Author name: Kunwer Sachdev

The Su-Kam Colossal 1P 10 KVA Solar PCU: a storage-first solar inverter for India’s commercial loads, with IGBT, DSP and a PWM charge controller.

The Colossal was born in 2008 as a high-capacity inverter to replace the generator. Then Su-Kam built an in-built solar charge controller into the same machine — and it became a Solar PCU.

How Su-Kam’s DT-6S six-stage charging — desulphation, soft start, bulk, absorption, equalization, float — extends inverter battery life. The charging software that built a brand.

Why an inverter beats a diesel generator — and how Kunwer Sachdev built India’s first 5 KVA & 10 KVA inverters at Su-Kam, told through the Hindi film he scripted to convince dealers and customers.

Solar was expensive and there were no subsidies. While others demonstrated it, Kunwer Sachdev commercialised solar — putting it on rooftops, in villages, and across 90+ countries.

Kunwer Sachdev on the mission that drives him today — making clean, affordable solar energy available to every Indian household, and how what he once argued for alone is now national policy.