On Grid vs Off Grid Solar: Which One Suits You
The choice between on grid vs off grid solar comes down to a single trade you cannot avoid: an on-grid system qualifies for up to ₹78,000 in subsidy and gives you nothing during a power cut, while an off-grid system runs through every outage and receives no subsidy at all. Everything else follows from that. On grid is cheaper because the grid does the job a battery would do; off grid is more expensive because you buy that battery, replace it every few years, and fund the whole thing yourself. Most Indian households with a working grid connection should be choosing between on grid and hybrid, not between on grid and off grid.
At a glance
On grid | Off grid | Hybrid | |
|---|---|---|---|
Battery | None | Required | Usually fitted |
Grid connection | Required | Not used | Required |
Power during an outage | None | Yes | Yes |
PM Surya Ghar subsidy | Up to ₹78,000 | None | Panel capacity only, not the battery |
Net metering | Yes | No | Yes |
Cost per kW | ₹55,000 – ₹85,000 | Substantially higher | Higher than on grid |
Ongoing cost | Panel cleaning | Cleaning plus battery replacement | Both |
Best for | Bill reduction, stable grid | No grid available at all | Bill reduction plus backup |
What is on grid and off grid solar system?
The two describe how a solar installation relates to the utility network, and the presence or absence of a battery follows from that.
An on grid solar system is wired to the utility grid with no battery. Solar serves your home in real time, surplus is exported through a bi-directional net meter and credited against your bill, and you import from the grid whenever panels are not producing enough. The grid performs the storage function.
An off grid solar system operates entirely independently of the utility network. Solar charges a battery bank, and everything in your home runs from that battery through an off-grid inverter. Nothing is exported, nothing is imported, and there is no meter relationship with any distribution company.
The third configuration matters because it is what most people actually want. A hybrid system is grid-connected like on grid, and battery-equipped like off grid. It exports surplus, earns net metering credits, qualifies for subsidy on its panel capacity, and keeps running during a cut.
Question to ask yourself | On grid | Off grid | Hybrid |
|---|---|---|---|
Do I have a grid connection? | Required | Irrelevant | Required |
Do I need power during cuts? | No | Yes | Yes |
Do I want subsidy? | Yes | Not available | Yes, on panels |
Am I willing to replace batteries? | Never | Every 3 to 5 years for lead acid | Yes |
Why on grid gives no backup
This is the fact that decides the comparison, and it is not a brand limitation or a cost-cutting measure.
Every grid-tied inverter implements anti-islanding protection under IEC 62116. When the grid fails, a lineman may be working on a conductor he has isolated and believes to be dead. If rooftop systems continued exporting, they would re-energise that line. So grid-tied inverters detect the loss of grid reference and disconnect within milliseconds.
The practical effect is stark. On a bright afternoon during a four-hour load-shedding block, an on-grid system in full sun produces nothing at all. Panels are working; the inverter has taken itself offline deliberately. The mechanism is explained in the on grid solar system diagram, which shows the three states clearly.
Bottom line: if your area sees two or more hours of unscheduled cuts on a typical summer day, on grid is the wrong configuration regardless of price.
The subsidy asymmetry
The financial gap between the two is larger than the hardware difference alone suggests, because policy sits on one side of it.
On grid | Off grid | |
|---|---|---|
PM Surya Ghar eligibility | Yes | No |
Maximum central subsidy | ₹78,000 | ₹0 |
Net metering credits | Yes | Not applicable |
Battery cost | None | Full cost, self-funded |
Battery replacement over 10 years | None | Two to three cycles on lead acid |
Off-grid and battery-based standalone systems are explicitly excluded from the scheme, and battery storage is not subsidised in any configuration, including within a hybrid system where the panels do qualify. The full eligibility position, including the conditions that get applications rejected, is in the PM Surya Ghar eligibility guide.
That asymmetry is deliberate policy. The scheme exists to add generation capacity to the grid, not to help households disconnect from it.
What is off grid and on grid solar in terms of running cost?
The purchase price gap understates the difference, because off grid carries a recurring cost that on grid does not.
An off-grid system cycles its battery every single day, discharging each evening and recharging each morning. That is 365 cycles a year, against perhaps 60 to 150 for a battery in ordinary inverter backup duty. Daily cycling shortens lead acid battery life to roughly two to three years, so a ten-year horizon includes three or four replacements.
Cost element | On grid | Off grid |
|---|---|---|
Upfront | Lower | Higher, by the cost of the battery bank |
Subsidy | Up to ₹78,000 | Nil |
Battery replacement | None | Every 2 to 3 years (lead acid), 8 to 10 (lithium) |
Panel cleaning | Same | Same |
Export income or credit | Yes | None |
Grid fixed charges | Usually still payable | None |
If off grid is genuinely your only option, battery chemistry is the decision that dominates total cost, and the lithium versus tubular comparison for solar works through why daily cycling changes that answer compared with ordinary backup duty.
The honest case for each
On grid is the right answer when:
- Your grid is reliable and cuts are under an hour a day
- Your goal is bill reduction, measured in rupees
- You want the fastest payback available, typically three to five years
- You want subsidy, which is only available here and on hybrid
Off grid is the right answer when:
- There is genuinely no grid connection available, and getting one is not practical
- The site is remote: a farm, a site office, a hill property beyond the last pole
- The cost of extending a grid connection exceeds the cost of storage
- Independence from the utility is itself the objective, accepted at a price
Hybrid is the right answer when, and this is most people:
- You have a grid connection and want your bill down
- You also want the lights and fans on during a cut
- You are willing to pay a premium over on grid for that combination
Decision framework
Fit | Situation | Choose |
|---|---|---|
Strong fit, on grid | Metro or stable supply, cuts under 1 hr/day, bill above ₹2,500 | On grid, 3kW, full subsidy |
Strong fit, on grid | Consumption 300 to 450 units, subsidy-driven decision | On grid at 3kW where subsidy caps |
Strong fit, hybrid | 2+ hrs of daily cuts and a bill worth reducing | Hybrid, claim subsidy on panels |
Strong fit, hybrid | Unpredictable rather than scheduled outages | Hybrid. You cannot plan around unpredictability |
Strong fit, off grid | No grid connection at the site at all | Off grid, sized on genuine daily load |
Marginal, off grid | Grid exists but is very poor | Usually hybrid is better. You keep the subsidy and the credits |
Not a fit, on grid | Backup is the actual requirement | Wrong product entirely |
Not a fit, off grid | Grid available and reliable | You are paying for storage you do not need and forfeiting ₹78,000 |
The two "not a fit" rows are where most of the wasted money in Indian residential solar sits. Buying on grid when you needed backup means discovering on the first hot afternoon that the system does nothing. Buying off grid when the grid works means funding a battery bank, replacing it repeatedly, and forfeiting the subsidy for independence you did not need.
Frequently asked questions
What is the difference between on grid and off grid solar?
An on grid solar system connects to the utility network with no battery, exporting surplus for net metering credits and drawing from the grid when panels fall short. An off grid system runs independently with a battery bank and no grid relationship at all. On grid is cheaper and subsidy-eligible; off grid works during outages.
What is on grid and off grid solar system, in simple terms?
On grid means the grid acts as your storage: you push surplus out during the day and pull it back at night, settling the difference on your bill. Off grid means a battery acts as your storage, and the utility is not involved. The presence or absence of that battery drives every other difference in cost, subsidy and behaviour.
Which is better, on grid or off grid solar?
On grid is better for most Indian households with a working grid connection, because it costs less, qualifies for up to ₹78,000 in subsidy and pays back in three to five years. Off grid is better only where there is no grid connection available. If you have a grid and also need backup, hybrid is usually the right answer rather than either extreme.
What is off grid and on grid solar in terms of cost?
On grid costs ₹55,000 to ₹85,000 per kW installed and receives up to ₹78,000 in subsidy. Off grid costs substantially more because of the battery bank, receives no subsidy, and adds a recurring replacement cost every two to three years on lead acid chemistry. Over ten years the gap is much wider than the purchase prices suggest.
Can an off grid solar system get the PM Surya Ghar subsidy?
No. Off-grid and standalone battery-based systems are explicitly excluded from the scheme, which requires a grid-connected installation with net metering. Battery storage is not subsidised in any configuration, including within a hybrid system where the panel capacity does qualify.
Does an off grid solar system work during a power cut?
Yes, and that is its entire purpose. Because it has no relationship with the grid, a grid failure is irrelevant to it. Your loads are running from the battery bank regardless of what the utility is doing, which is why it suits sites with no grid connection or genuinely unreliable supply.
Is hybrid better than both on grid and off grid?
For a household that has a grid connection and also wants backup, usually yes. Hybrid keeps net metering and subsidy eligibility on panel capacity while providing power during outages. It costs more than on grid, and if your grid is genuinely reliable the battery is money spent on a problem you do not have.
Can I start with on grid and add a battery later?
Not without replacing the inverter, which costs ₹45,000 to ₹70,000, because an on-grid inverter has no battery management hardware. If there is any realistic chance you will want storage within five years, a hybrid inverter with the battery port unused costs ₹20,000 to ₹35,000 more at purchase and avoids that replacement.
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