📋 Table of Contents
- Project Overview & Highlights
- Single-Phase vs Three-Phase — What It Means for Your Solar System
- Two Raised Arrays Over a Tiled-Roof Terrace
- Net Metering With BRPL Explained
- Real Savings — What This Home Now Earns
- What Thermosun Handled — Start to Finish
- Why Choose Thermosun
- Frequently Asked Questions
Ask most homeowners how big a solar system they need and they’ll answer in kilowatts. Very few ask the question that actually decides which equipment goes on the wall: is my house on a single-phase or a three-phase electricity connection? On 17 October 2026, Thermosun completed a 10kW rooftop solar installation at 210, Block C, Sarvodaya Enclave, a home with a three-phase supply, and it’s a good real example of why that detail shapes the whole solar system — from the inverter to the wiring in the AC box.
Project Overview & Highlights
This Sarvodaya Enclave installation spreads across two raised steel frames on a terrace with sloping tiled roof sections. Here’s exactly what was delivered:
Big House, Heavy Load, Three-Phase Supply?
Larger homes need a solar system designed around the connection, not just the roof. A free site survey from a solar installation company Delhi homeowners rely on starts with your electricity bill.
📞 Call Now 📄 Free Site SurveySingle-Phase vs Three-Phase — What It Means for Your Solar System
Most flats and smaller houses in Delhi run on a single-phase supply: one live wire plus a neutral. Larger houses, bungalows and homes with heavy loads — several ACs, pumps, a lift — often have a three-phase supply: three live wires plus a neutral, which spreads the load more evenly. The inverter on your roof has to match that.
🔌 Why It Matters for Your Solar Installation
- Matching the connection: a three-phase house is normally paired with a three-phase inverter, which delivers its output evenly across all three phases instead of loading just one.
- System size: single-phase inverters are typically used for smaller systems (commonly up to around 5kW), while larger systems like this 10kW installation generally call for a three-phase inverter. The exact limits are set by your DISCOM, so they’re confirmed at the survey stage.
- Different wiring and protection: a three-phase AC side uses a four-pole breaker and protection across all phases and the neutral — visible in the photo as the larger AC box on the right of the inverter.
In the inverter photo below, the cables entering the bottom of the AC box are the red, yellow and blue phase conductors plus the black neutral — the standard colour code for a three-phase connection. The inverter itself is a Sungrow three-phase unit with two separate DC inputs, which lets different sections of the array connect independently — useful when panels sit on more than one frame, as they do here.
Not sure which connection you have? Your electricity bill and the meter itself will show it, and if you’re unsure our team can confirm it from a photo of your bill before quoting anything. Getting this right at the start is what keeps a solar for home project from running into inverter-mismatch problems during DISCOM inspection.
Two Raised Arrays Over a Tiled-Roof Terrace
This property mixes sloping terracotta-tiled roof sections with a flat terrace at slightly different levels, plus a water tank and staircase access. Rather than squeezing everything onto one frame, Thermosun built two raised steel tables at different heights so each section of the array catches clear sun and the terrace stays accessible underneath. It’s the kind of layout work that rooftop solar installation Delhi homes with mixed roof levels need — a template wouldn’t have fitted this roof.
Net Metering With BRPL Explained
Sarvodaya Enclave falls under BSES Rajdhani Power Limited (BRPL). After commissioning, Thermosun filed the net metering application with BRPL, coordinated the inspection of the three-phase installation, and had the bi-directional meter installed. That meter records the units you draw from the grid and the surplus your system exports separately, and BRPL nets the two off at each billing cycle — the mechanism behind the monthly savings below.
Real Savings — What This Home Now Earns
With the array generating power and net metering active through BRPL, here’s the estimated monthly financial picture for this 10kW system. Actual figures depend on consumption, season and panel cleanliness:
| Benefit | Monthly Value | Annual Value |
|---|---|---|
| Bill Reduction via Net Metering | ₹9,000 – ₹12,000 | ₹1,08,000 – ₹1,44,000 |
| Delhi GBI (₹2/unit generated, 3–10kW slab) | ₹2,300 – ₹2,700 | ₹27,600 – ₹32,400 |
| Total Monthly Financial Benefit | ₹11,300 – ₹14,700 | ₹1,35,600 – ₹1,76,400 |
📊 Solar Subsidy for This 10kW System
Under the currently documented structure, a residential system of 3kW or above receives the ₹78,000 PM Surya Ghar central subsidy plus up to ₹30,000 in Delhi state capital subsidy (₹10,000/kW, capped at 3kW) — a combined ₹1.08 lakh. Neither cap rises with system size, so a 10kW installation receives the same fixed subsidy as a 3kW one; the return comes from generating more than three times the units, plus the Delhi GBI on top. For what’s confirmed versus still pending in Delhi’s policy, see our Delhi Solar Subsidy 2026 guide.
What Thermosun Handled — Start to Finish
- 1Site Survey & Connection Check Roof levels, shading and the home’s three-phase supply assessed before choosing the system design.
- 2Two-Frame Layout Design Raised steel tables designed for the terrace’s different levels while keeping access clear.
- 3Procurement of ALMM-Approved Components Panels and Sungrow three-phase inverter sourced from the MNRE-approved list for subsidy eligibility.
- 4Panel Installation Full 10kW array mounted and wired across both frames.
- 5Three-Phase Inverter & Panel Box Setup Sungrow inverter installed with DC box and four-pole AC box, fully conduit-protected.
- 6Safety Compliance Earthing and lightning protection installed and documented to IS standard.
- 7BRPL Inspection & Net Meter Net metering application filed, inspection coordinated, bi-directional meter installed.
- 8PM Surya Ghar & Delhi GBI Filed Complete subsidy and GBI registration submitted, bank details confirmed for DBT processing.
South Delhi Homes — We Cover Your Area
As a solar EPC company in Delhi handling design, installation, net metering and subsidy paperwork, Thermosun serves Sarvodaya Enclave, Malviya Nagar, Hauz Khas and the wider South Delhi belt directly.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
A 10kW three-phase installation on a roof with mixed levels is not a catalogue job. It needs someone to check the connection type, plan the frames around the terrace, match the inverter to the supply and file the right paperwork with the DISCOM. That’s the work behind more than 1,000 Thermosun installations across Delhi NCR, and it’s why homeowners with larger, more complex properties tend to call us the best solar company in Delhi when they want it done properly the first time.