On-Grid vs Off-Grid vs Hybrid Solar
Verdict
Verdict: On-grid is the right choice for most Indian homes: cheapest per kW, eligible for PM Surya Ghar subsidy, and the fastest payback — but it gives no backup during a power cut. Choose hybrid only if outages genuinely disrupt your life; the battery bank typically adds 40–70% to system cost. Off-grid makes sense only where there is no reliable grid at all.
Side-by-Side Comparison
| Criterion | On-Grid | Hybrid |
|---|---|---|
| Batteries required | No | Yes |
| Relative cost per kW | Baseline (lowest) | +40–70% |
| Backup during power cut | None (anti-islanding) | Yes, on backed-up circuits |
| Net metering / export credits | Yes | Yes |
| PM Surya Ghar subsidy | Eligible | Solar portion typically eligible |
| Typical payback | 3–5 years | 6–9 years |
| Maintenance burden | Minimal | Battery care and eventual replacement |
| Best fit | Reliable-grid urban homes | Outage-prone areas |
Bold green marks the stronger option on that criterion. Figures are typical Indian market values as of 2026 and vary by brand, site, and supplier.
Choose On-Grid If…
- Your area has reasonably reliable grid supply
- You want the fastest payback and lowest upfront cost
- You are claiming the PM Surya Ghar subsidy on a standard residential system
- You already own an inverter-battery (UPS) for outage backup
Choose Hybrid If…
- Power cuts are frequent or long enough to disrupt work, study, or medical needs
- You want solar to charge your backup instead of the grid or a diesel generator
- You are willing to accept a longer payback in exchange for energy security
- You run critical loads that cannot tolerate interruption
The Backup Misunderstanding
The single most common surprise in Indian rooftop solar: a standard on-grid system shuts down during a power cut. This is not a fault — it is mandatory anti-islanding protection preventing your panels from energising a line that utility workers believe is dead.
If a salesperson implies an on-grid system will run your home during outages, that is a red flag. Backup requires batteries and a hybrid inverter, and the honest conversation is about what that costs.
Where Off-Grid Fits
Off-grid — no grid connection at all, batteries carrying the full load — is a niche in India: remote farms, telecom towers, island communities, and sites where extending the grid costs more than the solar plant. It is sized around load and autonomy days rather than around a bill, and battery cost dominates the economics.
For anyone with a working grid connection, off-grid is almost always the wrong answer: you pay for battery capacity to replace power you could import cheaply.
Frequently Asked Questions
- Will my solar work during a power cut?
- Only with a hybrid or off-grid system. Standard on-grid systems shut down during outages for line-worker safety — a legal requirement called anti-islanding, not a defect.
- Can I add batteries to an on-grid system later?
- Often yes, via an AC-coupled battery system, without replacing the existing inverter. It costs more than building hybrid upfront, but it is a valid staged approach.
- Is a hybrid system eligible for the PM Surya Ghar subsidy?
- The grid-tied solar portion is generally eligible when it meets scheme requirements (ALMM/DCR modules, registered vendor). Batteries are not subsidised. Confirm current rules with your DISCOM.