If you're considering solar for your home or business in Kolkata, there are three decisions that shape everything else: which brand of panels and inverter to install, whether to go on-grid or off-grid, and how net metering and subsidy affect your final cost. Here's what each of those actually means.

Adani, Tata, UTL, or Luminous — how do they differ?

Ecospark installs systems from all four brands, and the honest answer is that none of them is universally "the best" — they differ mainly in panel technology, inverter warranty terms, and price positioning. Browsing the 3 kW Adani Power Solar System, 3.5 kW Tata On-Grid Solar System, 3 kW UTL On-Grid Solar System, and 3 kW Luminous On-Grid Solar System side by side is a reasonable place to start comparing current pricing. The right choice usually comes down to your budget and how long a warranty matters to you — it's worth asking for brand-specific warranty terms before deciding rather than assuming one brand is automatically better than another.

On-grid vs. off-grid: which one do you need?

Most homes and businesses in Kolkata go with an on-grid (grid-tied) system — it's what all of Ecospark's on-grid solar systems are built around. An on-grid system feeds any excess solar power back into the WBSEDCL grid and draws from the grid when your panels aren't producing enough (at night, for instance), which is why net metering matters — it's how those exported units get credited against your electricity bill.

An off-grid system instead stores excess power in batteries rather than sending it to the grid. It costs more upfront because of the battery bank, but it works independently of grid supply — useful if you're in an area with frequent outages or no reliable grid connection at all. For most Kolkata rooftops, on-grid is the more cost-effective choice unless backup during outages is a priority.

Beyond rooftop power: street lighting and solar pumps

Not every solar need is about powering a building. Housing societies and commercial premises often turn to solar LED street lighting (with a pole-mounted option also available) since it needs no grid wiring at all. For agricultural use, Ecospark's 3 HP solar pump system with panel runs the same way — independent of grid power.

WBSEDCL net metering — what it involves

If you install a grid-tied system, it needs to be registered with WBSEDCL for net metering so the units your panels export are credited against what you consume. The exact paperwork and approval timeline can change, so rather than list steps that might be outdated by the time you read this, the more reliable approach is letting your installer handle it — Ecospark manages the WBSEDCL registration as part of every on-grid installation, so you're not navigating it alone.

Rooftop solar subsidy (PM Surya Ghar Yojana)

Residential rooftop solar installations may qualify for subsidy support under central government schemes like PM Surya Ghar Yojana. Subsidy amounts and eligibility criteria are revised periodically, so the figures that were accurate a few months ago may not be current — the most reliable way to know what you actually qualify for is to ask directly during a site visit.

Getting started

If you're comparing options for a home or business in Saltlake or elsewhere in Kolkata, Ecospark Energy Solutions installs on-grid systems from Adani, Tata, UTL and Luminous, along with solar street lighting and agricultural solar pumps — reach out on WhatsApp or by phone for a site-specific quote and current subsidy guidance.