PM Surya Ghar Muft Bijli Yojana, Complete 2026 Guide

Every month, millions of Indian homeowners pay electricity bills that could be zero (or very close to zero) under a scheme that’s been running since February 2024. PM Surya Ghar Muft Bijli Yojana is the Government of India’s largest-ever residential rooftop solar subsidy: up to ₹78,000 per household, plus 300 free units a month from a 3 kW system. Awareness is patchy. Applications lag targets. And many homeowners who do apply lose their claim over one avoidable error: an inverter that isn’t on the MNRE ALMM list.

This guide covers the subsidy slabs, eligibility, the five-step application, state top-ups, the common mistakes, and what to look for in an inverter so the claim actually clears.

TL;DR

• PM Surya Ghar gives a central subsidy of ₹30,000 per kW for the first 2 kW and ₹18,000 for the third kW, capped at ₹78,000 for a 3 kW or larger system.
• Only ALMM-listed inverters and panels qualify - a non-ALMM inverter is the single most common reason claims get rejected.
• The application follows five steps: portal registration, DISCOM feasibility approval, empanelled-vendor installation, smart-meter commissioning inspection, and bank-detail upload for disbursement.
• Several states (Gujarat, Maharashtra, UP, Tamil Nadu, Karnataka) add ₹10,000-₹30,000 on top of the central amount.
• The CAPEX (self-owned) model captures the full subsidy and 25-year savings; the RESCO model usually does not pass the subsidy to the homeowner.
• Payback after subsidy typically runs 2-3 years, with 25-year savings of ₹7-10 lakh on a 3 kW system.

PM Surya Ghar Muft Bijli Yojana is the Government of India’s flagship residential rooftop solar scheme, launched in February 2024 with a target of one crore (10 million) households by March 2027. It provides a central subsidy of ₹30,000 per kW for the first 2 kW and ₹18,000 per kW for the third kilowatt (up to a maximum of ₹78,000) paid directly into the homeowner’s bank account after installation and grid commissioning.

The scheme replaces the earlier Grid Connected Rooftop Solar Programme Phase II, sits inside MNRE’s broader rooftop solar scheme architecture, and operates through a single national portal at pmsuryaghar.gov.in, co-ordinated by MNRE and implemented through state DISCOMs. Understanding the scheme from end to end (not just the subsidy headline) is what separates a successful application from a stalled one.

What PM Surya Ghar Is: and What It Means for Your Electricity Bill

PM Surya Ghar Muft Bijli Yojana is not a discount coupon or a promise of free hardware. It is a direct benefit transfer: after you install an approved rooftop solar system through an approved process, the government reimburses a fixed amount into your bank account. The solar system itself then generates electricity for the next 25 years, offsetting your monthly bill through net metering.

The “muft bijli” (free electricity) headline refers to an estimated 300 units per month that a 3 kW system generates under average Indian sunlight conditions, roughly matching the monthly consumption of a typical 2–3 BHK home. If you consume less than you generate, the surplus flows back to the grid and your DISCOM credits it against future bills. If you consume more, you pay only the shortfall.

The Electricity Bill Maths for a Typical Indian Home

Consider a homeowner in Pune paying ₹8,000 per month on a 600-unit consumption pattern at an average tariff of around ₹8 per unit. A 3 kW rooftop solar system would generate approximately 360–420 units per month in Maharashtra’s sunlight conditions. After netting off exports and consumption:

• Monthly bill reduction: ₹2,900–₹3,360 (accounting for export credits and fixed charges)
• Annual saving: ₹35,000–₹40,000
• Gross system cost (3 kW, 2026 market rate): ₹1,50,000–₹1,80,000
• PM Surya Ghar subsidy: ₹78,000
• Net cost to homeowner: ₹72,000–₹1,02,000
• Payback period after subsidy: 2–3 years
• 25-year saving: ₹7 lakh to ₹10 lakh

Those numbers explain why the scheme received over 1.5 crore registrations within 18 months of launch, according to data tracked by Mercom India. Homeowners who want to sanity-check their own roof before applying can run the numbers through a solar cost and savings calculator to see the payback range for their specific bill and roof size. The financial case, even without subsidies, is compelling. With the subsidy, it is close to irresistible for anyone who owns their roof.

₹75,000 crore. The total outlay of PM Surya Ghar Muft Bijli Yojana (India’s single largest rooftop solar scheme) announced at scheme launch in February 2024. Source - MNRE PM Surya Ghar Portal, 2026.

Subsidy Amounts by System Size

The central subsidy under PM Surya Ghar is structured in two slabs, with a hard cap at 3 kW regardless of the size of system you install. The table below shows the exact amounts for the 2026 scheme year; for an interactive breakdown by exact system size and state, use the PM Surya Ghar subsidy calculator.

Key point: Installing a 5 kW or 10 kW system does not increase your subsidy beyond ₹78,000. The scheme is designed to bring the 1–3 kW residential segment within financial reach of the middle class, not to subsidise large systems. Larger systems are fully eligible for net metering, just without additional central subsidy.

For group housing societies and RWAs applying for common-area solar, the rate is ₹18,000 per kW up to a maximum of 500 kW, applicable to common-area lights, pumps, lifts, and other shared loads.

Why the 3 kW Cap Makes Economic Sense

The 3 kW cap aligns with the consumption profile of a typical Indian household. According to JMK Research analysis of residential solar adoption in India, over 70% of residential rooftop installations in the sub-5 kW segment fall between 2 kW and 4 kW. A 3 kW system covers the electricity needs of most 2–4 BHK homes with air conditioning. Going beyond 3 kW often means exporting a large surplus at the (usually lower) export tariff, which reduces returns. For most homeowners, 3 kW is the economically optimal size, which is exactly where the subsidy cap sits.

Who Qualifies for PM Surya Ghar

Eligibility criteria are broader than most homeowners assume. The scheme is deliberately inclusive, with no income cap, a deliberate policy choice by MNRE to avoid the administrative overhead of means testing at scale.

• Residential electricity consumer: your connection must be classified as domestic/residential by your DISCOM. Commercial, industrial, and agricultural connections do not qualify for the household subsidy.
• Valid DISCOM connection: you must have an active metered electricity account. Off-grid households without a DISCOM connection are not eligible, though they may qualify for separate MNRE off-grid schemes.
• Ownership or NOC: you must own the property where the solar system will be installed, or hold a valid no-objection certificate from the Resident Welfare Association if you are an apartment owner. Tenants are not eligible without the property owner’s involvement.
• No prior subsidy on the same connection: the scheme allows one subsidy claim per electricity consumer number. If your connection has already received a PM Surya Ghar or Phase II RCTS subsidy, it is not eligible again.
• Empanelled vendor and ALMM equipment: the installation must be carried out by a DISCOM-empanelled vendor using ALMM-listed inverters and panels. This is the single most common cause of rejected claims - the full breakdown of why empanelled vendor status matters is worth reading before you sign anything.

For a line-by-line look at who exactly qualifies (age, ownership type, connection category, and the edge cases DISCOMs flag most), see the dedicated PM Surya Ghar eligibility guide.

• Sanctioned load compatibility: your DISCOM will verify that the proposed solar capacity does not exceed your sanctioned load. If needed, you can apply to increase your sanctioned load first.

There is no requirement that you be a first-time solar buyer, no restriction on which Indian state you live in (all 28 states and 8 union territories are covered), and no minimum bill amount threshold. Even households with modest bills can benefit if they have a south-facing roof and ownership.

The 5-Step PM Surya Ghar Application Journey

The most common reason applicants lose their subsidy is not ineligibility, it is procedural error. The application must follow a specific sequence. Deviating from that sequence (for example, installing the system before getting DISCOM feasibility approval) can invalidate the entire claim.

Step 1: Register on the National Portal

Visit pmsuryaghar.gov.in and create an account using your mobile number, state, and DISCOM name. You will need your electricity consumer number from your bill. The portal sends an OTP to your registered mobile. Complete Aadhaar-based e-KYC through the portal.

Documents needed at this stage: Electricity bill (consumer number and DISCOM name), Aadhaar number, mobile number linked to Aadhaar. A full checklist for every stage of the journey, not just registration, is in the PM Surya Ghar documents required guide.

Time: 15–30 minutes if documents are ready.

Step 2: Submit Application and Obtain DISCOM Technical Feasibility Approval

After registration, submit the formal application with your proposed system capacity, roof area, and sanctioned load. The DISCOM reviews whether the grid can absorb additional generation at your connection point and confirms the technical feasibility.

Documents needed: Electricity bill, property ownership proof (sale deed, property tax receipt, or society share certificate), rooftop photographs (minimum 2 clear images showing the roof area), and for flat owners, the RWA no-objection certificate.

Time: MNRE mandates 15 days for DISCOM feasibility review. In practice, it ranges from 7 days in Gujarat and Maharashtra to 30 days in states with higher application backlogs.

What can go wrong: Some DISCOMs return applications citing low sanctioned load. If this happens, apply for a load enhancement simultaneously, it usually takes 7–15 additional days.

Step 3: Select an Empanelled Vendor and Install the System

Once you receive DISCOM feasibility approval (the portal shows a green status update), you can select a vendor. The portal lists all empanelled vendors by state and district, with contact details. If you want an independent second opinion on roof layout or shading before locking in a vendor’s design, national EPCs such as Heaven Green Energy’s residential solar service will assess a roof outside the DISCOM’s empanelled list too.

Critical check before signing any contract:

• Verify the vendor’s empanelment status on the portal, not on their brochure or calling card.
• Confirm the specific inverter model proposed is on the ALMM inverter list at MNRE.
• Confirm the panel brand and model is on the ALMM panel list.
• Get a written quote detailing model numbers, serial numbers, and system capacity.

Time: Installation typically takes 1–3 days for a residential 1–5 kW system once materials arrive. Material procurement by the vendor adds 3–14 days depending on location.

Step 4: Smart Meter Installation and DISCOM Commissioning Inspection

After installation, you or your vendor must notify the DISCOM to schedule the commissioning inspection. A DISCOM engineer visits the site to verify that the system matches the approved specifications, all safety requirements are met (earthing, AC/DC isolators, protection relays), and a bidirectional smart meter has been installed.

The bidirectional meter is essential, it records both the power you draw from the grid and the power you export. Without it, net metering credits cannot be applied to your bill.

Documents verified at inspection: Inverter serial number (cross-checked against ALMM list), panel serial numbers, commissioning report from the vendor, single-line diagram, and earthing test report.

Time: DISCOM inspection typically occurs within 7–15 days of notification. The smart meter, if supplied by the DISCOM, may add 15–45 days in states with procurement delays. This is the most variable step in the journey.

Step 5: Upload Commissioning Report and Bank Details for Subsidy Disbursement

After the DISCOM issues the commissioning certificate (a formal document confirming the system is commissioned and the meter is functioning), log back into the portal and upload:

• Commissioning certificate issued by DISCOM
• Vendor installation invoice
• Bank account details (preferably the account linked to your Aadhaar)
• A signed NACH mandate (bank auto-debit form), used by MNRE for future communications, not for deducting money

MNRE then verifies the documents and initiates direct bank transfer. The portal shows a disbursement status tracker - see the PM Surya Ghar status check guide for exactly what each tracker stage means and how to escalate a stuck application.

Time: 30–60 days from document submission to bank credit in most states.

Pro tip: Ensure your bank account number and IFSC on the portal exactly match your passbook or cancelled cheque. A single digit mismatch causes the transfer to fail and adds 30–45 days to the process.

30 days. The MNRE-mandated maximum time from commissioning report submission to subsidy disbursement into the homeowner’s bank account. Real-world averages run 45–60 days in most states as of 2026. Source - PM Surya Ghar National Portal, MNRE, 2026.

State-Wise Additional Subsidies on Top of the Central Amount

The central ₹78,000 subsidy is the floor, not the ceiling. Several state governments have announced additional state subsidies that significantly improve the economics for residents of those states. The table below reflects 2025–2026 state scheme data, always verify with your State Nodal Agency before finalising your budget, as amounts and eligibility criteria are revised annually.

When central and state subsidies combine, the effective subsidy for a 3 kW system can reach ₹1,20,000–₹1,40,000 in Gujarat and Maharashtra, cutting payback periods to under two years in high-tariff urban areas. Bridge to India analysis shows Gujarat consistently ranks first in residential rooftop adoption, with combined subsidy generosity a leading factor.

States without a separate additional subsidy (Rajasthan, Delhi, West Bengal) still benefit from the full central ₹78,000 amount and from state-level net metering regulations that allow homeowners to earn credit on surplus generation.

The ALMM Requirement: Why Your Inverter Brand Determines Subsidy Eligibility

This section matters more than almost any other in this guide. Many homeowners invest months navigating the PM Surya Ghar application, only to have their subsidy claim rejected at the final step because the installer used a non-ALMM inverter.

The Approved List of Models and Manufacturers (ALMM) is maintained by MNRE and lists the specific inverter and panel models that have passed India’s technical qualification requirements. The list is updated quarterly. Being on the ALMM is not automatic, manufacturers must apply, submit detailed technical documentation, pass third-party testing, and maintain compliance with MNRE’s performance standards.

Why ALMM Exists

The ALMM was created to prevent low-quality, uncertified equipment from entering India’s solar supply chain under the cover of government-subsidy schemes. Before ALMM, the market saw a proliferation of sub-standard inverters (often relabelled Chinese products without genuine BIS certification or adequate warranty backup) being installed in subsidy-funded projects. ALMM creates a minimum quality threshold.

What ALMM Compliance Means for Homeowners

• Subsidy eligibility: Non-ALMM inverter = subsidy rejected. No exceptions.
• Quality floor: ALMM-listed inverters have passed BIS testing and MNRE technical scrutiny. You get a product that has been independently verified.
• Warranty enforcement: ALMM-listed manufacturers have submitted performance and warranty commitments to MNRE. This gives homeowners an additional layer of protection.
• Resale value: A home with an ALMM-documented solar system is easier to sell than one with unverifiable equipment.

How to Verify Before Installation

1. Go to mnre.gov.in/almm-list/ (or the PM Surya Ghar portal’s equipment search).
2. Search for the exact model name and wattage the installer is proposing.
3. Confirm the listing is active (some older listings expire; always check the current revision date).
4. Note the model number on the equipment delivered matches the ALMM listing before installation begins.

For more on why certifications matter beyond subsidy, read the solar inverter certifications guide on this blog.

Common Application Mistakes: and How to Avoid Them

The PM Surya Ghar portal logs millions of applications. DISCOM officers and scheme administrators report the same cluster of errors repeatedly. Here are the ones most likely to delay or deny your claim; if your claim has already been turned down, the PM Surya Ghar rejection reasons guide walks through how to appeal each scenario.

• Installing before DISCOM feasibility approval: The DISCOM must approve your application before physical installation begins. Installing first means the system may not qualify for commissioning under the scheme, and the subsidy is denied. Always wait for the green status on the portal.
• Using a non-empanelled vendor: Only vendors on the DISCOM’s empanelled list are eligible to execute PM Surya Ghar installations. Verify empanelment on the portal (not on business cards or social media). Schemes like “we handle everything” from unverified vendors should trigger immediate caution.
• Non-ALMM inverter or panels: The single most common cause of final-step claim rejection. Verify model numbers against the MNRE ALMM list yourself, not just from the vendor’s word.
• Sanctioned load mismatch: If the proposed system capacity exceeds your sanctioned load, the DISCOM rejects the technical feasibility. Apply for load enhancement first, or size the system within the existing sanctioned load.
• Bank account mismatch: The bank account submitted on the portal must match the account holder’s name exactly as it appears in the bank’s records. Discrepancies (for example, initials vs full name) cause disbursement failures.
• Missing the commissioning window: Some DISCOMs close the commissioning queue for certain periods due to staff constraints or budget cycles. Coordinate with your vendor on timing to avoid delays.
• Skipping the NACH mandate: The portal requires a signed NACH mandate even though the subsidy is a one-time credit. Skipping this step stalls disbursement.
• Uploading blurry or incomplete documents: Portal verification requires legible documents. Electricity bills must show the consumer number clearly. Property documents must be clear enough to read the survey or flat number.

For a broader look at inverter selection beyond just subsidy compliance, the solar inverter selection guide covers capacity sizing, MPPT configuration, and India-specific grid requirements.

Net Metering After Installation: Your Monthly Export Earnings

Once your PM Surya Ghar system is commissioned, the financial relationship with your DISCOM changes fundamentally. You move from being a pure electricity consumer to a prosumer, someone who both consumes and produces electricity.

Net metering is the billing mechanism that makes this work. Your bidirectional smart meter records:

• Import units: Power you drew from the grid (typically during mornings, evenings, and nights when your solar is not generating enough)
• Export units: Power you sent to the grid (typically during the midday solar peak when generation exceeds consumption)

At the end of each billing cycle, the DISCOM subtracts export units from import units. You pay only for the net difference, if any, plus fixed charges. In many cases (especially in summer months with long daylight hours) a well-sized system produces a credit that carries forward to the next month.

What Export Tariffs Look Like in 2026

Export (feed-in) tariffs vary by state and DISCOM, set by State Electricity Regulatory Commissions (SERCs). Most fall between ₹2.50 and ₹5 per unit exported. This is typically lower than the retail import tariff you pay, which is why self-consumption (using your own solar generation directly) is more valuable than exporting. Design your system and consumption behaviour to maximise self-consumption.

For a detailed state-by-state breakdown of net metering regulations, tariffs, and banking rules, refer to the net metering India complete guide, a companion post to this one.

The Free 300 Units Claim: What It Actually Means

The scheme’s “300 free units per month” headline is an approximation based on average generation from a 3 kW system under India’s solar irradiance conditions. Peak Sun Hours across India average 4.5–5.5 hours per day, giving a 3 kW system approximately 4,050–4,950 kWh per year, or 338–413 units per month.

Whether this translates to a zero bill depends on:

• Your monthly consumption: if you consume 200 units and generate 350, the surplus carries forward
• Fixed charges: DISCOMs levy a monthly fixed/demand charge that continues regardless of generation; this component does not go to zero
• Export tariff vs retail tariff gap: if export tariff is ₹3 and import tariff is ₹8, consuming solar directly saves more than exporting

For payback period calculations and a detailed financial model under different tariff and consumption scenarios, the solar inverter payback period guide walks through the complete maths.

CAPEX Model vs RESCO Model for PM Surya Ghar

PM Surya Ghar can be accessed through two fundamentally different financing structures. Understanding the difference before you sign anything is critical, they have very different implications for subsidy eligibility, ownership, and long-term returns.

The CAPEX model is strongly preferred for PM Surya Ghar because the central subsidy is designed for owner-installers. Under a RESCO arrangement, the subsidy technically belongs to whoever is the registered applicant, and in most RESCO contracts, that is the RESCO company, not the homeowner. Read the contract carefully before proceeding with any RESCO offer that claims to “pass on the subsidy to you.”

Pros of CAPEX:

• ✓ Full ₹78,000 subsidy lands in your account
• ✓ Full long-term savings (₹7–10 lakh over 25 years) accrue to you
• ✓ Asset adds value to the property
• ✓ No monthly fixed payment obligation

Cons of CAPEX:

• ✗ Requires upfront capital of ₹72,000–₹1,02,000 (after subsidy for a 3 kW system)
• ✗ Maintenance is your responsibility, choose a vendor with strong after-sales support
• ✗ Risk of poor vendor service if the installer goes out of business

Pros of RESCO:

• ✓ Zero or near-zero upfront cost
• ✓ Maintenance and monitoring handled by RESCO
• ✓ Electricity savings from day one without capital outlay

Cons of RESCO:

• ✗ Central subsidy of ₹78,000 typically does not reach the homeowner
• ✗ Long-term contracts lock you in for 15–25 years
• ✗ If RESCO goes bankrupt, you may have an orphaned system on your roof
• ✗ Returns are significantly lower than CAPEX ownership

For homeowners who need financing assistance for the CAPEX route, the inverter financing options guide covers MNRE’s bank partnership programme, which offers concessional home loans for PM Surya Ghar applicants through SBI, Canara Bank, PNB, and Bank of Baroda at subsidised interest rates. Before picking a lender, it’s worth comparing rates side by side in the best bank for a solar loan guide, since IREDA, SBI, and HDFC differ meaningfully on tenure and processing time.

For Installers: Quoting PM Surya Ghar Projects Accurately

If you are on the installing side of this scheme rather than the buying side, the subsidy math is where quotes go wrong. The ₹78,000 cap, the slab structure, and the DISCOM-specific net metering rules all have to land in the customer’s payback figure correctly, and a spreadsheet that has not been updated since the last slab revision will quietly overstate the return.

Design platforms that ship an Indian tariff and subsidy library handle this at design time instead. Our solar design software India comparison covers which tools carry IS code libraries, the ALMM module database, INR pricing, and PM Surya Ghar subsidy auto-calculation, and which ones expect you to bolt that on yourself.

Where Qbits Fits in PM Surya Ghar

Qbits Energy inverters are ALMM-listed, which means every Qbits on-grid and hybrid inverter qualifies your PM Surya Ghar installation for the full ₹78,000 central subsidy. Beyond subsidy eligibility, Qbits products are built specifically for Indian grid and weather conditions: they handle the 180–270 V voltage fluctuations common in Tier-2 and Tier-3 DISCOM areas, carry IP66 weather protection for monsoon durability, and come with a 12-year full replacement warranty, more than double the five-year minimum the scheme mandates.

The 12-year warranty matters for a PM Surya Ghar installation in a specific way: the system is supposed to run for 25 years. If your inverter fails in year seven and you are dealing with a brand that has a five-year warranty and slow service, you either pay for a replacement or lose generation. Qbits backs every inverter with a sub-72-hour RMA SLA through a network of authorised service partners across India.

Three pages worth bookmarking when you are evaluating Qbits for a PM Surya Ghar installation:

• On-Grid Inverters: The TLS and TLD series from 1.5 kW to 50 kW are the natural fit for PM Surya Ghar’s subsidised 1–3 kW residential segment. ALMM-listed, BIS-certified, and grid-tuned for every major Indian DISCOM.
• Hybrid Inverters: The HS and HT series add battery-readiness for homeowners who want backup power alongside the subsidy benefit. ALMM-listed in grid-tie mode.
• Residential Solutions: A complete system view covering panel, inverter, mounting, and monitoring, packaged for the residential PM Surya Ghar use case.
• Why Qbits: The full case for choosing an Indian-made, Indian-warranted inverter for a 25-year installation.

When you are ready to confirm which Qbits model suits your roof size, sanctioned load, and state DISCOM requirements, talk to a Qbits engineer. Most site assessments and system recommendations are returned within 24 hours, and if your installer has already quoted a system, the team can review the design and verify ALMM compliance before you commit.

“Built in India, backed in India, so when something goes wrong on a Tuesday afternoon, someone actually picks up the phone.”

PM Surya Ghar Progress in 2026: Where the Scheme Stands

PM Surya Ghar crossed 1 crore (10 million) registrations on the national portal by early 2026, matching the scheme’s target number of registered applicants. However, registrations are not the same as commissioned installations. As of Q1 2026, actual commissioned installations under the scheme stand at approximately 30–35 lakh (3.0–3.5 million) households, according to Mercom India tracking of MNRE data.

The gap between registrations and commissions reflects several bottlenecks:

• Smart meter shortage: The transition from conventional meters to bidirectional smart meters is the most cited bottleneck. Several states have smart meter procurement gaps, delaying commissioning even when panels and inverters are installed.
• DISCOM capacity constraints: Engineering inspection teams in smaller districts are understaffed relative to application volumes.
• Vendor empanelment gaps: In Tier-3 and Tier-4 towns, the number of empanelled vendors is still thin, creating geographic access problems.
• Consumer education gaps: Many applicants who registered have not completed the application or selected a vendor, often due to uncertainty about the process.

Despite these challenges, India’s residential rooftop solar market reached approximately 5 GW cumulative capacity by end of 2025, with PM Surya Ghar driving the largest single-year addition in FY2025, according to JMK Research. The CEA electricity data confirms the distributed generation contribution from rooftop solar is now measurable in several state grids.

The Central Government extended the scheme deadline from its original March 2026 target to March 2027 to allow states to catch up on smart meter and DISCOM readiness. The ₹75,000 crore budget allocation remains intact.

States Leading Installations

Gujarat continues to lead nationally, driven by high retail tariffs, strong GEDA (Gujarat Energy Development Agency) implementation, and combined central-plus-state subsidies. Maharashtra, Rajasthan, and Andhra Pradesh follow. Uttar Pradesh has seen significant growth in FY2025–26 after DISCOM restructuring improved application processing speed.

For homeowners in states with lower installation rates, this is actually an advantage: shorter queues, faster DISCOM processing, and less competition for empanelled vendor slots.

How to Choose the Right System Size Under PM Surya Ghar

Choosing the right system size is more nuanced than simply picking the maximum subsidised 3 kW. The optimal size depends on your actual consumption, sanctioned load, roof area, and budget.

A Simple Sizing Framework

1. Find your average monthly consumption: Look at the last 12 months of electricity bills. Take the average monthly units consumed.
2. Apply a solar fraction target: Most homeowners aim to offset 80–100% of consumption. Divide average monthly units by 120 (approximate units per kW per month in median Indian conditions) to get the kW capacity needed.
3. Check against sanctioned load: Your system should not exceed your sanctioned load. If the calculation suggests 4 kW but your sanctioned load is 3 kW, you either resize or apply for load enhancement.
4. Check roof area: Each kW of solar requires approximately 8–10 square metres of shadow-free south-facing roof. A 3 kW system needs 24–30 sq m.
5. Confirm subsidy alignment: If your calculation gives 2–3 kW, you receive maximum subsidy. If it gives 1 kW, size up to 2 kW if your budget and roof allow, since the per-unit economics improve with size.

For a more detailed technical sizing exercise (including string configuration, MPPT channel requirements, and DC oversizing ratios) the solar inverter sizing guide on this blog covers the engineering side.

A well-sized system is also the most reliable. Oversized systems that export most of their generation earn lower returns due to export tariff gaps. Undersized systems underperform against the subsidy opportunity. Getting sizing right before applying saves months of rework.

For homeowners interested in the complete regulatory and compliance picture around inverter quality, the solar inverter regulations India 2026 guide explains how BIS, IEC, and MNRE compliance stack together, and how to verify an inverter before purchase.

PM Surya Ghar Muft Bijli Yojana is, by any measure, the most significant financial incentive for residential solar in India’s history. The numbers are genuine: ₹78,000 in your account, 300 units of generation per month, a 2–3 year payback, and 25 years of largely self-sufficient electricity. The complexity is manageable if you follow the five steps in the correct sequence, verify ALMM compliance before installation begins, and choose an inverter brand with the warranty depth and service network to last the full 25 years.

The subsidy is time-bound. The scheme runs to March 2027. The opportunity to claim it closes when either the budget is exhausted or the deadline passes. For homeowners who have been watching and waiting, the most expensive decision is continuing to delay.