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Not every homeowner wants to size their solar system for today’s electricity bill alone. On 29 September 2026, Thermosun completed a 3kW rooftop solar installation in Block A, Inderpuri, for a homeowner planning to add a second floor within the next few years. Rather than wiring a single-circuit system that would need to be partly redone later, Thermosun designed the electrical infrastructure across two separate inverter circuits from day one — a decision that’s easy to miss in a photo but makes a real difference down the line.
Project Overview & Highlights
This Inderpuri installation sits on a tall, carport-style elevated structure over a modern terrace with glass railings. Here’s exactly what was delivered:
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📞 Call Now 📄 Free Site SurveyWhy This 3kW System Was Wired for Future Expansion
Most 3kW residential systems run on a single inverter — there’s usually no technical need for two on a system this size. Here, the homeowner mentioned plans to build an additional floor in the coming years, which would mean more household load and room on the roof for more panels later.
🔌 Designing for “Not Yet” Instead of Just “Right Now”
Thermosun split the electrical layout across two separate inverter circuits, each with its own DC and AC panel box, even though the current 3kW array doesn’t strictly need it. The advantage shows up later: when the homeowner adds more panels after the second floor is built, the second circuit is already in place and simply gets connected to new panels, rather than requiring an electrician to rewire the existing system from scratch. It’s a small additional cost now that avoids a much bigger one later.
This kind of planning-ahead approach is something a phone quote or a template-based installer typically won’t offer, since it requires actually discussing the homeowner’s longer-term plans during the site visit rather than just measuring the current roof.
A Tall Carport-Style Structure Over a Modern Terrace
The terrace itself has a glass balustrade and finished flooring, closer to a usable outdoor living space than a bare utility roof. Thermosun built a tall elevated steel structure — closer to a carport in height than a typical solar frame — so the terrace below remains fully usable for the homeowner’s daily use, with the panels sitting well clear overhead.
Net Metering With BRPL Explained
Inderpuri falls under BSES Rajdhani Power Limited (BRPL) territory. Thermosun filed the net metering application with BRPL after commissioning, coordinated the inspection, and had the bi-directional meter installed — the meter that records both grid consumption and solar export, netted off against each other at every billing cycle.
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:
| 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
This installation qualifies for the full ₹78,000 PM Surya Ghar central subsidy, plus up to ₹6,000 in Delhi state capital subsidy, on top of the ongoing Delhi GBI incentive. When the homeowner expands the system later, any additional capacity would be assessed for subsidy separately under whatever scheme is active at that time. For the current confirmed figures versus what’s still pending, see our Delhi Solar Subsidy 2026 guide.
What Thermosun Handled — Start to Finish
- 1Site Survey & Future-Plan Discussion Roof assessed alongside the homeowner’s plans for a future additional floor.
- 2Dual-Circuit Electrical Design Two inverter circuits planned so future expansion won’t require rewiring the existing system.
- 3Tall Carport-Style Structure Design Elevated frame built to keep the terrace below fully usable.
- 4Procurement of ALMM-Approved Components Panels and inverters sourced from the MNRE-approved list for subsidy eligibility.
- 5Panel Installation Full 3kW array mounted and wired across the elevated structure.
- 6Safety Compliance Earthing and lightning arrester 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.
Inderpuri or Anywhere Across Delhi — We Plan for Your Future Too
As a solar EPC company in Delhi, Thermosun designs each installation around both your current needs and what’s coming next.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
Asking a homeowner about their plans for the next five years, and then actually designing the electrical layout around that answer, isn’t something every installer bothers to do — it’s easier to just quote the current roof and move on. That extra step is a meaningful part of why Thermosun is regarded as the best solar company in Delhi among homeowners who want solar for home installations that hold up over time, not just at handover. Every rooftop solar installation Delhi project we take on gets this same level of actual conversation before a single panel goes up.