Solar & PV Engineering Consultancy in Bangladesh
Leading Rooftop Solar PV Design & Engineering Consultancy in Bangladesh
As Bangladesh accelerates toward a renewable energy future, Triangle Engineers Ltd. (TEL) delivers end-to-end solar PV system design and engineering consultancy services — precision-engineered for Bangladeshi conditions, compliant with SREDA guidelines, BREB/DESCO/DPDC net metering frameworks, and BNBC 2020 standards. With over 12 years of multidisciplinary engineering expertise, we bring the same rigour to solar design that we bring to MEP, fire safety, and green building consultancy.
Whether you are a homeowner, a factory owner in a BSCIC industrial estate, or a hospital administrator planning energy independence — TEL designs a solar system that is safe, efficient, grid-ready, and built to last.
Why Choose TEL for Solar System Design?
- SREDA & Net Metering Compliance — Every design follows Bangladesh's updated 2025 Net Metering Guidelines issued by SREDA, ensuring smooth BREB, DESCO, DPDC, and NESCO approval
- Authority Liaison Support — We manage documentation and application submissions for net metering approval on your behalf
- Multi-Disciplinary Expertise — Our integrated MEP + structural + electrical team handles rooftop loading analysis, cable routing, and earthing as a unified solution
- AutoCAD & BIM-Based Drawings — All design deliverables are precision-drafted in AutoCAD and BIM for accuracy and contractor-ready execution
- Customised System Sizing — We calculate your exact load, roof area, orientation, and shading to optimise panel count, inverter sizing, and string configuration
- 12+ Years of Engineering Trust — A proven track record across residential, commercial, industrial, healthcare, and educational projects in Bangladesh
Our Solar System Design Services
1. Rooftop Solar PV System Design
We provide complete rooftop photovoltaic (PV) system design, covering system feasibility, energy yield analysis, and full engineering documentation. Our designs account for Bangladesh's solar irradiance profile, monsoon wind loads, and building structural constraints to deliver the most efficient and durable system for your rooftop.
2. Solar Panel Layout Plan
TEL produces detailed rooftop solar panel layout drawings showing exact panel positioning, row spacing for optimal shading avoidance, inter-row distances, and maximum roof utilization — all drafted to scale in AutoCAD & Revit.
3. PV Panel Structure Design
We design the mounting structure for solar panels adapted to your roof type — flat concrete rooftop, corrugated metal sheet, or pitched roof. Structural calculations ensure the mounting system withstands Bangladesh's wind speed and seismic requirements per BNBC 2020, ensuring long-term safety and performance.
4. Solar Panel String Connection Diagram
TEL delivers detailed string connection diagrams showing how panels are grouped into strings, string-to-inverter wiring, maximum power point tracking (MPPT) channel allocation, and open circuit voltage calculations to avoid inverter overvoltage.
5. Solar Panel Earthing Connection Diagram
All PV systems designed by TEL include a dedicated earthing connection diagram for the solar array — covering panel frame earthing, mounting structure earthing, inverter protective earth, and surge protection device (SPD) connections — compliant with IEC 62305 and BNBC electrical safety standards.
6. Cable Tray Layout Design
We design the complete cable tray and conduit routing plan for DC and AC cables from panels to inverter, inverter to distribution board, and interconnection to the utility grid meter. The layout minimises cable lengths, avoids heat build-up, and is coordinated with the building's existing MEP infrastructure.
7. Walkway Layout Diagram
For safe maintenance access, TEL designs rooftop walkway layout diagrams showing dedicated maintenance pathways between panel rows, safety guardrail positions, and rooftop access points — ensuring your O&M team can safely inspect and clean the system without damaging panels or the waterproofing membrane.
8. Single Line Diagram (SLD) for Solar System
Our single line diagrams (SLD) document the complete electrical architecture of your solar system — from PV array, DC isolator, inverter, AC isolator, generation meter, bidirectional utility meter (for net metering), and connection to the main LV distribution board. The SLD is a mandatory document for authority approvals and is prepared per IEC and local BERC/SREDA requirements.
9. Net Metering System Design
Bangladesh's updated 2025 SREDA Net Metering Guidelines now allow 100% of sanctioned load capacity and include both single-phase and three-phase consumers. TEL's net metering system design covers bidirectional meter specification, protection relay settings, grid interconnection diagrams, and full preparation of the application package required by BREB, DESCO, DPDC, or NESCO — helping you start earning from your excess solar energy quickly.
Target Sectors
Sector | Application |
Residential | Apartment buildings, private homes, housing societies — reduce monthly DESCO/BREB bills and qualify for net metering |
Commercial | Shopping malls, office towers, hotels, garments factories — offset peak-hour demand charges and reduce diesel genset runtime |
Industrial | Factories, warehouses, export processing zones — lower production energy costs with large-scale rooftop PV systems |
Healthcare | Hospitals, clinics, diagnostic centres — ensure reliable, low-cost power backup and reduce grid dependency for critical loads |
Educational | Schools, colleges, universities — demonstrate sustainability leadership while significantly reducing campus utility costs |
At Triangle Engineers Ltd. our services include:
- Rooftop Solar PV System Design
- Solar Panel Layout Plan
- PV Panel Structure Design
- SLD for Solar System
- Net Metering System Design
Frequently Asked Questions
What is net metering and can my building qualify in Bangladesh?
Net metering allows you to feed unused solar electricity back to the grid and receive payment or bill credit. Under SREDA's 2025 guidelines, all consumers — including single-phase households — with BREB, DESCO, DPDC, or NESCO connections are now eligible, up to 100% of their sanctioned load.
Does TEL handle only design, or also installation?
TEL is an engineering design and consultancy firm. We provide the complete engineering design package and authority approval support. Installation is executed by your chosen contractor using our contractor-ready drawings.
What documents will I receive in the design package?
You will receive: Solar panel layout plan, PV structure design drawings, string connection diagram, earthing diagram, cable tray layout, walkway layout, single line diagram (SLD), net metering application drawings, and system sizing report.
How long does the solar design process take?
A typical residential to mid-size commercial project design is completed within 10–20 working days after site data submission, depending on project complexity.
Is the design compliant with BNBC 2020 and SREDA guidelines?
Yes. All TEL solar designs are prepared in accordance with BNBC 2020, SREDA's Net Metering Guidelines 2025, IEC 62305 (surge protection & earthing), and IEC 60364 (electrical installation standards).
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03/12/2025