FININ2MIN · BUSINESS PLAYBOOKS · PCJ-17
Rooftop Solar EPC & Installer
Practical India guide to Rooftop Solar EPC & Installer: approvals, setup, operating controls, taxes, cash flow, risks, closure, 28 FAQs and editable tools.
General business education. Use the activity, location and transaction facts for legal and tax decisions; illustrative figures are not promised returns.
The two-minute answer
First decision — Residential PM Surya Ghar consumer. Check national portal/vendor, beneficiary and DISCOM registration, domestic-content and commissioning conditions before quoting subsidy. Second decision — Commercial factory rooftop. Residential subsidy cannot be assumed; evaluate C&I tariff, transformer limits, roof ownership and DISCOM regulations. Then execute — Survey the site and system objective. Measure roof condition, shadow, structural loading, tariff category, meter/distribution configuration, sanctioned load, cable routing and client ownership before preparing generation estimates. Know the first escalation — Roof leakage after installation. Inspect penetrations and waterproofing, preserve installation photos, warranty and contractor handover, and repair safety hazards promptly. Save a dated licence/authority determination, responsible owner, signed contract, evidence reference and next review date at every material step. This is the minimum practical answer before committing capital or promising a customer outcome.
Choose your exact model before applying
| Operating model | How it changes compliance | Minimum evidence |
|---|---|---|
| Residential scheme installer | PM Surya Ghar vendor and subsidy/interconnection procedures apply where scheme benefits claimed. | Vendor status, beneficiary application and DISCOM process |
| Commercial/industrial EPC | Project-specific design, roof rights, electricity regulations and commercial tax terms. | EPC contract, electrical design, utility NOC |
| O&M contractor | Performance guarantee, maintenance access and electrical safety during operation. | Service SLA, maintenance and warranty logs |
Six practical steps — registration to operation
Survey the site and roof authority
Confirm building ownership, access, load-bearing structural capacity, shading, waterproofing, fire access, applicable building/bylaw and electrical network condition. A satellite/phone photo cannot replace a safe roof survey and professional engineering where needed.
Validate project and scheme eligibility
For PM Surya Ghar residential work, check the active MNRE portal/vendor process and DISCOM conditions, beneficiary eligibility, empanelled installer rules, product eligibility and subsidy procedure. Never promise a fixed subsidy if the actual application, commissioning or scheme criteria are unverified.
Engineer safe electrical design
Specify DC/AC capacity, module/inverter model, earthing, isolators, surge protection, cable routing, roof anchors, fire separation, workmanship inspections and grid synchronization. Follow applicable CEA electricity safety regulations and State electrical inspector/utility rules.
Contract procurement and warranty
Distinguish equipment purchase from installation/works contract, customer variations, roof repairs, weather delay, payment milestones, insurance, inverter warranty, module performance warranty and after-sales service. Keep serial numbers and batch documentation.
Complete utility/testing/commissioning
Follow DISCOM application and interconnection/meter rules, electrical testing, installation photos, handover and authorised commissioning. Capture test results, as-built schematic, emergency shutdown instructions and O&M checklist in the customer dossier.
Review GST and lifetime savings carefully
Equipment, EPC works/combined supplies and O&M may have different tax classification; avoid copying an older single solar rate. Model generation degradation, grid tariff, self-consumption, inverter replacement, EMI cost and realistic outages rather than “100% free electricity”.
Regulatory applicability and authority matrix
| Statute / regulator | What triggers it | What to verify | Keep on file |
|---|---|---|---|
| MNRE PM Surya Ghar scheme | Scheme beneficiary/vendor/subsidy processes where invoked. | Verify official vendor approval and project stage. | Portal status, application, commissioning |
| CEA electrical safety and DISCOM rules | Grid-connected electrical installations. | Use competent signoff, testing and utility conditions. | Single-line diagram, safety and meter certificates |
| BIS/QCO/product standards | Modules, inverters and related regulated products. | Check equipment eligibility and documentation. | Test and product certificate |
| GST and contract law | Supply of goods versus EPC/works/O&M contracts. | Analyse actual transaction and notification effective date. | Contracts, HSN/SAC, invoices |
GST, income tax and cash-recognition decisions
| Transaction / obligation | Assessment and treatment |
|---|---|
| Solar modules/inverters | Product classification and current notified rates require specific verification. |
| Installed project/EPC | Works/composite service rules may not mirror equipment-only GST. |
| Maintenance | Treat recurring O&M contracts separately. |
| Depreciation and project economics | Asset owner and tax position determine income-tax/depreciation treatment. |
Forms, registers and evidence checklist
| Document / record | What to include | Owner / authority |
|---|---|---|
| Survey | Structural, roof access and electrical site report | Engineering file |
| MNRE/DISCOM | Beneficiary and vendor eligibility, interconnection and meter | Scheme/utility file |
| Safety | Electrical tests, earthing, fire access, shutdown SOP | Commissioning pack |
| Equipment | BIS/model certificates, serials and warranties | Procurement |
| Tax/finance | EPC invoice classifications and generation assumptions | Project MIS |
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Financial model: revenue, profit and cash are different
| Input or result | Value | Meaning |
|---|---|---|
| Monthly volume | 320 accepted installed kW | Retained, accepted or billable output—not merely enquiries/dispatches |
| Realised price | ₹47,000 | Net of refunds and indirect tax |
| Variable cost per unit | ₹37,000 | Direct cash costs allocated to the same billable unit |
| Fixed operating cash cost | ₹1,450,000 | Excludes depreciation, finance charges and income tax |
| Contribution per unit | ₹10,000 | Price minus variable unit cost |
| Break-even volume | 145 accepted installed kW | Fixed cost ÷ contribution, rounded up |
| Capacity utilisation | 64.0% | Volume ÷ illustrative safe/saleable capacity |
Worked calculation: 320 × (₹47,000 − ₹37,000) = ₹3,200,000 contribution; less ₹1,450,000 fixed cash costs leaves ₹1,750,000 before financing, depreciation, tax and capital expenditure. A 10% fall in volume alone reduces contribution by ₹320,000. A 10% rise in unit variable cost alone reduces it by ₹1,184,000.
A rooftop quote must distinguish installed capacity from delivered scope
An EPC customer compares two per-kW quotes. One omits structural work, metering, connection steps and maintenance access; the other assumes a subsidy payment before commissioning and customer eligibility are established.
Work through the decision
Break the quotation into equipment, design, structural/electrical works, protection, metering, interconnection, testing, handover and service. Confirm site rights, roof condition and DISCOM requirements. Match any scheme participation to the actual vendor, customer and installation conditions rather than reducing the price by an unconfirmed incentive.
What to establish before proceeding
Fund the contract without an assumed subsidy receipt. Make milestones contingent on measurable work and authority/customer acceptance. Retain component serials, test results, warranties, commissioning evidence and a responsibility split for roof leaks, generation claims and grid downtime.
| Operating measure | Definition and use |
|---|---|
| Accepted-installation contribution | Contract income earned against accepted milestones less equipment, installation and rectification costs. |
| Unbilled/retained cash | Work completed but not yet certified, invoiced or released from retention. |
| Defect callback cost | Travel, labour and parts used for callbacks tracked against the responsible installation and component. |
This example is Finin2min’s operating analysis. Its commercial assumptions are not quoted market terms or a permit determination.
Common mistakes and how to avoid them
- Promises of guaranteed subsidy. Scheme-specific approvals and timing determine benefits.
- Roof load unverified. Structural failure creates major safety and liability exposure.
- Mixing equipment and EPC GST blindly. Classification varies by contract and notifications.
- No post-install service commitment. Warranties and maintenance affect long-term savings.
Practical 30/60/90-day implementation plan
| Period | Specific milestone |
|---|---|
| Days 1–30 | Survey the roof and electrical connection; define the EPC and scheme-participation scope before quoting. |
| Days 31–60 | Confirm component supply, installer competence, milestone payments and the interconnection route. |
| Days 61–90 | Close commissioning and handover records, monitor defects and collect retention before committing the next installation. |
Your launch readiness checklist
0 of 10 launch tasks marked done (this page only)
Which business model changes the legal answer?
| Situation | Exact action and proof of decision |
|---|---|
| Residential PM Surya Ghar consumer | Check national portal/vendor, beneficiary and DISCOM registration, domestic-content and commissioning conditions before quoting subsidy. |
| Commercial factory rooftop | Residential subsidy cannot be assumed; evaluate C&I tariff, transformer limits, roof ownership and DISCOM regulations. |
| Housing society rooftop | Assess common loads, society approvals, metering configuration, roof rights and scheme-specific eligibility. |
| Government tender project | Contract tender technical criteria, component certifications, bid security and procurement laws can differ from retail residential installation. |
| Battery/hybrid installation | Fire, electrical and waste/battery producer obligations may be additional to grid-tied PV requirements. |
| Roof under third-party lease | Obtain enforceable rooftop use, waterproofing, access, liability, roof restoration and power sale arrangements. |
Complete execution SOP: what to do, in order
Survey the site and system objective
Measure roof condition, shadow, structural loading, tariff category, meter/distribution configuration, sanctioned load, cable routing and client ownership before preparing generation estimates.
Check DISCOM and subsidy eligibility
Distinguish residential PM Surya Ghar, C&I rooftop, group housing, open access and off-grid sites. Review MNRE and State/DISCOM scheme and vendor empanelment rules; subsidy is not a blanket EPC seller benefit.
Select compliant components and designs
Validate applicable module/inverter standards, ALMM and domestic-content rules where scheme mandates, earthing, surge/lightning protection, grid code and fire/electrical approvals.
Issue an auditable proposal and EPC contract
Specify kWp DC and kW AC, design output assumptions, shadow losses, warranties, performance exclusions, structural liability, taxes, DISCOM applications, milestones and after-sales SLAs.
Install, test and commission safely
Use competent electrical workforce, fall-protection, isolation/lockout, polarity and insulation tests, protective equipment, as-built single-line diagram and commissioning checklist; get required DISCOM/inspection clearances.
Complete net-metering, handover and claim process
File customer/DISCOM documents, meter commissioning, portal updates, completion certificate and subsidy application where eligible. Maintain serial numbers, vendor warranty and final acceptance.
Monitor energy generation and O&M
Track actual kWh versus weather-adjusted assumptions, inverter outages, leakage/earthing inspections, cleaning plans, complaint close and annual warranty claims.
What to do when something goes wrong
| Real-world problem | Action, evidence and remedy |
|---|---|
| Roof leakage after installation | Inspect penetrations and waterproofing, preserve installation photos, warranty and contractor handover, and repair safety hazards promptly. |
| Subsidy not credited | Check beneficiary and portal application, vendor empanelment, DISCOM inspection/net-metering and payment status; communicate only confirmed entitlement. |
| Inverter electrical fault | Isolate safely through trained personnel, inspect grid voltage/protection and warranty terms and test before reconnection. |
| Generation below sales projection | Compare model irradiation/shading, measured weather, downtime, soiling and warranty performance criteria; document diagnosis and customer remedy. |
| Fall or electrocution incident | Activate emergency response, preserve worksite and legal reporting evidence, review contractor safety and secure work stoppage as needed. |
Contract clauses and counterparty safeguards
- State subsidy and DISCOM eligibility as conditions, not guaranteed payments
- Disclose generation estimate, shadow assumptions, DC/AC capacity and degradation
- Define waterproofing, structural and site access responsibilities
- Allocate mandatory component certifications and electrician qualification
- Specify commissioning acceptance, warranty, after-sales uptime and O&M
Operational templates, registers and checklists
- Licence/approval applicability and filing tracker (CSV)
- Business-specific operational register (CSV)
- Incident response and corrective actions (CSV)
- Commercial terms and contract negotiation checklist (CSV)
- 12-month compliance review calendar (CSV)
- Question/answer and evidence bank (CSV)
- Official forms and documents vault index (CSV)
Stress tests, funding and month-end finance
| Stress / funding item | Illustrative result | Decision |
|---|---|---|
| Volume −20% and unit cost +10% | ₹162,800 monthly operating result | Reduce avoidable fixed costs, reprice or improve retained volume before adding debt |
| An extra 30 days of collection delay | ₹15,040,000 additional receivables | Profit is unchanged initially, but cash is locked up |
| Startup equipment cash | ₹2,500,000 | Separate capital expenditure from operating cost |
| Refundable lease deposit | ₹500,000 | Not an ordinary monthly expense |
| Opening liquidity buffer | ₹3,500,000 | A planning assumption—not proof the business is adequately funded |
Financing decision
Law, effective date and applicable authority
Direct tax: use the correct year and law
Official reading: CBDT — Income-tax Act, 2025 commencement
Labour: commencement and operating rules are separate checks
Official reading: Ministry of Labour — four Labour Codes commencement
GST: classification, notification and date
Official reading: CBIC tax-information repository · Ministry of Finance — 56th GST Council FAQ
Personal data: staged commencement
Official reading: Gazette — DPDP Act phased commencement, G.S.R. 843(E)
Commercial and legal decisions before spending
Separate equipment supply, EPC and long-term generation
Selling modules, supplying and installing a rooftop system, operating a RESCO project and providing O&M have different revenue and risk profiles. The sample model is an EPC installation business, not a project-finance model for owning generation assets. Establish who owns the plant, obtains connection approval, receives the subsidy, bears roof risk and signs the O&M obligation.
Do a site feasibility file before quoting output
Record roof ownership/consent, usable area, shading, structural assessment, sanctioned load, consumption profile, connection category, cable route and access. Explain that savings depend on actual generation, self-consumption, tariff and export-credit arrangements. Do not guarantee a subsidy, net-metering approval or a particular monthly bill from panel capacity alone.
Make milestone cash match procurement
Module/inverter purchases, installation payroll and bank guarantees can precede customer acceptance and final payment. Specify advance, material delivery, installation, commissioning and retention milestones with objective evidence. Include warranty/service reserves and rework. A subsidy expected by the customer is not the installer’s cash until the contract and actual payment establish entitlement.
Control quality, commissioning and handover
Use compliant equipment for the relevant scheme/product requirements, verified installers and safe electrical/working-at-height practices. Record serial numbers, test results, protection settings, commissioning approvals and user training. Hand over warranties, as-built drawings, shutdown instructions and O&M responsibilities. A photographed installation is not proof of an energised, approved and performing system.
Official reading: MNRE — PM-Surya Ghar vendor-registration process · BIS — products under compulsory certification · National Single Window System — Know Your Approvals and State portals · CBIC tax-information repository · Ministry of Labour — four Labour Codes commencement
Approvals: authority, process and completion evidence
Scheme vendor status
Authority: MNRE / national portal / DISCOM
Process: Check the applicable scheme’s vendor-registration process and current conditions; complete the required undertaking/security and portal steps where applicable.
Completion evidence: Vendor approval/status and scheme-specific compliance evidence.
Electrical work and interconnection
Authority: Competent State electrical authority / DISCOM
Process: Confirm installer/contractor eligibility, feasibility, connection/net-metering procedure, testing and energisation approval for the site.
Completion evidence: Applicable licences, application, technical approval, meter/commissioning records.
Equipment eligibility
Authority: BIS / MNRE / scheme authority
Process: Match modules, inverters and other equipment to applicable certification and scheme eligibility, including product/manufacturer lists where required.
Completion evidence: Scope-matched certificates, invoices, serial numbers and approved bill of materials.
Roof and customer contract
Authority: Owner / society / technical professionals
Process: Obtain roof rights and structural/safety assessment; agree generation assumptions, warranties, access, water/leakage, payment and O&M allocation.
Completion evidence: Consent, survey/design, signed scope and milestone/acceptance records.
Application passport: from eligibility to approval
Permissions, prescribed forms, fees and professional review
Scheme vendor status
Facts that determine applicability: Identify whether installations are sold under PM-Surya Ghar or outside the scheme.
Competent authority: MNRE scheme / relevant DISCOM
Application and prescribed form: Follow the applicable vendor-registration route and scheme conditions; registration alone does not authorise every electrical activity.
Fees and funding: Separate any scheme security/deposit, contractor charges, connection/meter fees and customer price.
Completion evidence: Vendor status, scheme eligibility, customer consent, installation documentation and scheme milestones.
Question for the relevant professional: Does the customer/project qualify and who is responsible for each scheme obligation?
Electrical and grid permissions
Facts that determine applicability: Identify voltage, capacity, site, contractor role and grid/export arrangement.
Competent authority: State electrical licensing/inspection authority and DISCOM
Application and prescribed form: Obtain the actual contractor, safety and interconnection applications applicable to the project.
Fees and funding: DISCOM and inspection fee schedules depend on project/jurisdiction; do not invent a nationwide net-metering fee.
Completion evidence: Electrical eligibility, designs, approvals, inspection, meter/interconnection and commissioning evidence.
Question for the relevant professional: Are the design, installer qualifications and grid connection lawful for this installation?
Products, warranty and claims
Facts that determine applicability: Identify panels, inverters, batteries and actual manufacturer/model.
Competent authority: BIS and other relevant product authorities; consumer authorities
Application and prescribed form: Check applicable certification and scheme product requirements against the actual model and supplier documents.
Fees and funding: Product compliance/testing, warranty reserves and statutory fees are different cost categories.
Completion evidence: Product certificates, invoices, serial numbers, performance assumptions, warranty and handover.
Question for the relevant professional: Are product approvals and advertised savings/warranties supported for this actual system?
Prepare the decision file
Daily controls, review rhythm and escalation
Per site: roof/connection feasibility, equipment eligibility, worker safety, delivery serial numbers and test evidence.
Weekly: procurement commitments, milestone collections, delayed DISCOM approvals, installation capacity and rework.
Monthly: project contribution, retention ageing, warranty reserve, supplier claims and cash under commissioning delays.
Respond to an incident without destroying evidence
Exit, sale, closure and continuing liabilities
Close outstanding installations, warranties and customer advances through an explicit servicing arrangement. Transfer project records and contact routes, handle vendor-registration/security obligations and release customer roof/equipment rights only through lawful documents. Leaving the market does not remove an existing warranty or safety responsibility.
Closing evidence and liabilities
Business-specific questions answered
Does PM Surya Ghar vendor status authorise all electrical work?
No. Scheme status and professional/utility/electrical permissions are distinct.
Will every rooftop customer receive the subsidy?
No. Eligibility and milestone requirements must be met.
Can I promise zero power bills?
Generation, weather, tariff, self-consumption and fixed charges make that unsafe as a universal claim.
What should the handover pack contain?
As-built drawings, serials, testing, utility approvals, warranties and shutdown instructions.
The answers below address common real-world situations. Each must still be matched to the operator’s actual facts, current tax notification and State/local rules.
Does every rooftop solar customer receive a subsidy?
No. Scheme, beneficiary, capacity, DISCOM, vendor and component criteria determine eligibility. Commercial/industrial customers must not be promised residential assistance.
Can a contractor claim subsidy in its own bank account?
Follow scheme beneficiary/disbursement rules and official portal; do not describe customer subsidy as installer income unless lawful contract and programme explicitly permit.
Can any electrician legally install a net-metered system?
Check local electrical licensing, safety and DISCOM empanelment requirements; competent installation is necessary and vendor eligibility can be programme-specific.
Is 5 kW of panels always 5 kW AC?
No. PV module DC capacity and inverter/grid AC capacity differ; quote both and expected annual kWh with assumptions.
Is net metering universal throughout India?
No. State Electricity Regulatory Commission and DISCOM regulations govern capacity, eligibility, settlement and tariffs.
Who is responsible if the roof leaks?
EPC contract should allocate survey, existing waterproofing, penetrations, remediation and warranties with before/after photos.
Is solar electricity always free after installation?
Bills may include fixed charges, grid imports, tariff changes and financing/O&M. Estimate savings from actual tariff and consumption profile.
Can I promise a specific number of units every year?
Only within a transparent model with irradiation, shading, degradation, equipment downtime and weather assumptions; distinguish estimate from guaranteed output.
Do imported inverters need product compliance?
Check BIS/QCO/technical and customs requirements applicable to exact inverter model and current scheme; preserve certificates and serial numbers.
Does EPC supply have one fixed GST rate?
Classification of equipment, composite works contract, supply plus installation and current notifications matters; do not apply an old blanket rate.
What should the customer receive at handover?
As-built design, serial and warranties, test sheet, electrical safety records, DISCOM/portal approval, O&M guide, contacts and commissioned generation baseline.
How should O&M revenue be budgeted?
Separate one-time EPC contribution from service contracts, warranty reserves, call-out labour and replacement costs over the installation life.
Is PM-Surya Ghar vendor registration enough to energise any installation?
No. Scheme participation and site-specific electrical/connection approval are different. Complete the applicable State electrical and DISCOM process and obtain the required testing/commissioning evidence before energisation.
Can I promise the customer that subsidy will definitely arrive?
Do not guarantee an authority-controlled benefit without a valid basis. Explain eligibility, application, technical conditions and the recipient/payment route; separate the customer’s potential benefit from your contractual fee and cash forecast.
Is a 5 kW system a guarantee of a fixed monthly saving?
No. Generation and savings depend on site shading, orientation, weather, system performance, consumption timing and tariff/export rules. Use clearly stated assumptions and a sensitivity range rather than a universal rupee promise.
How should an EPC quote handle roof defects?
Define survey scope, structural review, roof preparation, waterproofing, access and responsibility for pre-existing defects and installation damage. Do not treat a generic owner consent as technical proof that the roof can safely support the system.
What is the financial model’s unit?
Accepted installed kW for an EPC service business, with a net contract realisation and direct project cost per kW. It excludes the separate economics of owning generation assets; use a project-finance model for RESCO or asset ownership.
When should installation revenue be recognised?
Apply the contract and accounting standards to the actual performance/acceptance milestones. Keep unbilled work, customer advances and retention separate. A module delivery or customer subsidy application does not automatically mean the full EPC contract is complete.
How should warranty cost be budgeted?
Estimate service visits, replacement logistics, labour and unrecoverable supplier claims based on evidence and contract scope. Keep manufacturer warranty separate from the installer’s obligations and stress-test supplier failure rather than assuming all claims are fully reimbursed.
Can I substitute a cheaper module after the customer signs?
Only through a documented change that preserves applicable technical/scheme compliance and customer approval. Confirm certification, performance, warranty and design compatibility; do not silently substitute a different model on the bill of materials.
Why can a profitable EPC firm run out of cash?
Procurement and installation payments may precede commissioning, retention release and customer collection. Model milestone timing and delayed approvals, not only the final contract margin. Maintain a cash reserve for rework and warranty calls.
Does one GST rate apply to every solar transaction?
No blanket answer covers equipment-only sale, installation, composite EPC, works contract and O&M. Determine the actual supply and applicable notified valuation/rate conditions; do not automatically apply a remembered equipment rate to the whole contract.
What should a commissioning handover include?
Approved design/as-built record, equipment serials, test/commissioning documents, meter details, warranties, safety shutdown, monitoring access, O&M schedule and escalation contacts. Obtain customer acknowledgement of the actual delivered scope.
What is the key expansion risk?
Taking too many deposits without the installation capacity, compliant equipment and cash to complete sites. Monitor signed backlog by approval status and procurement commitment, and avoid using new-customer advances to conceal overdue old installations.
State/UT and city-level applicability test
- Is the chosen premises permitted for this exact business and capacity?
- Which State, city and sector permit applies to each activity and each operating location?
- Are there fire, building, waste, signage, labour or medical safety conditions for this site?
- Do thresholds, professional qualifications, inspection dates or renewals differ here?
- Has any 2026 amendment commenced, been notified or changed the relevant form/fee?
- Who is legally responsible for each filing, complaint, accident and customer refund?
What to check when a law or business model changes
Official sources and prescribed-form routes
Use the instrument applicable to the actual activity, jurisdiction and date. A directory is a route to the competent authority, not an individual licence determination.
MNRE — PM-Surya Ghar vendor-registration process
Scheme vendor registration is distinct from electrical-contractor eligibility and DISCOM interconnection.
BIS — products under compulsory certification
QCO, effective date, product scope and certification scheme must match the actual SKU and manufacturing site.
National Single Window System — Know Your Approvals and State portals
Navigation framework; not a substitute for municipal or sector permissions.
GST Council — official Central GST repository routes
Choose the exact operative Act, rule, classification and dated notification; a directory or Council recommendation is not the tax entry itself.
Ministry of Labour — four Labour Codes commencement
21 November 2025 commencement; applicable Central/State rules and transition must be considered.
CBDT — Income-tax Act, 2025 commencement
Act effective 1 April 2026; Rules notified 20 March 2026. Match the tax year before using earlier section/form numbers.
Gazette — DPDP Act phased commencement, G.S.R. 843(E)
13 November 2025; immediate, one-year and eighteen-month provision groups. Do not treat every substantive duty as already commenced.
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