This page is about HDT and Advanced HJT solar-module selection. For a broad multi-brand buying comparison, including TOPCon, HJT, price-per-watt and subsidy criteria, read Best Solar Panel for Home in India: TOPCon vs HJT vs HDT.
HDT Solar Panel: Advanced HJT Bifacial Module
HDT (Heterojunction Dual-side Technology) is an Advanced HJT-based dual-side solar architecture engineered to optimise front- and rear-side optical response, surface passivation, current collection, bifacial energy yield and module-level performance.
HDT — Advanced HJT Dual-Side Architecture. The relevant comparison is not a generic brand ranking: it is whether a specific HDT module fits the project’s roof area, structure, string design, heat conditions, handling plan and warranty requirements. HJT Solar Panel, Bifacial HJT and N-Type HJT are useful technology terms, but engineering and purchase decisions should rely on the exact module’s current product record and data sheet.
Current Devsol HDT Module
The current top available HDT module in the Nexus/Devsol range is the Devsol 740W HDT Solar Panel. The legacy 730Wp HDT product is discontinued and must not be presented as the current flagship. The 740W product page publishes a 740W rated front-side power, 23.8% module efficiency, N-Type HJT cell platform, glass-glass bifacial construction, 90±5% bifacial factor and a -0.24%/°C Pmax temperature coefficient.
Those values should be compared with the site rather than treated as a universal generation promise. Module temperature rises above the 25°C standard test condition according to irradiance, mounting clearance, wind, roof surface and ambient conditions. The Pmax temperature coefficient describes the model’s published change in rated power for each degree of cell-temperature rise. Rear-side generation is likewise dependent on mounting height, tilt, rear shading and surface reflectivity.
What Bifacial Design Changes
A bifacial glass-glass module is designed to respond to light at both front and rear surfaces. Front-side nameplate power is the starting point. Rear-side response can add energy where the mounting design provides clearance and reflected light, but the actual result depends on the project. Light-coloured concrete, elevated structures and suitable row spacing can create a different rear-side environment from a module fitted close to a dark roof.
For a rooftop proposal, confirm the module dimensions, weight, mounting arrangement and roof loading before finalising a high-wattage module. The Devsol 740W HDT dimensions are 2384 × 1303 × 33 mm and the listed weight is 37.5 kg. A smaller-wattage module can be a more practical choice where lifting, access or roof geometry is constrained. The correct answer is the module that the project design can safely and electrically accommodate.
Warranty, Certification and Current Availability
The current 740W product record lists a 15-year product warranty and a 35-year linear performance warranty, subject to the applicable warranty terms. These are different commitments: the product warranty concerns manufacturing defects, while the performance warranty concerns specified output over time. Read the current terms and retain the model-specific paperwork with the final quotation.
ALMM application in process. Nexus/Devsol panels are not currently ALMM-listed, so they are not eligible for PM Surya Ghar subsidy. They are BIS registered under licence R-93046086.
The 740W model is listed on its product record as Nex-740-IN0825 under BIS licence R-93046086. Certification, commercial availability and applicable warranty should always be checked against the exact final model. The 580W e-rickshaw module is a separate mobility product and should not be treated as a category-wide certification example.
How to Specify an HDT Module
- Confirm the exact current 740W product record, quantity and lead time.
- Check roof structure, handling method, module dimensions and mechanical loading.
- Confirm string voltage/current and protection design with the selected inverter.
- Assess mounting clearance and rear-side shading before assuming bifacial benefit.
- Read product and performance warranty terms separately.
- Use the current solar-panel category for current listed prices and the broader guide for a multi-brand comparison.
Frequently Asked Questions
What is an HDT solar panel?
HDT — Advanced HJT Dual-Side Architecture. Use the locked definition above and the exact module product record for specifications.
Is the Devsol 740W HDT panel bifacial?
Yes. The product record lists glass-glass bifacial construction and a 90±5% bifacial factor. Actual rear-side contribution depends on the installation.
What is the temperature coefficient of the 740W HDT module?
The current product record lists -0.24%/°C for Pmax.
Where can I compare HDT with other solar-panel technologies?
Use the TOPCon vs HJT vs HDT guide for the broader multi-brand comparison, then return to the product page for model-specific HDT facts.