How Long Does Solar Installation Take in India?

ALMM and inverter compliance: MNRE’s current ALMM page publishes solar PV module and cell lists, not an inverter list. Verify the inverter’s exact model documents and applicable scheme or DISCOM requirements separately.

You have decided to go solar. The quotes are in, the subsidy is understood, the system is sized, and now the most practical question: how long before the panels are on the roof and the meter is running backwards? The honest answer involves two very different parts: the physical installation (fast) and the DISCOM approval (slower and variable by DISCOM). This guide maps every stage and what to get in writing for each. It quotes no state-wise approval times because we found no official source for them.

Direct answer. No source we can cite gives a standard installation time for India. Physical installation of a small residential system is commonly quoted as one to two days; the DISCOM steps (feasibility, inspection, net meter and commissioning) and the subsidy credit depend on your DISCOM and on the portal. The “Solar Installation Timeline: 6 Stages” framework below maps every phase, who is responsible and what to get in writing.

For what to expect after your system is commissioned, see what to expect in Year 1 of solar ownership India.

Stage 1: Site Survey

The site survey is the starting gun. A qualified site assessor from your chosen installer visits your home to capture the technical data needed for system design. Larger commercial projects often commission a formal site survey and land feasibility study before design work even begins, since roof load, shading, and grid access all need sign-off first.

A serious site survey should produce a written report. If an installer offers to design your system without a site visit, that is a significant warning sign. Remote surveys based on satellite images are acceptable as a preliminary step but not as a substitute for the physical visit.

What to get in writing: the survey date and the report date.

Stage 2: Quotation and Agreement

After the site survey, an installer produces a detailed quotation. Installers running dedicated quotation software instead of manual spreadsheets can turn this stage around faster and with fewer line-item errors. The quotation should include:

• Panel make, model, wattage, and ALMM certification status
• Inverter make, model, rated capacity, and warranty terms
• DC cable specification (voltage rating, cross-section, length)
• Mounting structure type (ground mount, rooftop ballasted, or flush mount)
• Itemised cost breakdown (equipment, installation, DISCOM application fee)
• Generation estimate (monthly breakdown, not just annual total)
• Proposed commissioning date

After you accept the quotation and pay any advance, the installer places the equipment order; agree the advance and the payment milestones in writing.

What to get in writing: the quotation validity, the advance amount and the proposed dates for each stage.

Stage 3: Equipment Procurement

Equipment procurement is the phase between order placement and delivery at your site, and it depends on the installer’s stock and the supplier’s lead time.

• Inverter availability: ask whether the exact model is in stock locally.
• Panel availability: ask whether the exact ALMM-listed panel model is in stock or must be ordered.
• Mounting structure: ask whether it is stocked or fabricated to measurement.

For large commercial projects (50 kW and above), procurement from ALMM-listed suppliers can take longer if custom panel quantities require a factory order; ask for the supplier’s committed delivery date.

What to get in writing: the committed delivery date for each major item and the remedy if it slips.

Stage 4: Physical Installation

This is usually the fastest stage. Many installers quote one to two days for a small residential system installed by a crew of a few workers; ask for the crew-days in your quote.

Day 1: Mounting structure installation on the roof, drilling anchor bolts into the concrete (or using ballast weight blocks on flat roofs), placing aluminium rails, and securing panels to the rails.

Day 2 (or afternoon of Day 1 for smaller systems): DC wiring from panels to inverter; inverter mounting on the wall; AC wiring from inverter to the distribution board; earthing and bonding; final inspection by the site supervisor.

Commissioning of the inverter can happen on the same day as physical completion. The system may run in zero-export mode until the DISCOM net meter is installed.

Key safety tasks during installation include:

• DC cable routing through conduit (UV-protected, rodent-proof)
• MC4 connector assembly and torque verification
• Surge protection device (SPD) installation at both DC and AC sides
• Earth continuity testing across the entire array

For the commissioning checklist, see solar inverter commissioning in India.

What to get in writing: the installation start date and the date the installer will submit the DISCOM documents.

Stage 5: DISCOM Application and Net Metering Approval

This is the stage that most often decides how long the whole process takes, and its duration depends on your DISCOM. The DISCOM steps usually involve:

1. Submission of application (physical or online via state DISCOM portal or PM Surya Ghar portal)
2. DISCOM technical inspection of the installation
3. Technical feasibility confirmation (the feeder can accommodate your system’s export capacity)
4. Approval of the single-line diagram and inverter specifications
5. DISCOM crew dispatched to install the bidirectional net meter
6. Net meter installation and calibration
7. Commissioning certificate issued

The Solar Installation Timeline: 6 Stages

We found no official state-wise net metering approval times and the third-party figures we saw conflict, so there is no state table here. Ask your DISCOM’s solar cell for its current timelines, and ask installers who have recently completed projects in your DISCOM area how long each step took.

Common bottlenecks reported for DISCOM steps include limited inspection capacity, manual processing, incomplete applications and waiting for meters; which applies to you depends on your DISCOM.

Stage 6: Subsidy Disbursement

For PM Surya Ghar registered installations, the central government subsidy is credited to the registered bank account after the DISCOM’s commissioning report is accepted on the portal. The time varies: third-party guides quote about 30 days from the commissioning certificate, and one installer’s kit page quotes up to 90 days after commissioning, so check the portal status and your DISCOM.

The central subsidy slabs for a residential system (MNRE guidelines, as in our PM Surya Ghar subsidy amount guide):

• 1 kW: ₹30,000
• 2 kW: ₹60,000 (₹30,000 per kW for the first 2 kW)
• 3 kW and above: ₹78,000 (the third kW adds ₹18,000, and the amount is capped at ₹78,000)

State-level subsidies vary and are disbursed separately via state channels.

What to get in writing: the bank account linked to the portal and the portal status after commissioning.

What Causes Delays: And What You Can Do

Delay 2: Missing or incorrect documents. Ensure all documents are complete before application: property ownership proof, DISCOM account number, Aadhaar linked to bank account, and installer’s empanelment certificate.

Delay 3: Equipment procurement delays. Choose an installer who already holds inverter and panel stock rather than one who orders after signing. Ask the installer for the current stock position at the time of agreement.

Delay 4: Structural issues discovered during installation. If the roof requires reinforcement or the distribution board needs upgrading, the remedial work adds time; the site survey should find these issues early.

The find a reliable solar installer guide covers how to evaluate installers on their DISCOM approval track record, an underrated criterion that directly affects your total timeline. Homeowners comparing full-service solar EPC companies against smaller local installers should weigh this track record alongside price, since a turnkey EPC typically owns the DISCOM follow-up rather than leaving it to the homeowner.

How PM Surya Ghar Has Changed the Timeline

The PM Surya Ghar Muft Bijli Yojana, launched in February 2024, introduced a national portal that tracks each application through registration, feasibility, installation, inspection and subsidy. Homeowners who register on the portal gain visibility into their application status and a formal route to raise a delay. We found no primary-source day limits for the DISCOM steps, so ask the DISCOM and the portal for the time limits that apply to your application.

Common Timeline Mistakes and How to Avoid Them

Where Qbits Fits in the Installation Timeline

• Solar Inverter Commissioning Guide: Step-by-step Stage 4 commissioning checklist.
• Authorised Service Partners: Search the current directory, then confirm partner status, location coverage, service scope, response process and fees in writing.

For post-commissioning questions, contact Qbits with the exact model and project records. Confirm the available support channel, responsible party, timing, and scope rather than assuming a call format or resolution time.