Colossal 1P 10 KVA Solar PCU: the 10 KVA nobody believed in — now running on the sun
The single-phase 10 KVA was the inverter the whole industry said couldn’t exist. We built it on IGBT and DSP — then we put solar inside it and made it a Power Conditioning Unit.
One floor-standing machine. Ten kilovolt-amperes of clean power. And it answers to the sun first.
When we first built the single-phase 10 KVA Colossal, people in the industry simply did not believe a 10 KVA inverter was a real, sellable product. It was too big an idea. We built it anyway — on IGBT power switching controlled by a DSP, giving a true pure sine wave output clean enough for the most sensitive loads. The Colossal you see in the video is exactly that: a heavy, floor-standing unit on castors, with an LCD that tells you everything the machine is doing.
Then we did the thing that changed its purpose entirely. We built an in-built solar charge controller into it — and the Colossal 10 KVA stopped being only an inverter. It became a Solar PCU: a single box that takes power from your solar panels, your batteries and the grid, and decides intelligently which to use.
1 Why storage — not grid-feed — was the only answer
We built the 10 KVA Solar PCU for the commercial market, and we built it for the India of that moment. When this was designed, grid-feed solar inverters were not yet dominant — and for good reason. Power cuts were so frequent and so long that feeding solar back into an unreliable grid made little sense. What people actually needed was solar with storage: capture the sun, store it in batteries, and ride straight through the outages. For that, a Solar PCU was the only real answer.
And a true Power Conditioning Unit is not a solar panel bolted onto an inverter. The Colossal 1P 10 KVA manages three power sources at once and prioritises the sun:
Solar charge controller
Harvests the panels and charges the 180V battery bank.
Inverter
The IGBT + DSP pure sine wave core, running the full 10 KVA load.
Grid charger
Falls back to the mains only when solar and battery aren’t enough.
2 The honest first step: PWM, not MPPT
I’ll be candid about the engineering. We first built this Colossal Solar PCU with a PWM solar charge controller — not because PWM was the final ambition, but because at this size we had not yet been able to develop an MPPT solar charge controller capable of handling a 10 KVA machine. So we shipped what worked, reliably, first — putting a real storage Solar PCU into commercial hands while the technology to do better was still being built.
3 Built for the load a generator used to carry
Ten KVA, single phase, is serious power — a large home, a shop, a clinic, a small commercial setup. That was traditionally diesel-generator territory. The Colossal 10 KVA Solar PCU took that same load and ran it on a clean, silent, solar-first machine, with the LCD on its front giving the owner full visibility into battery charge and system health.