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Most homeowners assume a bigger solar system just means more panels and one bigger inverter. That’s often true — but not always. On 18 September 2026, Thermosun completed a 7kW rooftop solar installation in Ramesh Nagar, West Delhi, using a dual-inverter configuration rather than a single large unit. Here’s why that decision was made, what it actually delivers for the homeowner, and what this system now saves each month.
Project Overview & Highlights
This Ramesh Nagar project covers nearly the entire available terrace — a full-coverage layout designed to extract maximum generation from a compact West Delhi rooftop. Here’s what was delivered:
Planning a Larger System for Your West Delhi Home?
Systems above 5kW need proper string planning, not just more panels. A free site survey from a solar installation company Delhi homeowners trust gets the design right before anything is ordered.
📞 Call Now 📄 Free Site SurveyWhy This System Uses Two Inverters Instead of One
The most distinctive part of this installation is visible in the inverter photo below — two separate Solare inverters mounted side by side, each with its own dedicated DC panel box, feeding into a shared AC connection point.
⚡ The Reasoning Behind a Dual-Inverter Design
Splitting a 7kW array across two inverters instead of running everything through one larger unit offers a few practical advantages on a residential rooftop. Each inverter handles its own string of panels, which means panel groups facing slightly different orientations or experiencing different shading patterns through the day can each operate at their own optimal point, rather than the whole array being dragged down to match the weakest section. It also builds in redundancy — if one inverter needs service, the other keeps generating rather than the entire system going offline.
For a homeowner, the practical result is steadier year-round output and less disruption during maintenance. It’s the kind of design decision that only comes from surveying the actual roof first, which is why rooftop solar installation Delhi projects shouldn’t be quoted over the phone from a system size alone.
Maximising a Compact West Delhi Terrace
Ramesh Nagar’s Block I is dense — closely packed independent houses, neighbouring terraces at varying heights, and a mobile tower visible in the immediate vicinity. Fitting 7kW onto a terrace of this size meant using nearly the entire usable roof area with a low-profile mounting layout rather than a tall elevated frame, keeping the array compact while still maintaining the right tilt for generation.
Net Metering With BRPL — How the Billing Works
Ramesh Nagar falls under BSES Rajdhani Power Limited (BRPL), the DISCOM covering most of West and South Delhi. After commissioning, Thermosun filed the net metering application with BRPL, coordinated the technical inspection, and had the bi-directional meter installed.
That meter is what makes the savings work: it separately records the units drawn from the grid and the surplus units the system exports back. At each billing cycle, BRPL nets the two figures off, so the household is charged only on the difference. On a 7kW system, daytime generation typically exceeds household consumption by a wide margin, which means a significant share of every month’s units get offset by exported solar.
Real Savings — What This Home Now Earns
With both inverters running and net metering active through BRPL, here’s the estimated monthly financial picture:
| Benefit | Monthly Value | Annual Value |
|---|---|---|
| Bill Reduction via Net Metering | ₹5,500 – ₹7,500 | ₹66,000 – ₹90,000 |
| Delhi GBI (₹2/unit generated, 3–10kW slab) | ₹1,700 – ₹1,900 | ₹20,400 – ₹22,800 |
| Total Monthly Financial Benefit | ₹7,200 – ₹9,400 | ₹86,400 – ₹1,12,800 |
📊 What Solar Subsidy Applies to a 7kW System
The PM Surya Ghar central subsidy caps at ₹78,000 for any system 3kW and above — so this 7kW installation receives the same fixed central amount as a 3kW one. The real advantage comes from generation: a 7kW system produces more than twice the units, while the per-kW cost drops as system size increases. Delhi’s state capital subsidy and the ongoing GBI incentive add further on top.
Confused about which Delhi subsidy figures are actually confirmed right now? We’ve broken down the ₹1.08 lakh, ₹1.56 lakh, and ₹1.75 lakh numbers — what’s official and what isn’t — in our Delhi Solar Subsidy 2026 guide.
What Thermosun Handled — Start to Finish
- 1Site Survey & Load Assessment Terrace area, shading from neighbouring structures, and household consumption assessed to confirm 7kW was the right size.
- 2Dual-Inverter System Design Array split into two strings, each sized to its own inverter for better performance and redundancy.
- 3Procurement of ALMM-Approved Components Panels and both Solare inverters sourced from the MNRE-approved list for subsidy eligibility.
- 4Full-Terrace Panel Installation 7kW array mounted across the available roof area with correct tilt and spacing.
- 5Dual DC & AC Panel Setup Separate DC boxes per string plus shared AC protection, all conduit-protected.
- 6Safety Compliance Earthing and lightning arrester installed and documented to IS standard.
- 7BRPL Inspection & Net Meter Net metering application filed, DISCOM inspection coordinated, bi-directional meter installed.
- 8PM Surya Ghar & Delhi GBI Filed Complete subsidy and GBI registration submitted, bank details confirmed for DBT processing.
West Delhi Rooftop — We Cover Your Area
From Ramesh Nagar and Moti Nagar to Rajouri Garden, Janakpuri, and Tilak Nagar — Thermosun handles design, installation, net metering and solar subsidy paperwork end to end.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
A 7kW system split across two inverters isn’t the cheapest way to build a rooftop array, and a supplier working purely off a price list wouldn’t suggest it. It’s the kind of call that only makes sense after properly reading the roof — its orientation, shading pattern, and how the homeowner actually uses power. As a solar EPC company in Delhi with over 1,000 completed installations, Thermosun designs each system around the property rather than fitting the property to a catalogue configuration. That approach is a large part of why homeowners across the city rate us among the best solar company in Delhi options for residential projects — solar for home installations where the engineering actually matches the roof.
More Real Installations Across Delhi
Frequently Asked Questions
Why would a 7kW solar system need two inverters?
Splitting the array across two inverters lets each string operate at its own optimal point, which helps when panel groups face different orientations or experience different shading. It also means one inverter can be serviced without the whole system going offline.
How much rooftop area does a 7kW system need?
Roughly 550-700 sq. ft. of shadow-free area. This Ramesh Nagar installation used nearly the full available terrace with a low-profile layout to fit within a compact West Delhi rooftop.
Does a 7kW system get more subsidy than a 3kW one?
No — the PM Surya Ghar central subsidy caps at ₹78,000 for any system 3kW or above. The benefit of a larger system comes from significantly higher generation and lower per-kW cost, not extra subsidy.
Which DISCOM handles net metering in Ramesh Nagar?
Ramesh Nagar falls under BSES Rajdhani Power Limited (BRPL), which covers most of West and South Delhi. Net metering applications for this area go through BRPL’s system.
How does net metering reduce the bill on a large system?
The bi-directional meter records both grid consumption and solar export. BRPL nets these off at billing. On a 7kW system, daytime generation usually exceeds household use considerably, so a large share of monthly units get offset.
How much can a Ramesh Nagar household save with a 7kW system?
Based on this installation, combined bill reduction and Delhi GBI income comes to approximately ₹7,200-₹9,400 per month, depending on actual generation and consumption patterns.
Conclusion
This Ramesh Nagar project is a good illustration of why system size alone doesn’t tell you much about how a solar installation should be built. A 7kW array on a dense West Delhi terrace, split across two inverters with independent strings, delivers steadier output and easier servicing than a single-inverter setup would have on this particular roof. Getting that decision right required surveying the property first — not quoting from a spec sheet. For homeowners across Ramesh Nagar, West Delhi, or anywhere in the city considering a larger rooftop system, a free site survey is the only reliable way to know what your roof actually needs.