On-Grid Solar System in India: How It Works, Cost & Benefits

An on-grid (grid-tied) solar system connects to your local DISCOM grid and feeds surplus electricity back through net metering. It is the most popular and affordable rooftop solar option in India — chosen by 85% of residential installations. On-grid systems qualify for the full PM Surya Ghar subsidy of up to ₹78,000, have no batteries to maintain, and pay for themselves in 3–5 years.

An on-grid system operates in sync with the DISCOM grid. Here is the step-by-step flow:

1. Solar panels generate DC electricity from sunlight during the day.
2. An on-grid inverter converts DC to 230V AC power matching the grid frequency (50 Hz).
3. Your home consumes solar power first. Appliances draw from solar before touching the grid.
4. Surplus power exports to the grid through a bi-directional net meter.
5. At night or on cloudy days, you draw from the grid as usual.
6. Your DISCOM bills the net: units imported − units exported. You pay only the difference.

There are no batteries in this system. The grid itself acts as your storage — you push power in during the day and pull it back at night.

Important safety feature: On-grid inverters include anti-islanding protection. If the grid goes down, your system automatically shuts off to protect line workers. This means on-grid systems do not work during power cuts — a key tradeoff to understand.

An on-grid installation is simpler than off-grid or hybrid because there are no batteries or charge controllers:

• Solar panels — Monocrystalline (most common) or polycrystalline. 25-year warranty standard.
• On-grid inverter — Converts DC to grid-synchronised AC. Includes MPPT tracking for maximum output. 5–10 year warranty.
• Mounting structure — Galvanised iron or aluminium rails. Flush-mount for flat roofs, tilt frames for sloped roofs.
• Bi-directional meter — Replaces your existing meter. Records import and export separately.
• AC/DC protection — Isolators, surge protection devices, MCBs, earthing kit.
• Cabling — DC solar cables (panel to inverter), AC cables (inverter to distribution board).

No batteries, no charge controller, no battery management system — which is why on-grid systems cost 30–40% less than off-grid or hybrid equivalents.

Net metering is what makes on-grid solar financially powerful. Instead of storing surplus energy in expensive batteries, you bank it with the grid for free.

How it works in practice:

• A 3kW system generates ~13 units/day. If your home uses 8 units during daylight, 5 units export to the grid.
• At night you consume ~5 units from the grid.
• Your net consumption: 0 units. Your bill: just the fixed charges (₹50–₹200/month).

Settlement rules vary by state:

• Annual rollover (Maharashtra, Karnataka, Gujarat) — credits accumulate for 12 months before settlement.
• Monthly adjustment (Delhi, UP) — credits applied each billing cycle.
• Feed-in tariff (some states) — DISCOM pays you a fixed rate per exported unit instead of credits.

Your installer handles the net metering application, meter replacement, and DISCOM liaison. Timeline: 2–6 weeks after installation.

Complete net metering guide by state →

On-grid is the right choice if:

• Your area has reliable grid power — fewer than 2–3 hours of outage per day
• You want the lowest upfront cost — no battery expense
• You want government subsidy — only on-grid qualifies for PM Surya Ghar
• You want the fastest payback — 3–5 years vs 7–10 for off-grid
• You prefer low maintenance — no battery replacements

If power cuts are a concern, consider a hybrid system instead — it gives you grid-tie benefits plus battery backup, though at a higher cost.

On-grid solar is the most straightforward path to cutting your electricity bill. Solar Vipani connects you with 2–3 verified local installers who will design a grid-tied system for your roof and provide comparable quotes — free and without obligation.

Get your free on-grid solar quotes →