On-Grid vs Off-Grid vs Hybrid Solar in India

The single most consequential choice in an Indian solar purchase is not the panel brand — it is the system architecture. On-grid is cheapest and subsidy-eligible but dies in a power cut; off-grid works anywhere but costs the most per usable unit; hybrid sits in between and is quietly becoming the urban default where outages persist. Here is how to choose.

Walk into any solar vendor’s office in India and you will hear three words thrown around loosely: on-grid, off-grid and hybrid. They describe fundamentally different machines with different costs, different subsidy treatment and — crucially — different behaviour when the lights go out. Getting this choice wrong is expensive in both directions: paying for batteries you never needed, or discovering during your first summer outage that your shiny rooftop system has switched itself off.

The three architectures, in Indian terms

On-grid (grid-tied)

Panels feed a grid-tied inverter that synchronises with your DISCOM supply. Surplus generation is exported under net metering (or net billing in some states — rules vary, verify with your DISCOM) and adjusted against your bill. There is no battery, which is why this is the cheapest architecture per kW and the one the PM Surya Ghar subsidy is built around. The catch: by design, a grid-tied inverter shuts down the moment the grid fails. This is called anti-islanding — a safety requirement that protects linemen working on the network — and it means an on-grid system gives you zero backup during a power cut, even at noon under full sun.

Off-grid

Panels charge a battery bank through a charge controller; an inverter runs your loads entirely from panels and batteries, with no grid connection at all (or the grid deliberately unused). This is the right tool for unelectrified hamlets, remote farmhouses, and agricultural loads far from a feeder. But because every unit you consume must pass through a battery you paid for and will eventually replace, it is the most expensive architecture per usable kWh — and it receives no PM Surya Ghar subsidy.

Hybrid

A hybrid system is grid-tied and battery-backed. On normal days it behaves like an on-grid system, exporting surplus under net metering; when the grid fails, it disconnects from the network and keeps running your essential loads from the battery and panels. For urban and semi-urban households facing regular outages, this is increasingly the sensible middle path, and hybrid inverter prices have fallen steadily as lithium batteries have become mainstream.

What each costs per kW

Treat these as indicative ranges: panel prices, ALMM-listed module requirements, battery chemistry and state-level costs all move the number. Get three quotes and compare like for like.

A decision framework by outage hours

• City or town with rare, short cuts: plain on-grid. Every rupee spent on batteries here is a rupee not earning net-metering credit. Size it with the on-grid solar calculator.
• 2–6 hours of cuts on many days: hybrid, with the battery sized for essential loads only — fans, lights, router, TV, refrigerator — not air conditioners, unless you are prepared to pay for a much larger bank.
• Farm, remote site, or no usable grid: off-grid, sized honestly for your worst month, or — for irrigation specifically — a PM-KUSUM solar pump, which is usually the cheaper route for pumping loads. The off-grid solar calculator works from your load list and autonomy days rather than your electricity bill, which is the right way to size a system with no grid to fall back on.

One more variable worth weighing: outage timing. Daytime cuts are partly self-solving with a hybrid system, since panels can carry loads directly while the sun is up; evening and night cuts fall entirely on the battery, so they drive the bank size and the budget.

How PM Surya Ghar treats each type

PM Surya Ghar Muft Bijli Yojana subsidises grid-connected residential rooftop systems — central assistance of up to ₹78,000 for a 3 kW system under the slab structure current in 2026 (verify the live figures on the official portal, as slabs can be revised). Both plain on-grid and hybrid systems qualify, because a hybrid system is still grid-connected and net-metered; the subsidy applies to the solar system, while the battery is your own expense. A pure off-grid system does not qualify — no grid connection, no net metering, no subsidy. Read our PM Surya Ghar subsidy guide for the slab-wise details and application steps.

Battery chemistry: LiFePO4 vs lead-acid tubular

India’s inverter-battery habit means lead-acid tubular batteries are still everywhere: cheaper upfront, widely serviced, but heavy, maintenance-hungry (distilled water top-ups), only ~50 percent usable depth of discharge, and 3–5 year lifespans. Lithium iron phosphate (LiFePO4) costs more upfront but offers 80–90 percent usable capacity, 8–12 year design life, no maintenance and better cycle economics — on a cost-per-cycle basis LiFePO4 now usually wins. Size either chemistry properly with the battery bank calculator.

The inverter-naming trap in the Indian market

Beware: in Indian retail, ‘solar inverter’ often means a UPS-style inverter-cum-charger that runs loads from a battery and merely accepts solar charging — it does not synchronise with the grid, cannot export, and earns no net-metering credit. A true hybrid inverter is grid-interactive: it exports surplus, complies with grid standards, and is what DISCOMs approve for net metering. Ask the vendor directly: does this inverter export to the grid under net metering, and is it on the DISCOM’s approved list? If the answer is vague, walk away.

Worked example: 3 kW hybrid riding out a 4-hour evening cut

Suppose your area loses power from 6 pm to 10 pm and you want essentials running: 3 fans (225 W), LED lights (60 W), router and TV (120 W), and a refrigerator (~150 W average). That is roughly 550–600 W of sustained load.

The 3 kW array generates roughly 12 kWh on a good day (about 4 units per kW; use the India solar calculator for your city), so daytime charging plus net-metering export continue as normal, and the 5 kWh battery comfortably bridges the evening cut with margin for cloudy-day carryover. Indicatively this system lands around ₹2.4–3 lakh before subsidy in 2026; the PM Surya Ghar subsidy offsets the solar portion, not the battery.

Common mistakes

• Buying on-grid and assuming it works in power cuts — anti-islanding guarantees it will not.
• Paying for batteries in a city with two cuts a year — on-grid plus net metering earns more.
• Sizing the battery for air conditioners without doing the maths — a 1.5-ton AC alone can drain 5 kWh in three hours.
• Buying a UPS-style ‘solar inverter’ and expecting net-metering credit.
• Assuming off-grid systems get PM Surya Ghar subsidy — they do not.
• Comparing quotes without checking whether the battery chemistry, usable capacity and inverter type match.

Frequently asked questions

Does an on-grid solar system work during a power cut?

No. Grid-tied inverters are required to shut down when the grid fails — a safety feature called anti-islanding that protects utility workers. Even in full sunshine, a plain on-grid system produces nothing during an outage. If backup matters, you need a hybrid system with a battery.

Which solar system types qualify for the PM Surya Ghar subsidy?

Grid-connected residential rooftop systems qualify — both plain on-grid and hybrid, since a hybrid system is still grid-connected under net metering. The subsidy (up to ₹78,000 for 3 kW under the slabs current in 2026; verify on the official portal) covers the solar system, not the battery. Pure off-grid systems are not eligible.

How much more does a hybrid solar system cost than on-grid in India?

Indicatively, on-grid runs about ₹50,000–60,000 per kW installed in 2026, while a hybrid system with a modest lithium battery lands around ₹80,000–1,00,000 or more per kW. The difference is essentially the battery and the grid-interactive hybrid inverter. Prices vary by state, brand and battery size, so compare multiple quotes.

Is LiFePO4 worth the extra cost over a lead-acid tubular battery?

Usually, yes. LiFePO4 gives 80–90 percent usable capacity, an 8–12 year design life and zero maintenance, versus roughly 50 percent usable capacity and 3–5 years for tubular lead-acid with regular water top-ups. On a cost-per-usable-kWh-per-cycle basis, lithium now generally wins despite the higher sticker price.