21 October 2026
The latest solar panel technology in India in 2026 comes down to four things you can actually buy: N-type TOPCon cells at 23 to 24% module efficiency, G12 and G12R wafers that push single modules past 700 W, 16 to 18 busbar cell interconnection, and glass-to-glass bifacial construction that collects light on both faces. Almost every new module leaving an Indian line this year combines all four.
Plenty of what gets sold as "latest technology" is not available here, or not at all. Heterojunction cells are in volume production abroad but barely present on Indian lines. Back-contact modules are a niche. Perovskite tandem cells hold the laboratory efficiency records and have no commercial module behind them. This guide separates what is shipping from what is a press release, and shows how to check any claim against the datasheet in front of you.
| Technology | Status in India, 2026 | Module efficiency | Can you buy it here |
| N-type TOPCon | The default on most new lines | 23 to 24% | Yes, widely |
| Mono PERC | Mature, still made in volume | 20 to 21% | Yes, widely |
| Glass-to-glass bifacial | Standard on TOPCon modules | Adds 5 to 25% energy, not efficiency | Yes |
| Heterojunction (HJT) | A handful of lines, mostly imported cells | 23 to 25% | Limited |
| Back-contact (IBC, xBC) | Imported, premium residential | 23 to 24.5% | Rarely |
| Perovskite tandem | Laboratory and pilot lines only | Record cells above 33% | No |
The gap between a record cell and a module you can bolt to a roof is wider than most coverage suggests. NREL's Best Research-Cell Efficiency chart tracks the laboratory records, and they run several years and several percentage points ahead of anything in production, because a record cell is a few square centimetres made under laboratory conditions while a module is 132 of them laminated to survive 25 years outdoors. The US Department of Energy's primer on photovoltaic efficiency sets out why cell and module figures differ. Treat any salesperson quoting a record cell efficiency for a module they are selling as quoting the wrong number.
TOPCon stands for tunnel oxide passivated contact. A thin oxide layer and a doped polysilicon layer sit between the silicon and the metal contact, which cuts the energy lost where those two meet. The cell is N-type rather than P-type, so it does not suffer light-induced degradation the way PERC does.
What that means on a datasheet:
| Specification | Mono PERC | N-type TOPCon | Why it matters |
| Module efficiency | 20 to 21% | 23 to 24% | More watts in the same area |
| First-year degradation | About 2% | About 1% | Output you keep |
| Annual degradation after year one | 0.55% or so | 0.4% or so | Compounds across 25 years |
| Temperature coefficient | Around -0.35%/°C | Around -0.30%/°C | Less loss on a 45°C afternoon |
| Bifaciality factor | 65 to 70% | 80% or so | More rear-side generation |
The temperature coefficient deserves more attention than it gets in India. Module ratings are measured at 25°C cell temperature. A rooftop in Rajkot or Jaipur in May runs far hotter than that, and the difference between -0.35 and -0.30 per degree is real energy on exactly the days when demand peaks. Our TOPCon solar panel guide works through the cell structure in detail, and the Mono PERC guide covers where the older technology still makes sense.
The second change is physical. Bigger wafers mean more watts per module, fewer modules per megawatt, and less mounting structure and labour for the same capacity. Three formats cover most of what is sold in India.
| Format | Cell size | Typical module output | Where it fits |
| M10R | 182 x 105 mm rectangular | 580 to 660 W | Rooftop, where module weight and width matter |
| G12R | 210 x 182.2 mm rectangular | 610 to 630 W | A narrower 1134 mm module, easier on constrained roofs |
| G12 | 210 x 210 mm | 725 to 745 Wp | Ground-mount and large C&I, best cost per watt |
Bigger is not automatically better. A 745 Wp G12 module is heavy and awkward for a two-person team on a residential roof, and its higher current needs cable and fuse sizing to match. For a factory roof or a ground-mounted plant, the same module cuts the number of mounting rails, clamps and connectors noticeably. Match the format to the site, not to the headline wattage.
A busbar carries current off the cell. Older modules used 5 or 9 of them; current TOPCon modules use 16 or 18 thin wires. Shorter paths mean lower resistance losses, and more wires mean a microcrack is less likely to isolate part of a cell, so the module degrades more gracefully as it ages.
Zero-busbar designs, where fine wires replace printed busbars entirely, are the next step and are starting to appear on imported modules. They use less silver, which matters because silver paste is one of the larger consumable costs in a cell line. If a datasheet does not state busbar count, ask. It is a reasonable proxy for how recent the line is.
Replacing the polymer backsheet with a second sheet of glass does two things. It lets the rear of the cell collect reflected light, and it protects the cell better from moisture, which is why glass-to-glass modules usually carry a 30-year product warranty against 25 for backsheet modules.
The rear-side gain is not a fixed number. It depends on what the module is looking at: roughly 5 to 10% over grass, 10 to 15% over concrete, and 20 to 25% over white membrane or sand. A module mounted flush against a dark rooftop gains close to nothing at all, which is the single most common mistake in bifacial specification. Our guide to bifacial solar panels covers the physics, and the TOPCon vs bifacial comparison settles the question people most often get tangled in: these are not competing technologies, they are a cell choice and a construction choice.
Heterojunction. HJT cells sandwich crystalline silicon between thin amorphous silicon layers. They reach 23 to 25% module efficiency with an excellent temperature coefficient near -0.26%/°C and very low degradation. They also need a different production line from TOPCon, more silver, and lower-temperature processing. Indian manufacturers have overwhelmingly put their capital into TOPCon lines instead, so HJT modules here are mostly imported and priced accordingly.
Back-contact cells. Moving all the contacts to the rear removes the shading from front-side busbars and looks clean on a residential roof. It is a premium imported product in India, and the efficiency gain over good TOPCon is small enough that the price difference rarely pays for itself on a commercial project.
Perovskite tandem. A perovskite layer stacked on silicon has pushed laboratory cells past 33%, and the Fraunhofer ISE Photovoltaics Report tracks how far ahead of production those numbers sit. The unsolved problem is lifetime: perovskite layers degrade under heat and humidity in months to a few years, against the 25 years a module has to survive on an Indian roof. Pilot lines exist. Bankable modules do not. Anyone offering you perovskite modules in 2026 is selling something else.
The premium is smaller than most buyers expect. Non-DCR Mono PERC has been selling at roughly Rs 13.8 per watt and non-DCR TOPCon at about Rs 14.2 per watt, a gap of under half a rupee. For 8 to 12% more energy across 25 years, that is the easiest specification decision in the whole system.
The decision that moves real money is domestic content. DCR TOPCon has been selling around Rs 22.3 per watt, a premium of roughly 55% over non-DCR, because both cell and module must be made in India. Government schemes require it, open-access and most C&I projects do not. Our breakdown of the cost of a 1 MW solar plant shows what that premium does to a project budget line by line.
Two 2026 policy changes sit underneath these numbers. GST on solar cells, modules and solar power generating systems fell from 12% to 5% in September 2025, taking about 5% off project capex. And from 1 June 2026, projects under the MNRE ALMM framework must use modules built with cells from the List-II approved list, which has tightened domestic cell supply.
Ask for the datasheet and read six lines. Everything else is marketing.
Credence Solar builds N-type TOPCon modules in M10R, G12R and G12 formats at a 2.2 GW automated plant in Rajkot, from 580 W up to 745 Wp, with glass-to-glass bifacial construction and BIS, CE, ISO, TUV, UL and IEC certification. Every specification above is on the datasheets, including the lines most brochures leave out.
The latest solar panel technology in India in 2026 is N-type TOPCon on large-format wafers with many busbars and glass-to-glass bifacial construction, at a premium of well under a rupee per watt over Mono PERC. HJT and back-contact remain mostly imported, and perovskite tandem is a laboratory achievement rather than a product. If you check cell type, module efficiency, temperature coefficient, degradation, bifaciality and the ALMM listing on the actual model being quoted, you will know exactly which generation of technology you are buying.
For module specifications or bulk pricing on current TOPCon formats, talk to our team.
N-type TOPCon cells on G12 or G12R wafers, with 16 to 18 busbars and glass-to-glass bifacial construction. That combination gives 23 to 24% module efficiency and module ratings up to 745 Wp. It has replaced Mono PERC on most new Indian production lines, while HJT and back-contact cells remain largely imported.
Among modules you can actually buy here, N-type TOPCon leads at 23 to 24% module efficiency, with heterojunction reaching 23 to 25% where it is available. Laboratory perovskite tandem cells exceed 33%, but no commercial perovskite module exists because the layer degrades long before 25 years.
In most cases, yes. The module price gap has narrowed to roughly Rs 0.4 per watt between non-DCR Mono PERC and non-DCR TOPCon, for 8 to 12% more energy over 25 years, lower degradation and a better temperature coefficient. The exception is a project with plenty of space and a hard upfront budget ceiling.
Modules of 725 to 745 Wp built on G12 N-type TOPCon cells with glass-to-glass bifacial construction. Credence Solar makes BIS-certified modules up to 745 Wp at its Rajkot plant. Higher ratings exist in prototypes, but 745 Wp is the practical ceiling for modules you can buy and get certified in India today.
No. Perovskite tandem cells hold laboratory efficiency records above 33%, and pilot lines are running internationally, but the perovskite layer degrades under heat and humidity far faster than the 25-year life a module needs. No bankable perovskite module is sold anywhere, and any offer of one in India should be treated as a warning sign.
Ask for the datasheet of the exact model number and check six lines: cell technology stated by name, module efficiency, temperature coefficient of Pmax, first-year and annual degradation, bifaciality factor, and the BIS registration number with ALMM listing. Then confirm that model on the MNRE ALMM list, because brands often have some models listed and others not.
