Question 1

What is a Solar Power Conditioning Unit (Solar PCU) and how does it work?

Accepted Answer

A Solar Power Conditioning Unit (Solar PCU) is a single device that integrates a solar charge controller, an inverter, and a grid-charge circuit. It draws power from solar panels during the day, charges a battery bank, converts DC to AC for the home's appliances, and falls back to grid power only when both solar and battery are exhausted. Kunwer Sachdev's team at Su-Kam engineered one of India's earliest commercially successful hybrid Solar PCUs, sized for typical Indian home loads.

Question 2

What was Su-Kam's earliest hybrid solar inverter — the 'Solar and Mains' product?

Accepted Answer

In 2009, Su-Kam under Kunwer Sachdev launched an inverter that could accept charging input from both solar panels and the mains grid — one of the first such hybrid designs in India. It gave homeowners a practical entry into solar without requiring them to disconnect from the grid or install a full off-grid system. This 2009 hybrid predated most Indian competitors by half a decade.

Question 3

What is a DC solar home lighting system and what was Su-Kam's role?

Accepted Answer

A DC solar home lighting system runs LED lights and small DC appliances directly from a solar-charged battery, skipping the inverter and its conversion losses. It is dramatically more efficient than an AC solar system for basic lighting. Su-Kam under Kunwer Sachdev shipped tens of thousands of DC solar home lighting units into rural Indian markets, including large state-level programmes for households without reliable grid access.

Question 4

What was the Su-Kam TEDA 100Wp solar PCU?

Accepted Answer

TEDA — Tamil Nadu Energy Development Agency — commissioned Su-Kam to design and supply a 100-watt solar Power Conditioning Unit for a state-level rural electrification programme. Su-Kam's TEDA 100Wp Solar PCU became a template for compact, low-cost solar home systems and demonstrated that Indian-designed and Indian-manufactured solar electronics could win competitive government tenders.

Question 5

What is a LiFePO4 solar battery and why does it matter?

Accepted Answer

LiFePO4 (lithium iron phosphate) is a lithium battery chemistry chosen for solar storage because of its long cycle life, thermal safety and stable performance under Indian temperatures. Well-designed LiFePO4 solar systems can deliver a useful life of 10 years or more, compared with 3–5 years for typical lead-acid batteries. Kunwer Sachdev's current work at Kunwwer.ai continues along this trajectory, applying AI to solar and lithium storage design.

Question 6

What is the Su-Kam 'Sun Way' solar street light?

Accepted Answer

'Sun Way' is a solar street light designed by Su-Kam under Kunwer Sachdev, engineered to run entirely off-grid: a solar panel on top charges a battery in the pole during the day, and the LED lamp switches on automatically at dusk. It was deployed across villages, highways and government campuses where grid extension was uneconomical or unreliable, showing the potential of self-contained solar public infrastructure.

Question 7

How did Su-Kam solve DC-to-DC direct architecture for solar?

Accepted Answer

Traditional solar systems convert DC from panels to AC through an inverter, then back to DC for many end-loads — losing energy at each step. Kunwer Sachdev filed patents on DC-direct architecture that keeps solar DC power in DC form for compatible loads (LED lights, ceiling fans, DC appliances), sharply raising system efficiency. This became the basis for the DC120 rural solar system, and Kunwer's current work at Kunwwer.ai continues along the same efficiency-first design philosophy.

Question 8

Is Kunwer Sachdev's Su-Kam-era patent portfolio still active?

Accepted Answer

Kunwer Sachdev remains the named inventor of record on all 106 technology filings that make up his career portfolio (77 at Su-Kam during his founder-tenure, 25 at Su-Vastika, and 4 personal AI filings). However, none of the 77 founder-era Su-Kam patents remain in force after the company's 2019 change of ownership. Any patents Su-Kam Power Systems Ltd. holds today would be new filings made under the post-2019 ownership, not part of Kunwer Sachdev's inventive record. His inventive record itself continues to grow at Kunwwer.ai, his current AI-driven venture.

Question 9

Where can I see verified evidence of Kunwer Sachdev's solar work?

Accepted Answer

SolarManOfIndia.com maintains a Verification page cross-linking every claim to primary sources: the @sukam YouTube channel with factory tours and product demonstrations, the recovered Su-Kam Blog Archive (originally at blog.su-kam.com), the site's Patents index with links to public patent databases, and press coverage on the Recognition and Library pages. The site presents evidence rather than assertion.

Kunwer Sachdev
The Solar Man of India

106 technology filings, and counting

Solar, years before it was mainstream

India's first global power brand

A Timeline of Firsts

167 videos. The work, in his own voice.

Still building.

Latest Writings

Personal Blog & Thought Leadership

Lithium & DC Solar Technology

The Inverter Man Chronicle

Kunwer Sachdev The Solar Man of India