PM Surya Ghar
For eligible residential grid-connected rooftop systems through the national portal and DISCOM process.
- ₹30,000/kW for the first 2 kW
- ₹18,000/kW for the next 1 kW
- ₹78,000 maximum central CFA above 3 kW
SOLAR ENGINEERING · INDIAPlan the right solar system.
Plan the right solar system.
Before you invest.
Independent planning tools, official-scheme guidance and engineering support for homes, businesses, industries and agriculture.
ABOUT SPECTRA ENERGY SERVICES
Engineering energy solutions with clarity and confidence.
Talk to our engineering team →Spectra Energy Services is an ISO 9001:2015 certified engineering and energy-solutions company based in Coimbatore, Tamil Nadu. We support residential, commercial, industrial and agricultural customers with practical solar power solutions, electrical products and value-added technical guidance.
Our team combines more than 18 years of engineering experience with India-wide and APAC product support. From on-grid, off-grid and hybrid solar systems to batteries, UPS systems, protection devices and electrical infrastructure, we help customers evaluate capacity, safety, lifecycle cost and long-term performance before making an investment.
18+ yearsEngineering experienceIndia + APACSupply and supportCoimbatoreLocal expertise, wider reach
01 / ENGINEERING TOOLKIT
Solar & Electrical Calculator Hub
Size solar arrays, batteries, solar water heaters, diesel generators, voltage stabilizers, AC/DC breakers and cables. Every result includes assumptions, formulas, print-ready output and a direct technical-verification request.
On-gridOff-gridHybridUPSBattery sizingPanel quantityRooftop areaGenerationPaybackDC cableAC cableSolar water heaterDiesel generatorAC breakerDC breakerVoltage stabilizerOfficial TNPDCL solar calculator
Open 16 calculators + official TNPDCL tool →02 / SOLAR SUBSIDIES & GOVERNMENT SCHEMES
Find the correct route for your category
Last verified: 15 August 2026. Scheme windows, eligibility, tariffs and state rules can change; always confirm on the official portal and with the relevant DISCOM.
Common facilities
Eligible group-housing societies and RWAs can review the official CFA route for common-facility supply, including EV charging, subject to portal capacity limits and conditions.
Check current GHS/RWA rules ↗PM-KUSUM
Component A supports decentralised plants; B covers stand-alone solar pumps; C covers pump/feeder solarisation. Central and state support depends on the component and location.
Official PM-KUSUM portal ↗Economic routes, not household CFA
Assess state metering, captive/open-access structures, RESCO/OPEX, finance and applicable tax treatment. Obtain regulatory and tax advice for the current project year.
MNRE solar resources ↗TNPDCL rooftop process
Domestic and non-domestic routes differ. Check the prevailing TNPDCL portal for CFA/non-CFA applications, metering methodology, vendor and inspection requirements.
TN rooftop portal ↗Net, gross & net-feed-in
The applicable settlement method depends on state regulations, consumer category, voltage and capacity. Never assume exported units are credited at the retail tariff.
MNRE rooftop programme ↗No subsidy guarantee: Spectra Energy Services cannot guarantee eligibility, approval, amount, inspection outcome or disbursement. Government authorities and DISCOMs control the process.
03 / SOLAR KNOWLEDGE CENTRE
On-grid, off-grid or hybrid?
On-grid
ANIMATED SINGLE-LINE DIAGRAM Power flow
- Grid dependent
- Battery normally not required
- No standard outage backup
- Possible export subject to rules
- Best for bill reduction
Off-grid
ANIMATED SINGLE-LINE DIAGRAM Power flow
- No grid required
- Battery essential
- Designed backup availability
- No grid export
- Remote sites and unreliable supply
Hybrid
ANIMATED SINGLE-LINE DIAGRAM Power flow
- Grid + solar + battery
- Higher initial cost
- Critical-load backup
- Export depends on approval
- Homes/businesses needing resilience
How solar panels work
Understand solar cells, DC generation, inverters and the factors that control rooftop energy output.
Read complete guide →Mono PERC, TOPCon & bifacial modules
Compare efficiency, temperature behaviour, roof utilisation, rear-side gain and warranty considerations.
Read complete guide →On-grid vs off-grid vs hybrid
Choose the right architecture for bill savings, independent power or critical-load backup in India.
Read complete guide →Solar inverter selection
Match inverter type, capacity, MPPT range, phase, protection and battery compatibility.
Read complete guide →String inverter vs microinverter
Compare central and module-level conversion for shade, roof complexity, monitoring and maintenance.
Read complete guide →Lithium vs lead-acid batteries
Evaluate usable energy, depth of discharge, cycle duty, efficiency, safety and lifetime cost.
Read complete guide →Generation and payback factors
Build realistic energy, savings and payback estimates from irradiation, losses and self-consumption.
Read complete guide →Net, gross and net-feed-in metering
Understand import, export and settlement concepts before evaluating rooftop solar economics.
Read complete guide →Cleaning and preventive maintenance
Protect output with safe cleaning, electrical inspection, structure checks and performance monitoring.
Read complete guide →Earthing, lightning & surge protection
Learn how bonding, lightning risk assessment and coordinated AC/DC SPDs improve solar safety.
Read complete guide →DC isolators, ACDB and DCDB
Select safe switching, combining, isolation and fault protection for solar AC and DC circuits.
Read complete guide →Solar cables and connectors
Size PV cables for ampacity and voltage drop and avoid unsafe connector compatibility mistakes.
Read complete guide →Common installation mistakes
Prevent shade, structural, string, cable, protection and commissioning problems.
Read complete guide →Questions to ask an installer
Use a practical checklist to compare solar quotations, equipment, warranties and service support.
Read complete guide →04 / PRODUCTS
Solar products for complete systems
No unverified prices, stock, warranties or delivery promises. Contact our team for confirmed technical and commercial details.
Solar panels
On-grid inverters
Off-grid inverters
Hybrid inverters
Lithium batteries
Tubular batteries
UPS systems
Solar cables
ACDB & DCDB
Solar protection devices
Mounting structures
Solar streetlights
Solar water heaters
Earthing & lightning protection
05 / OUR BRANDS
Trusted brands for solar and power solutions
Explore the solar, inverter, battery, cable, water-heating and power-equipment brands supported by Spectra Energy Services. Contact us for model selection, compatibility and commercial availability.
06 / SERVICES
From requirement to practical solution
Spectra combines product sourcing with value-added engineering to reduce avoidable CAPEX/OPEX decisions and improve system safety and maintainability.
Request a free consultation- ✓ Residential rooftop solar
- ✓ Commercial rooftop solar
- ✓ Industrial solar solutions
- ✓ Agricultural solar solutions
- ✓ On-grid, off-grid & hybrid design
- ✓ Energy-consumption analysis
- ✓ Battery-backup sizing
- ✓ Product supply across India
- ✓ Installation coordination
- ✓ Technical support
- ✓ AMC & maintenance enquiries
07 / FREQUENTLY ASKED QUESTIONS
Good questions before going solar
Divide the target array wattage by the selected panel wattage and round up. A 5 kW target using 550 Wp modules needs about 10 panels, subject to inverter string design.
08 / START A CONVERSATION
No. 6, JVV Shopping Complex, V. G. Rao Nagar, Athipalayam Pirivu, Ganapathy, Coimbatore – 641006, Tamil Nadu, India
GST: 33FNBPM5645A1ZC
Mobile No : 97915 55951
WhatsApp : 95006 55503
India: info@spectra-energy.in
APAC: info@spectraenergyservices.com
Send your requirement
Planning solar for your home or business? Send your city, electricity bill and backup requirement.
Spectra Energy ServicesNo. 6, JVV Shopping Complex, V. G. Rao Nagar, Athipalayam Pirivu, Ganapathy, Coimbatore – 641006, Tamil Nadu, India
GST: 33FNBPM5645A1ZC
Mobile No : 97915 55951
WhatsApp : 95006 55503
India: info@spectra-energy.in
APAC: info@spectraenergyservices.com