Solar Innovation & DC Power
From Kunwer Sachdev — then MD and CEO of Su-Kam, the Solar Man of India — whose passion was new projects, new technologies, and training people. The solar PCU, Direct-DC rural homes, and field projects, in his own record.
How to Size a Solar System for Your Home (Load, Panels, Inverter & Battery)
Solar Basics Part 3: daily load in Wh, PV sizing with efficiency losses and peak sun hours, inverter headroom and surge, battery Ah — illustrative worked example.
What Are Solar Panels Made Of? Structure, Types & Installation Explained
Solar Basics Part 2: glass, EVA, cells, backsheet, frame and junction box; mono vs poly vs thin film; tilt, racks, arrays, 4 sq.mm interconnect and conduit — plain English.
Let the Sun Pay Your Electricity Bills
Solar Basics Part 1: why sunshine matters in India, what photovoltaic means, the four home-system components, how light becomes DC, and cell → panel → array — explained in plain English.
Marico Was the Toughest Award We Ever Won. At One Stage We Had Lost Hope.
Marico Innovation for India 2008 — paperwork, interview, full audit; two dedicated colleagues later poached. ManagementNext + Daijiworld + MIF winners.
Every Certification Was Top-Down. Every Award Had a Story Behind the Plaque.
CE (DNV 2005), UL, ISO + National Quality, Superbrand, Marico — top-down Su-Kam certs & awards; images + MIF/Daijiworld/ET sources.
I Patented Petrol-Pump Sales Monitoring Through Current. Then We Solarised the Forecourt.
Petrol-pump inverters + patent 1255/DEL/2009 — current×time sales software (~99% online). Field tests; solar chapters AP→Jalgaon→Panipat linked.
I Built a ₹100 Crore SMF Plant at Katha. First VRLA for Inverters — Then Warranty Returns Hit Us in 2008.
Su-Kam ₹100cr Katha SMF/VRLA plant (Reliance fund). First inverter-duty sealed battery; North India warranty flood hit 2008 sales.
We Put Inverter and Battery Banks on Telecom Towers — Tata First, Then Reliance.
Compact inverter + battery bank for Tata towers (Mumbai→MH/Gujarat), cut diesel; later RCOM. Reliance investor 2006; tele.net 2008.
I Built India’s First Plastic Inverter. Chic and Krazy Were Capacity Twins — Then Plastic Became the Su-Kam Brand.
Chic = India’s first plastic inverter (GE Plastics, India Today). Krazy = same plastic, different capacity. Fairy Queen + Alliance Darpan 2004. Variants built Su-Kam.
Micron Became Quite Famous. Crunchy Was the Same 250VA Idea in Plastic.
One essay: Micron’s famous 250VA Home UPS + Crunchy plastic twin — zero switchover, dealer margin fight, then pickup. VARINDIA + YouTube + IndiaMART.
We Put the SMF Battery Inside the Inverter. Matrix Won Delhi NCR. Freight Killed the Rest.
2008 Matrix: Pure Sinewave 12V & 24V, SMF in one cabinet. Fanfare launch; Delhi NCR partial success; other states failed on weight and cost.
I Took the Land and Built Afresh — Factory by Factory for Twelve Years.
2000 Gurgaon first factory → R&D + ground-floor production → Baddi units & Katha. Corporate Focus photos. Kunwer Sachdev.
Before Facebook. Before Hashtags. We Kept the Press Clippings.
2001–2008 Corporate Focus PRESS CLIPPINGS: Hindustan, TOI, Business India, ET, Jagran, Guardian Tanzania, Superbrands — one dated scrapbook blog.
We Did Not Stand in the India Pavilion. We Took a Stall in the Main Halls of Munich.
Intersolar Europe June 2011: Kunwer Sachdev led Su-Kam’s first Europe show — main-hall stall, CE/UL already earned, honest follow-through that did not convert well.
Kohler Wanted Our Dealers. We Launched Together. Then We Had to Walk Away.
2012 Su-Kam × Kohler genset launch: dealer network, David Kohler visit, UK Best Magazine accolade — then product shortfalls and calling off the JV to protect the Su-Kam brand.
I Flew to Afghanistan Twice. We Powered Telecom Across 17 Provinces.
Under Kunwer Sachdev as CEO & MD: US Army era, two personal visits, RMA telecom solar across 17 provinces, trained 34, Solar PCUs. Electronics Maker + FB cited.
Under My Leadership as CEO & MD, Su-Kam Won the Tata Power Delhi Solar MoU.
Under Kunwer Sachdev as CEO & MD: Aug 2013 TPDDL MoU — grid-feed 1–10 kW, DISCOM-adjusted subsidy, ~14 lakh Delhi customers. ET cited.
SP1A Was Not a Trophy. It Was How We Planted Our Foot in MNRE.
Highest MNRE–CRISIL SP1A solar grade — hard-won for a respected MNRE foothold. Official lists, CRISIL framework, EFY, July 2014 archive.
I Flew to Gabon Four Times. We Beat a French Competitor. Then We Lit 40,000 Homes.
Biggest Gabon win: Jan 2015 ~$25m / 40,000 rural DC homes — Embassy relationship, four visits, French competitor; install over ~2 years. Earlier: 2,000 street lights + Nkok 400 (OBG).
We Met Our Malawi Distributor at GITEX. He Built the Su-Kam Brand There.
GITEX Dubai → Mohammad Nathani and his firm Natsons → aggressive Malawi projects and Su-Kam brand. Five villages on wind–solar hybrid; Face of Malawi + founder essay cites.
MEA Sent Us to Rwanda. Thirty-Five Schools Had Never Had Power.
35 schools MEA grant succeeded → Rwanda asked India for 105 more → MEA agreed; letter of appreciation. Preneet Kaur 2012; ₹2.59 cr cited.
Rwanda Asked India for 105 More Schools. MEA Agreed. We Got the Order.
Success on 35 schools → Rwanda requested India → MEA awarded Su-Kam 105-site turnkey + letter of appreciation. May 2014 Facebook; schools blog for press.
At RE-INVEST 2015 I Said Inverters Had 0% Chinese Share. Then NCLT Opened the Floodgates.
PM Modi RE-INVEST stage · Electronics Maker 0% Chinese share · solar PCUs + patents · post-NCLT China flood & rebadging — founder indictment.
50 kW at Shivalik Patiala. Then Schools & Colleges Became a Continuous Series.
Shivalik ~50 kW grid-tied (BS/HT/Energetica) · continuous school/college series · training · first Indian manufacture-and-install claim.
Oshakati Did Not Need a Brochure. It Needed Power on a Family Wall.
Namibia Oshakati home solar under Kunwer Sachdev as CEO & MD — FB March 2013, KS field essays; commercialising solar for ordinary southern African households.
100 kW on a College Roof in Gooty. Labs Stopped Dying in the Cut.
Prestigious Gates Gooty 100 kW — Kunwer Sachdev focussed on campus solar; Solar Man of India; South foothold after North/West/East. Blogspot + FB.
955 Street Lights in Nagaland. Proof We Were Already Everywhere.
Nagaland ~955–1,000 Su-Kam solar street lights (EQ Mag 2017) — MNRE prize to Su-Kam, only company prize; training + brand in street lights, grid-feed & storage when solar was still costly.
First Solar in Agartala. Then We Became the Strongest Company in the North-East.
Ujjayanta 45 kWp TREDA Solar City (Mar 2014) — strongest NE install brand: dealers, district after-support, local training; MNRE preferred Su-Kam. EFY/BS + Discovery Sun Fuel embed.
We Launched Brainy in Jaipur. Hybrid Solar for Ordinary Homes.
Brainy solar hybrid inverter — Jaipur dealer launch Jul 2012; EFY hybrid + Brainy UPS cites; Manthan/training archive images under Kunwer Sachdev as CEO & MD.
We Built India’s First BEE 4-Star Inverter — Before the Standard.
Falcon HBU — BEE 4★ first (Energetica), ~90% HF UPS, failed twice then cracked rural power; bill table + essay images; ELE Times / Electronics Maker. Kunwer Sachdev CEO & MD.
Clay Craft Was Jaipur’s First Big Rooftop. I Still Call It That.
Founder story — Clay Craft VKI Jaipur first big commercial rooftop; EM first Su-Kam Jaipur solar + IT Voice VKI/200 kW path; minister & RREC inauguration. Kunwer Sachdev CEO & MD.
EIL Put Us on a Navratna Roof. After That, the Projects Kept Coming.
EIL Sector 16 Gurugram 90 kWp (Dec 2013) — Navratna consultant on big India/abroad govt projects; their roof opened more doors; press flyer + FB. Kunwer Sachdev CEO & MD.
SBI’s Training Hub Went Solar. That Was Our Big Entry Into the Bank.
SBI Academy Gurukul ~100 kWp — training-hub entry into SBI; with EIL/PEC/Clay Craft, the projects that earned Solar Man of India. Dollar Business + campus photos. Kunwer Sachdev CEO & MD.
IFFCO’s New HQ. Plan Revised Five Times. 250 kW Ordered — 75 kW Built.
IFFCO Gurugram HO — fresh building, 5 aesthetic redesigns; founder visited twice, met senior IFFCO; 250→75 kW. Energetica/NCN; aerials. Kunwer Sachdev CEO & MD.
A Hydro Giant Put Solar on Its Faridabad Roof. We Built It.
NHPC Faridabad 70 kWp grid-tie (~2014) — Navratna hydro major’s corporate roof; ~84k units/yr; dead-load mount. Flyer + FB #WednesdayWisdom. Kunwer Sachdev CEO & MD.
We Sold Power to HUDA Metro. Dust and Theft Were the Real Teachers.
HUDA City Centre 100 kWp RESCO (2015) — lease power to DMRC; parking dust cut yield; panel theft delayed install. NCN + Hindi press. Kunwer Sachdev CEO & MD.
I Went to Chandigarh Myself to Open Our First Live Solar Experience Centre.
1 Oct 2014 — MD Kunwer Sachdev opened Su-Kam’s first Live Solar Experience Centre in Chandigarh as the UT went Solar City green; already had PEC 1 MW there. FB archive.
I Walked CET’s Roof With Our Distributor Before We Put 135 kW On It.
College of Engineering Thiruvananthapuram 135 kW grid-tie — founder visited with distributor before install; Su-Kam blog + FB #WednesdayWisdom. Kunwer Sachdev CEO & MD.
ITM’s Car Park Became a Solar Shed. Manesar’s Polymer Roof Was Next on the Same Leaf.
ITM University Gurgaon 150 kWp parking carport + Rani Polymers Manesar 135 kWp — Energetica 21 Aug 2015 (KS MD quote) + FB WW. Kunwer Sachdev CEO & MD.
A Fan-and-Blower Factory in Yamunanagar Put 100 kW on the Roof. That Was the Point.
Multivent Engineers Manakpur ~100 kW grid-tie — 30×3 kVA, 400 panels, Harwinder/Solarium channel; Su-Kam blog + FB. Kunwer Sachdev Solar Man of India.
I Said Every Street Light in India Should Be Solar. The Hindu Put It on Record.
26 Apr 2016 — The Hindu: Su-Kam Sunway solar street light sans grid link; Made in India Li-ion 4W–50W; KS MD quote. Electronics Maker same day.
2015: First BEE 4-Star. Six Million Products. Discovery Put Us On Air.
2015 scoreboard under Kunwer Sachdev — BEE 4★ first (Energetica), Falcon HBU, ~6M products, Discovery Sun Fuel embed, Nepal relief; BS/ANI + Wikipedia.
When Swissnex Chose Su-Kam, India Noticed. That Visit Was Status.
January 2018 Solartech Industry Connect: Kunwer Sachdev built a small host team and personally arranged Su-Kam HO, R&D and Baddi for Swissnex — prestige branding, hospitality, and the hard-road story of an Indian factory that thrived anyway.
Under Kunwer Sachdev’s Leadership, Su-Kam Gave the Solar Energy Centre (Now NISE) Its First 15 kW Solar PCU in 2013
Solar Energy Centre → NISE. Under Kunwer Sachdev: products for use/testing, first 15 kW Solar PCU (2013), training people they sent including early Suryamitra batches, factory visit photos.
When No One Wanted Solar, We Put 1 MW on PEC’s Roof.
PEC Chandigarh SECI 1 MW (media figure) — tender Jan 2014, CREST Solar City, Discovery Sun Fuel; IT Voice/Energetica + KS essay backlinks. Kunwer Sachdev CEO & MD.
When National Press Put a Name on Solar — ET, Cover Stories and Live TV
Economic Times features and quotes, CELERITY #MissionSun cover, Business Today Budget exclusive, NewsX TV — Kunwer Sachdev’s first-person media spine with archive images and live press links.
People in the Village Went Solar. The Caption Asked: When Will You?
8 Dec 2017 FB album — Bhalki/Bidar; Brainy Eco in album; highest rural engagement. Story refs: rural-solar + Going Solar. Kunwer Sachdev.
That Municipal School Had Never Seen a Switch. We Gave It 24/7 Light.
Jaipur municipal school — never had grid; Su-Kam 3 kW Solar PCU + panels + 4× TOTAL; Mr. Ramish. FB archive + KS.com. Kunwer Sachdev.
₹10,000, a Pen Box, and a Full Page That Said: Become a Problem Solver
Why Jagran Josh Plus interviewed Kunwer Sachdev (19 Feb 2014) — बने प्रॉब्लम सॉल्वर; ₹10k→₹1,000 cr; MD Speak firsts. Scan + BT Leaderspeak.
Every Award Had a Form. Every Form Needed Proof. That Is How We Built the Su-Kam Brand.
Twelve-slide Su-Kam awards presentation walkthrough — National Quality, Sectoral Export, Superbrand, Marico, ISA, Entrepreneur of the Year — and how Kunwer Sachdev personally filled the forms that built a technology + distribution brand.
A Chess Champion Handed Me the Trophy. Then I Spoke to a Room Full of Foreign Semiconductor Companies.
ISA Technovation 2011, Bangalore: Kunwer Sachdev personally received the Energy/Solar award for Su-Kam’s Solar PCU — then addressed a hall of mostly foreign semiconductor firms as India’s rare electronics exporter to ~45 countries.
Bolivia Came Looking for Lithium. They Walked Into a Solar Factory in Gurugram.
March 2018: Bolivia’s Ambassador visited Su-Kam for lithium, batteries, power cuts, joint ventures — and solar. Kunwer Sachdev was in the room when the official meeting became a real conversation.
Malaysia Did Not Need Another Brochure. It Needed Our Hybrid Brain on Stage.
Kinhi Mabuya 2018 — Brainy/Falcon+ ASEAN launch; hybrid patent + transformer isolation; exports story; pv magazine. Kunwer Sachdev.
Why Inverting DC to AC Was a Mistake: The Direct-DC Innovation Behind India’s 40,000 Solar Homes Project
How Kunwer Sachdev and Prof. Ashok Jhunjhunwala (IIT Madras) proved Direct-DC solar efficiency, leading to the electrification of 40,000 rural UP homes under Lohia Awas.
Eighteen Assam Rifles Outposts. 1.3 MW. I Visited Six Myself.
Not one plant — eighteen Assam Rifles sites, 1.3 MW via REIL/JNNSM. Kunwer Sachdev visited six personally. Moreh 100 kW is one HQ.
The Houses Were Free. The Last Mile Was Not: Su-Kam’s 10,000-Home Tamil Nadu Green House Project
Under Kunwer Sachdev as CEO & MD: Jayalalithaa called; ~20 kW at her residence to prove credentials; then 10,000 TN Green House homes — hard stop on losses.
State’s First Petrol Station Run on Solar: The 2013 Andhra Pradesh Press That Opened the Forecourt
April 2013 cuttings: Kodad (Nalgonda) and Shadnagar on Su-Kam solar backup — 5 kVA PCU, 2 kW panels — and the dispenser jerk-current problem.
A Petrol Pump That Cannot Afford Darkness: Su-Kam’s 10 kVA Off-Grid System in Jalgaon
Three dispensers on a 10 kVA off-grid Solar PCU in Jalgaon — after the hard problem of high, pump-by-pump starting current. Recovered from the Su-Kam blog archive.
Haryana’s First Solar Petrol Pump: Royal Indian Filling Station, Sanoli, Panipat
Dainik Tribune, 3 June 2015: 10 kVA at Royal Indian Filling Station near Sanoli — Haryana’s first fully solar petrol pump, operator Sanjeev Chaudhary.
The Hindu Named It in the Pipeline. The Company Blog Named the Hospital.
April 2013: Parakala Lalitha Nursing Home, Warangal — 10 kW rooftop, same week as the AP petrol-pump cuttings.
Four Hours of Grid. Four Brainy Eco Boxes. A Sub-District Hospital in Anantnag.
December 2016 company blog: Sub District Hospital, Anantnag — four Brainy Eco 1100s on lighting circuits after 4–5 hours of grid a day.
Twenty Days Before He Died, Kalam Lit Up Two Villages With Us
KS essay rewrite — Kalam 7 July 2015 Su-Kam 250 kW mini-grid; Jagran, Su-Kam flyers, ET Energyworld, BS. Backlink to full essay.
No Mains. No Inverter Losses. A House in Fazilka That Ran Entirely on Solar DC.
10 July 2016: Mr. Dinesh Modi’s home in Ghallu, Abohar — Solar DC System 120, no mains, DC fan, light and dish TV.
The Marketing Guru of India: How I Built the Su-Kam Brand Without the Biggest Budget
Umbrellas on a thousand street carts, branded buses, 'Su-Kam Lao, Mercedes Chalao', India's first inverter YouTube channel, 1,000+ dealer meets, and the dais with Philip Kotler — how Kunwer Sachdev out-branded bigger rivals with sharper ideas, not deeper pockets.
Why Our Mentor Built GiftedKids.in — India's First Gifted Education Platform
At 47, the Solar Man of India discovered he had been an unidentified gifted child — so he co-founded GiftedKids.in to find the others.
InverterIndia.com: The No-Bias Power Buying Authority Our Mentor Built
Zero affiliate links, lab-tested numbers — the honest inverter & battery buying resource Kunwer Sachdev built.
How Kunwer Sachdev Built India's Solar Industry: From Su-Kam's First Inverter to 77 Patents at Su-Kam
From a 1988 startup to power backup in 1998, Kunwer Sachdev built Su-Kam into a brand with 77 patents filed at Su-Kam, 90+ export markets and ₹1,200 crore in revenue by 2019. This is how it happened.
The Solar Man of India Has Launched a Knowledge Platform for the Solar World
Our mentor, Kunwer Sachdev, is giving three decades of solar knowledge away — free, to everyone.
Why We Built the Su-Kam Solar YouTube Channel: The Training Problem That Changed Everything
167 videos. 105,000 subscribers. But it started with a far more urgent problem — people leaving and taking everything they knew with them.
The Solar DC System That Lit 50,000 UP Homes — and Got a Discovery Channel Documentary
From a dropped TEDA pilot to 50,000 UPNEDA homes. BLDC fans invented from scratch. A grid-integrated MPPT patent. Then Discovery Channel showed up.
The Hybrid Solar Inverter That Changed Everything: Running Load From Both Solar and Mains
In 2009–10, Su-Kam built the first solar inverter that could charge batteries and run home loads simultaneously from solar and grid. 1.35M+ views across 3 videos.
The Hidden Tax: Why Your Data Center Wastes 21% of Its Power
Three conversions. 21% loss. Billions burned as heat every year.
DC-Direct Architecture: Eliminating the Middleman Between Solar and Server
The complete architecture for powering servers directly from solar.
Why LiFePO4 + Solar = 10-Year Battery Life for Servers
The battery chemistry that makes solar-powered data centers viable.
AI-Powered DC Microgrids: The Future of Data Center Power
How AI transforms DC microgrids into self-optimizing power systems.
From Su-Kam DC 120 to Data Center Scale: A Patent Journey
77 patents filed at Su-Kam. One vision. The world is finally catching up.
Su-Kam HLS1210: The Solar Home Light System
A commercial solar solution designed for rural and urban homes alike.
TEDA 100Wp Solar PCU: Powering Tamil Nadu's Government Solar Revolution
A government project that brought solar power to Tamil Nadu homes.
The Solar PCU — How a Meeting in Tamil Nadu Changed Indian Solar Forever
The 2007 TEDA project that gave birth to Su-Kam's Solar PCU and defined the company's identity as India's solar pioneer.
Engineering Solar Monitoring Without Internet — The Handheld Device Story
How Su-Kam engineered kilowatt-hour data collection for rural Tamil Nadu when there was no internet, no cellular data and no cloud.
From Tamil Nadu to Munich — How the Solar PCU Took India to the World Stage
How Su-Kam's Solar PCU went from a government pilot in Tamil Nadu to Intersolar Europe in Munich and markets in 90 countries.
From Village Darkness to Solar Light — How Su-Kam Electrified Rural India
How Su-Kam's Solar Awareness Team and dealer network brought solar power to forgotten villages across India.