to battery banks. Battery capacity limits how much energy you can use at night. No net metering benefit.
Hybrid Solar Systems
Hybrid systems combine the benefits of both. They connect to the grid for net metering while also including battery storage for backup during power cuts. This is increasingly popular in areas with frequent outages.