Solar installation process in India: step-by-step homeowner guide for 2026

In 50 words: Solar installation in India in 2026 takes 30–45 days from contract signing to commissioning. The process spans site survey, structural assessment, DISCOM application, equipment delivery, physical installation, inspection, net-metering, and commissioning. This guide walks through every step, what to expect, and what can go wrong.

If you're installing rooftop solar at home or for your business, you're not buying a product — you're buying a project. The 30–45 day installation process involves multiple parties (you, vendor, DISCOM, MNRE registration, sometimes a structural engineer), several inspections, and a sequence of dependencies where any step can delay the next. This guide breaks down each step so you know what should happen and what to push on if it doesn't.

Pre-purchase: deciding to go solar
Vendor selection and quotation
Site survey and structural assessment
Subsidy application (PM Surya Ghar)
DISCOM technical feasibility
Equipment ordering and delivery
Physical installation
Electrical connections
DISCOM inspection
Net-meter installation
System commissioning
Post-commissioning: monitoring, maintenance, troubleshooting
What can go wrong (and how to handle it)
FAQ

1. Pre-purchase: deciding to go solar

Before contacting any vendor, decide:

How much capacity you need — pull your last 12 months of electricity bills, calculate average monthly units. Most Indian homes consuming 500–800 units/month need 3–5 kW of solar.
Roof suitability — south-facing is best, southwest/southeast acceptable. Available shadow-free area: ~10 sq meters per kW (so 50 sq meters for 5 kW).
Budget and financing — cash, bank loan, or financing through the vendor.
Whether you want battery storage — if yes, get a hybrid inverter from day 1; battery can be added later.
Timeline expectations — realistic timeline is 30–45 days, not "1 week."

2. Vendor selection and quotation

Get quotes from at least 3 MNRE-registered vendors in your area. Compare:

Total installed cost (out-the-door price, not just equipment)
Equipment specs: module brand, model, capacity, warranty; inverter brand, model, capacity, warranty
ALMM listing status of modules and inverter (required for PM Surya Ghar subsidy)
Installation warranty (typically 5 years on installation workmanship)
Post-installation O&M offering (often free for year 1, then optional)
References — get 3 customers to call

Red flags during quotation:

Quotes much below market (often = corner-cutting on equipment)
High-pressure "today only" pricing
Vague equipment specifications
No physical office to visit
Reluctance to provide written warranty terms

Take at least a week to evaluate quotes before signing. Don't be rushed.

3. Site survey and structural assessment

Once you've selected a vendor and signed a contract (typically with 20–30% advance), the first physical step is a site survey. The vendor visits your property to:

Measure roof area and identify panel placement
Assess structural capacity — can your roof support the additional ~15 kg/m² of solar panels + mounting?
Check for shading from trees, other buildings, water tanks, parapet walls
Identify electrical panel location for inverter placement
Plan cable routes between roof panels, inverter, and main electrical panel

For older buildings or buildings with structural concerns, a separate structural engineer's assessment may be needed (additional ₹3,000–8,000 cost, sometimes included in vendor scope).

Outcomes from this step:

Confirmed panel layout
Confirmed inverter location
Identified any pre-installation work needed (waterproofing, structural reinforcement, electrical panel upgrade)

4. Subsidy application (PM Surya Ghar)

If you're using PM Surya Ghar subsidy (recommended — see our PM Surya Ghar guide):

Vendor typically handles the application on your behalf (verify this is included in their scope)
You provide required documents (Aadhaar, electricity bill, property docs, bank details)
Application submitted on pmsuryaghar.gov.in
DISCOM technical feasibility runs in parallel (7–14 days)

If application is approved, sanction letter issued and you proceed. If rejected, vendor should resubmit with corrected information.

5. DISCOM technical feasibility

DISCOM evaluates whether your existing electrical connection can accommodate the proposed solar capacity. Considerations:

Service line capacity — your single-phase 10 kW connection supports up to 10 kW solar; larger systems may need connection upgrade
Phase balance for three-phase connections
Distribution transformer loading for very large systems
Local grid constraints

For typical residential systems (3–5 kW), feasibility approval is usually routine. Approval takes 7–14 days.

If DISCOM requires service line upgrade or other modifications, expect cost addition (₹15,000–50,000) and timeline extension (2–4 weeks).

6. Equipment ordering and delivery

After DISCOM feasibility approval, vendor orders equipment:

Modules: typical lead time 5–10 days (Tier 1 brands maintain inventory)
Inverter: 3–7 days
Mounting structures: 3–5 days
Cables, connectors, switchgear: typically in stock with vendor

Equipment is delivered to vendor's warehouse first, then to your site on installation day.

7. Physical installation

The actual installation typically takes 2–3 days for a residential 5 kW system:

Day 1: Mounting structure

Foundation preparation (if needed)
Mounting structure assembly and anchoring to roof
Waterproofing around mount anchors
Quality check: structural stability, water-tight seals

Day 2: Solar panel installation

Panels placed on mounting structure
Tilt angle verified (typically 10–25° in India depending on latitude)
Panels secured with clamps
DC cabling between panels (series strings)

Day 3: Inverter and balance-of-system

Inverter mounted in shaded outdoor location or ventilated indoor location
DC cables from panels to inverter
AC cables from inverter to your electrical panel
Surge protection device installation
Earthing (grounding) connections

Watch out for:

Insufficient roof waterproofing around mount anchors (causes leaks during monsoon)
Loose connections in DC cabling (cause efficiency loss + safety risk)
Inverter placement in direct sun without ventilation (causes derating)
Missing or undersized earthing

8. Electrical connections

Final electrical work:

AC isolator installation between inverter and electrical panel
Net-meter ready AC distribution
Bidirectional electrical panel modification (if needed)
MCB sizing check for the new solar load
Earthing system integration with home earthing

Once connections are complete, vendor tests:

Insulation resistance
Earth continuity
Inverter standalone operation (before grid connection)

System is "installed" but not yet "commissioned" — net-meter and DISCOM inspection are still pending.

9. DISCOM inspection

Vendor applies to DISCOM for inspection. DISCOM technician visits to verify:

Installation matches approved capacity
ALMM-compliant equipment used
Safety standards met (earthing, isolation, surge protection)
Cable sizing and switchgear appropriate
Bidirectional electrical panel ready for net-meter

If inspection passes, DISCOM clears for net-meter installation. If issues found, vendor addresses and re-inspection scheduled.

Typical inspection timeline: 5–14 days after application.

10. Net-meter installation

After DISCOM inspection clearance:

DISCOM technician installs bidirectional net-meter (replaces your existing meter)
Old meter reading captured and final bill issued
New net-meter records energy imported AND exported
Meter sealed with DISCOM tamper-evident seals

Net-meter installation takes a few hours. Usually scheduled within 7–14 days of inspection approval.

11. System commissioning

With net-meter in place:

Inverter switched on
Grid synchronisation verified
System monitoring app set up
Initial generation data verified against expected production
Vendor walks you through:
- Monitoring app usage
- When and how to clean panels
- Warning signs to watch for
- Service contact information

System is now operational. You start seeing solar generation in your monitoring app from day 1.

12. Post-commissioning: monitoring, maintenance, troubleshooting

First 30 days

Daily check monitoring app to verify expected generation
Verify net-meter is recording exports correctly
Note any unusual behaviour (sudden drops, error alerts)

Ongoing maintenance

Panel cleaning: monthly during dry season, more frequently in dust-heavy areas
Visual inspection: quarterly check for loose mounts, damaged cables, debris on panels
Inverter health check: annual professional service recommended
Performance verification: monthly comparison of actual vs expected generation

Common issues

Sudden generation drop: usually shading from new obstruction, soiling, or inverter fault
Inverter alarm/error: check app for error code, contact vendor service
Net-meter not recording exports: DISCOM meter issue, contact DISCOM
Lower-than-expected generation: shading, soiling, or seasonal variation (winter days are shorter)

13. What can go wrong (and how to handle it)

Vendor disappears mid-installation

Rare but happens with smaller unregistered vendors. Protections: only use MNRE-registered vendors; pay in stages (avoid full upfront payment); keep documentation.

DISCOM feasibility rejection

Usually resolvable. Vendor should advise on what to change (capacity, equipment, connection upgrade). If genuinely unjust, appeal to State Electricity Regulatory Commission.

Subsidy delays

Beyond 60 days is unusual. Check application status on PM Surya Ghar portal. Raise grievance through the portal.

Installation problems discovered post-commissioning

Get vendor to fix under installation warranty (typically 5 years). For equipment failures: invoke manufacturer warranty through vendor.

Net-meter not installed in reasonable time

Escalate to DISCOM consumer service. If still unresolved, file complaint with State ERC.

14. Frequently asked questions

Can I install solar myself to save money?

Not recommended. Requires electrical certification, structural assessment, DISCOM coordination, and warranty considerations. Self-installation typically voids equipment warranties and may not qualify for PM Surya Ghar subsidy.

Do I need to be home during installation?

Yes for initial installation days (3 days typical) and for inspection. Vendor should be able to handle most of the documentation work without your physical presence beyond signing.

Will rooftop solar damage my roof?

Properly installed solar adds minimal load (~15 kg/m²) and shades the roof (reducing thermal stress). Waterproofing around mount anchors is critical — verify this is done correctly.

Can I add more panels later?

Yes, capacity expansion is possible. Considerations: spare DC capacity on inverter, available roof space, additional DISCOM approval, and you cannot claim additional PM Surya Ghar subsidy (one-time per property).

What happens during a power outage?

Standard grid-tied systems shut off during outages (safety feature called anti-islanding). For backup during outages, you need a hybrid inverter + battery storage.

How often should I clean my panels?

Monthly during dry/dusty season; weekly during high-dust periods (Rajasthan, Delhi NCR in summer). Just use water and a soft cloth or sponge — no harsh chemicals.

Researched and drafted with AI assistance; reviewed and edited by the named author within 24 hours of draft. Also see: Solar panel cost in India, Best solar inverter for home, PM Surya Ghar subsidy guide.

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