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Most homeowners spend weeks comparing solar quotes and then never look at the small box on the wall that actually tells them whether the system is working. On 14 October 2026, Thermosun completed a 3kW rooftop solar installation in Block B, Naraina Vihar, and at handover the homeowner’s first question wasn’t about panels or subsidy — it was “how do I know it’s working?” It’s a fair question, and the answer fits in thirty seconds a week.
Project Overview & Highlights
This Naraina Vihar installation sits on a raised steel frame on a terrace shared with a water tank, in a residential colony of closely built houses. Here’s exactly what was delivered:
Want Solar That’s Easy to Understand After Installation Too?
A good solar installation company Delhi homeowners can rely on explains how to check your system, not just how to switch it on. A free site survey includes a walkthrough of exactly that.
📞 Call Now 📄 Free Site SurveyReading Your Inverter — A 30-Second Weekly Check
The wall-mounted unit in the photo below is a KSolare 5G Pro grid-tied string inverter, with a DC panel box on its left (the panel side) and an AC panel box on its right (the grid side). The inverter’s display and indicator lights are the quickest way for any homeowner to see what the system is doing — no technical background needed. This is the routine we walk every solar for home customer through at handover:
✅ The Weekly Check — Once, Around Midday
- Look at the display: on a clear day around noon it should show the system generating. A 3kW system usually delivers somewhat below its rated figure at peak — often in the 2–2.5kW range on a clear day — which is normal because of heat and system losses.
- Check the indicator lights: a fault indication means the inverter has detected a problem and needs attention. Normal operation shows no fault.
- Glance at the wiring and boxes: conduits intact, box covers closed, nothing hanging loose.
- Compare with your bill: once a month, check the export units on your net meter bill statement — they should roughly track what the inverter reports.
- Don’t worry at night: the display going blank or standing by after sunset is normal.
When should you call? If the fault indication stays on for more than a day, if the display shows zero output in full midday sun, or if generation suddenly drops sharply compared with similar sunny days. In most cases the cause is something simple — a tripped breaker, a loose connection, or a layer of dust — but it’s worth having it looked at rather than losing weeks of generation without noticing.
Raised Frame Over a Working Terrace
Like many terraces in Naraina Vihar’s closely built blocks, this one has to do several jobs at once: it holds a water tank, gives access to the staircase and serves as usable outdoor space. Thermosun’s team built a raised galvanized steel frame so the panels sit clear above the working area, leaving the terrace accessible beneath. It’s a practical solution we use often for rooftop solar installation Delhi homeowners ask for in compact residential colonies, where giving up the terrace entirely isn’t an option.
Net Metering With BRPL Explained
Naraina Vihar falls under BSES Rajdhani Power Limited (BRPL). After commissioning, Thermosun filed the net metering application with BRPL, coordinated the inspection, 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 — which is exactly why comparing the export figure on your bill with your inverter’s reading is such a useful monthly habit.
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 3kW system. Actual figures depend on consumption, season and panel cleanliness:
| Benefit | Monthly Value | Annual Value |
|---|---|---|
| Bill Reduction via Net Metering | ₹2,200 – ₹3,200 | ₹26,400 – ₹38,400 |
| Delhi GBI (₹3/unit generated, up to 3kW slab) | ₹1,000 – ₹1,200 | ₹12,000 – ₹14,400 |
| Total Monthly Financial Benefit | ₹3,200 – ₹4,400 | ₹38,400 – ₹52,800 |
📊 Solar Subsidy for This 3kW System
Under the currently documented structure, a 3kW residential system receives the ₹78,000 PM Surya Ghar central subsidy plus up to ₹30,000 in Delhi state capital subsidy (₹10,000/kW) — a combined ₹1.08 lakh, with the Delhi GBI paying ongoing per-unit income on top. Delhi has also announced a revised scheme for eligible low-consumption households, but it isn’t live on the official portal yet. For what’s confirmed and what isn’t, see our Delhi Solar Subsidy 2026 guide.
What Thermosun Handled — Start to Finish
- 1Site Survey & Terrace Planning Water tank position, staircase access and shadow from neighbouring buildings assessed before finalising the layout.
- 2Raised Frame Design Galvanized steel structure designed to keep the terrace usable beneath the panels.
- 3Procurement of ALMM-Approved Components Panels and KSolare inverter sourced from the MNRE-approved list for subsidy eligibility.
- 4Panel Installation Full 3kW array mounted and wired across the raised frame.
- 5Inverter & DC/AC Panel Box Setup KSolare 5G Pro installed with labelled DC and AC boxes, fully conduit-protected.
- 6Safety Compliance Earthing and protective wiring documented to IS standard.
- 7BRPL Inspection & Net Meter Net metering application filed, inspection coordinated, bi-directional meter installed.
- 8Handover Walkthrough & Subsidy Filing Homeowner shown how to read the inverter; PM Surya Ghar and Delhi GBI registration submitted for DBT processing.
Naraina, Inderpuri & Across West Delhi — We Cover Your Area
As a solar EPC company in Delhi handling design, installation, net metering and subsidy paperwork, Thermosun serves Naraina Vihar and the surrounding West Delhi colonies directly.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
Installing the panels is the easy part of any solar project. What separates good installers from the rest is what happens after handover — whether the homeowner actually understands their system, knows what normal looks like, and has someone to call when something doesn’t. That after-sales mindset, backed by over 1,000 completed installations, is why homeowners across West Delhi describe Thermosun as the best solar company in Delhi for people who want solar they can trust long after installation day.
More Real Installations Across Delhi
Frequently Asked Questions
How do I know if my solar system is working properly?
Check the inverter display around midday on a clear day — it should show the system generating — and make sure no fault indication is showing. Once a month, compare the export units on your net meter bill with what the inverter reports.
Why doesn’t my 3kW system produce a full 3kW at midday?
Real-world output at peak is usually somewhat below the rated capacity because of heat, wiring and inverter losses and any dust on the panels. Often 2–2.5kW on a clear day is normal for a 3kW system.
Is it normal for the inverter display to go blank at night?
Yes. With no sunlight, the inverter stops generating and the display typically goes blank or into standby until the sun comes up again.
Which DISCOM handles net metering in Naraina Vihar?
Naraina Vihar falls under BSES Rajdhani Power Limited (BRPL). Net metering applications for this area go through BRPL’s system.
How much solar subsidy does a 3kW system get in Delhi?
Under the currently documented structure, a 3kW residential system receives the ₹78,000 PM Surya Ghar central subsidy and up to ₹30,000 Delhi state capital subsidy — ₹1.08 lakh combined — plus the Delhi GBI. Confirm the latest figures on the official portal before applying.
How much can a Naraina Vihar household save monthly with a 3kW system?
Based on this installation, combined bill reduction and Delhi GBI income comes to roughly ₹3,200–₹4,400 per month, depending on consumption, season and panel cleanliness.
Conclusion
This Naraina Vihar installation is a reminder that a solar system is only as good as the homeowner’s ability to tell it’s working. A raised frame that keeps the terrace usable, a clean DC/AC panel setup, correct BRPL net metering and a simple weekly check at the inverter is what turns a one-time installation into reliable generation for the next 25 years. For homeowners across Naraina, West Delhi or anywhere in the city who’d like a straightforward walkthrough of their own roof’s potential — and of how to keep an eye on the system afterwards — a free site survey is the easiest place to start.