📋 Table of Contents
- Project Overview & Highlights
- Winter Sun, Tall Neighbours — Why Shadows Matter More Than You Think
- KSolare Inverter — DC/AC Setup Explained
- Net Metering With TPDDL Explained
- Real Savings — What This Home Now Earns
- What Thermosun Handled — Start to Finish
- Why Choose Thermosun
- Frequently Asked Questions
A roof that looks perfectly clear on a bright October afternoon can behave very differently in December. The sun sits much lower in the sky during Delhi’s winter months, and every taller building next door throws a longer shadow across the terrace. On 12 October 2026, Thermosun completed a 5kW rooftop solar installation in Block 2, Kamla Nagar — a dense North Delhi colony where neighbouring buildings rise on several sides — and it’s a good real example of why a solar survey has to account for winter, not just the day the surveyor happens to visit.
Project Overview & Highlights
This Kamla Nagar installation sits on a raised steel frame over a finished stone-tiled terrace, with taller buildings visible around it. Here’s exactly what was delivered:
Tall Buildings All Around Your Terrace?
Dense colonies are exactly where a proper shadow check matters most. A free site survey from a solar installation company Delhi homeowners trust looks at your roof in winter conditions, not just today’s sun.
📞 Call Now 📄 Free Site SurveyWinter Sun, Tall Neighbours — Why Shadows Matter More Than You Think
☀️ The Simple Geometry Behind It
At Delhi’s latitude, the noon sun sits almost directly overhead in June but only about 38° above the horizon at the winter solstice in December. That difference changes shadow length dramatically: a 3-metre-high wall or water tank throws a shadow of roughly 3.8 metres at noon in December, compared with almost none in June. Mornings and evenings are longer still.
This is why Thermosun’s site survey for rooftop solar installation in Delhi’s dense colonies doesn’t stop at “is the roof sunny today?” For this Kamla Nagar terrace, the team looked at the height and position of the neighbouring buildings on each side, then positioned and raised the array so the panels stay clear of the worst of the low winter shadows through the working part of the day. Output in December and January will still naturally be lower than in summer — shorter days, a lower sun and winter smog all play a part — but a layout planned around winter holds up much better across the full year than one planned around a sunny afternoon visit.
KSolare Inverter — DC/AC Setup Explained
This 5kW system runs on a KSolare grid-tied string inverter, installed with a dedicated DC panel box (isolator and protection on the array side) and an AC panel box (MCB and isolator on the grid side), both routed through surface conduit for a clean, weatherproof finish.
Net Metering With TPDDL Explained
Kamla Nagar falls under Tata Power Delhi Distribution Limited (TPDDL), the DISCOM covering most of North and North-West Delhi. After commissioning, Thermosun filed the net metering application through TPDDL’s system, coordinated the inspection, and had the bi-directional meter installed. That meter records grid consumption and solar export separately, and TPDDL 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 TPDDL, here’s the estimated monthly financial picture for this 5kW system. Actual figures depend on consumption, season and how clean the panels are kept:
| Benefit | Monthly Value | Annual Value |
|---|---|---|
| Bill Reduction via Net Metering | ₹3,000 – ₹4,500 | ₹36,000 – ₹54,000 |
| Delhi GBI (₹2/unit generated, 3–10kW slab) | ₹1,000 – ₹1,250 | ₹12,000 – ₹15,000 |
| Total Monthly Financial Benefit | ₹4,000 – ₹5,750 | ₹48,000 – ₹69,000 |
📊 Solar Subsidy for This 5kW 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. The 5kW size doesn’t increase either cap, so the extra return comes from higher generation, plus the Delhi GBI on top. Delhi has also announced a revised scheme for eligible low-consumption households, but it isn’t live on the official portal yet — see our Delhi Solar Subsidy 2026 guide for what’s confirmed and what isn’t.
What Thermosun Handled — Start to Finish
- 1Site Survey & Winter Shadow Check Neighbouring building heights and positions assessed against low winter sun angles.
- 2Raised Frame Design Galvanized steel structure raised to keep panels clear of the worst shadows while leaving the terrace usable beneath.
- 3Procurement of ALMM-Approved Components Panels and KSolare inverter sourced from the MNRE-approved list for subsidy eligibility.
- 4Panel Installation Full 5kW array mounted and wired across the raised frame.
- 5Inverter & DC/AC Panel Box Setup KSolare inverter installed with labelled DC and AC boxes, fully conduit-protected.
- 6Safety Compliance Earthing and protective wiring documented to IS standard.
- 7TPDDL 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.
Kamla Nagar, North Campus & Across North Delhi — We Cover Your Area
As a solar EPC company in Delhi handling design, installation, net metering and subsidy paperwork, Thermosun serves Kamla Nagar, Roop Nagar, Model Town and the wider TPDDL zone directly.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
Any installer can put panels on a sunny roof in October. The difference shows up in December, when a poorly planned layout starts losing hours of generation to a neighbour’s wall. Surveying for winter conditions up front, rather than discovering the problem after commissioning, is the kind of detail that has made Thermosun the best solar company in Delhi in the eyes of homeowners in tightly built colonies. It’s how we approach every solar for home project — a layout designed to perform all year, not just on survey day — with over 1,000 installations behind that approach.
More Real Installations Across Delhi
Frequently Asked Questions
Do taller neighbouring buildings affect rooftop solar output?
They can, mainly in winter when the sun is low and shadows are long. A proper site survey checks the height and position of nearby buildings and adjusts panel placement and frame height so the array stays clear of the worst shadows during peak generation hours.
Is solar generation lower in Delhi’s winter?
Yes, typically. Shorter days, a lower sun angle and smog reduce output in December and January compared with summer. Annual generation is what a system is sized for, and a layout planned for winter shadows holds up better across the full year.
Which DISCOM handles net metering in Kamla Nagar?
Kamla Nagar falls under Tata Power Delhi Distribution Limited (TPDDL), which covers most of North and North-West Delhi. Net metering applications for this area go through TPDDL’s system.
How much solar subsidy does a 5kW system get in Delhi?
Under the currently documented structure, a 5kW 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. Always confirm the latest figures on the official Delhi Solar Portal before applying.
Does a 5kW system get more subsidy than a 3kW one?
No. Both the central and Delhi state subsidies are capped at the 3kW level, so a 5kW system gets the same fixed amount. The additional benefit comes from higher generation and a lower cost per kW.
How much can a Kamla Nagar household save monthly with a 5kW system?
Based on this installation, combined bill reduction and Delhi GBI income comes to roughly ₹4,000–₹5,750 per month, depending on consumption, season and panel cleanliness.
Conclusion
This Kamla Nagar installation is a reminder that the best time to plan for winter is before the panels go up. In a colony where taller buildings crowd the terrace on several sides, getting the frame height, panel placement and shadow check right is what separates a system that performs year-round from one that disappoints in December. For homeowners across Kamla Nagar, North Campus or anywhere in TPDDL’s North Delhi zone wondering whether their own hemmed-in terrace can still deliver good returns, a free site survey gives a definite answer based on your actual roof.