📋 Table of Contents
- Project Overview & Highlights
- The Tall Rod on the Corner — Lightning Arrester & Earthing Explained
- KSolare 5G Pro Inverter — DC/AC Setup Explained
- Net Metering With BRPL Explained
- Real Savings — What This Home Now Earns
- What Thermosun Handled — Start to Finish
- Why Choose Thermosun
- Frequently Asked Questions
Look at the left corner of this Dwarka rooftop and you’ll notice a tall, thin rod rising above the panels. It’s easy to mistake it for an antenna, but it’s one of the most important parts of the installation. On 17 October 2026, Thermosun completed a 5kW rooftop solar installation in Pocket 3, Sector 11, Dwarka — and that rod is a good excuse to explain something most homeowners never ask about when buying a solar system: what protects it, and the house under it, when a thunderstorm rolls over Delhi.
Project Overview & Highlights
This Dwarka installation sits on a raised steel frame with an open terrace beneath it. Here’s exactly what was delivered:
Comparing Solar Quotes? Ask About Protection, Not Just Price
A reliable solar installation company Delhi homeowners can trust will show you exactly what’s included for safety. A free site survey covers it line by line.
📞 Call Now 📄 Free Site SurveyThe Tall Rod on the Corner — Lightning Arrester & Earthing Explained
A rooftop solar system is usually the highest, most exposed structure on a house, sitting in open sky with a metal frame running across it. That’s exactly the situation where lightning protection earns its keep.
⚡ What Each Part Does
- Lightning arrester (the tall rod): gives a lightning strike a preferred, low-resistance path to travel safely down a thick conductor to the ground, instead of through the panels, the inverter or the house wiring.
- Earthing: panel frames, the mounting structure and the inverter body are connected to dedicated earthing pits so any stray current has somewhere safe to go.
- Surge protection devices (SPDs): sit inside the DC and AC panel boxes and protect the inverter from sudden voltage spikes travelling along the cables, whether from a nearby strike or from the grid.
To be straightforward about it: no arrester offers a 100% guarantee against every possible strike, and solar panels don’t attract lightning any more than any other metal roof structure. What a proper arrester, earthing and SPD set-up does is dramatically reduce the risk and limit damage. Delhi sees heavy thunderstorms and dust squalls in the pre-monsoon months and again through the monsoon, so this isn’t a theoretical concern.
Earthing also needs a little ongoing care. Earthing pits typically work best when the surrounding soil stays moist, and many installers recommend a resistance check roughly once a year and watering the pits during dry months. It’s a small job, but it’s part of keeping a solar system safe for 25 years.
KSolare 5G Pro Inverter — DC/AC Setup Explained
This 5kW system runs on a KSolare 5G Pro grid-tied string inverter, installed between a DC panel box (panel side) and an AC panel box (grid side), all neatly routed along a wall-mounted cable tray with conduit-protected wiring. The protection devices inside those boxes are the same surge and overcurrent protection described above.
Net Metering With BRPL Explained
Dwarka 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 — 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 5kW system. Actual figures depend on consumption, season and panel cleanliness:
| 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. Moving from 3kW to 5kW doesn’t raise either cap; 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 & Load Assessment Terrace area, shading and household consumption assessed to confirm 5kW was the right size.
- 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 5kW array mounted and wired across the raised frame.
- 5Lightning Arrester & Earthing Arrester fitted to the structure, earthing completed and documented to IS standard.
- 6Inverter & DC/AC Panel Box Setup KSolare 5G Pro installed with protection devices, fully conduit-protected.
- 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.
Dwarka & Across West Delhi — We Cover Your Area
As a solar EPC company in Delhi handling design, installation, protection, net metering and subsidy paperwork, Thermosun serves Dwarka and the wider West Delhi belt directly.
💬 WhatsApp Now 📄 Free Site SurveyWhy Choose Thermosun
Safety fittings like an arrester, proper earthing and surge protection are invisible in a price comparison, which is exactly why they’re worth asking about. We include and document them on every rooftop solar installation Delhi homeowners trust us with, because a solar system that’s cheap to install but poorly protected costs far more when something goes wrong. That attention to the unglamorous details, across more than 1,000 installations, is why many homeowners call Thermosun the best solar company in Delhi for solar for home projects where reliability matters as much as the quote.