Solar Design & Engineering Platform for EPCs

Design, engineering and business

Plan, visualise, analyse and engineer rooftop solar projects using 3D design and electrical workflows, then connect your designs with quotations, project execution, inventory and business operations.

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3D view of a multi-storey house in RAYVO with the specific yield heat map in kWh per kWp per year on every roof and panel table

Capabilities

What it does, how, and what you get

Each capability below says what it does, how it is worked out, what it produces and why it matters to installers and EPC companies.

3D rooftop modelling

What it does: Draws the building as it stands: any outline, flat, gable, shed and hip roofs, L, T and U shapes, wings, upper storeys, parapets and everything standing on the roof.
How it works: Trace the roof over satellite imagery, set heights and pitch, then add water tanks, stair rooms, AC units, trees and neighbouring buildings.
What you get: A true-scale 3D model that the layout, shading and structure all work from.
Why it matters: Every later number (keep-out areas, shadows, cable runs) is only as good as the model of the roof.

Panel layout

What it does: Places module tables on each roof face with tilt, spacing and one grid direction for the whole design.
How it works: Auto-fill a roof or place tables by hand, on the grid or anywhere; rotate or slide the whole array.
What you get: Module count, kWp, tilt and facing per table, ready for strings and the bill of materials.
Why it matters: Capacity is decided on the roof, not in a spreadsheet; the layout respects tanks, parapets and setbacks.

Sun path and shadow analysis

What it does: Shows the real sun path for any day and works out year-round shading from the 3D scene.
How it works: The sun is swept across the 21st of every month in half-hour steps and every module is checked against everything that can block it.
What you get: Shading loss per table and per month, solar access, and five roof heat maps.
Why it matters: A parapet or a water tank can cost a string a tenth of its yield; the design shows where before the panels go up.

Electrical design

What it does: Sizes the inverter, strings the modules and sizes DC and AC cables and protection.
How it works: Module datasheet values and the site's coldest and hottest temperatures set the string window; cable sizes follow voltage drop and current.
What you get: Inverter count and phase, strings per MPPT, cable sizes and lengths, DCDB, ACDB, earthing and lightning protection.
Why it matters: Strings outside the inverter's voltage window trip on a cold morning; undersized cables waste energy every day.

Automatic single line diagram

What it does: Draws the SLD of the system from the design: strings, DCDB, inverter, ACDB, net meter, grid and earthing.
How it works: Generated from the same string plan and bill of materials, so it changes when the design changes.
What you get: A printable SLD (SVG and A3 PDF) with ratings, cable sizes and a title block.
Why it matters: DISCOM files and site teams need a diagram that matches what is actually being installed.

CAD / DXF export

What it does: Exports the roof plan with the PV layout as a DXF drawing.
How it works: True scale in metres with separate layers for roofs, parapets, obstructions, trees, neighbours, tables, modules, labels and north.
What you get: A DXF file that opens in AutoCAD, BricsCAD, LibreCAD and DraftSight.
Why it matters: Structural and electrical consultants work in CAD; they get the layout without redrawing it.

Generation and yield

What it does: Estimates annual and monthly generation from the site's climate record and the layout.
How it works: PVGIS climate data transposed onto each roof plane, with shading from the 3D scene applied.
What you get: Annual kWh, kWh per kWp, month-by-month production and performance ratio.
Why it matters: Savings, payback and the customer's trust all start from a generation figure that can be explained.

Design to quotation

What it does: Turns the design into a priced proposal and connects it to the rest of the business.
How it works: The bill of materials is measured from the design and priced from your rate card; the proposal and quotation carry its total.
What you get: A branded proposal PDF, numbered quotation versions, then projects, inventory and invoices in RAYVO.
Why it matters: The price, the material list and the installation all come from one design, so nothing is re-typed.

In the product

What the outputs look like

Screens from the RAYVO 3D Design Studio, pages from its proposals, and sample drawings marked as illustrations.

RAYVO 3D Design Studio: top view of a sample house with a flat terrace, parapet, water tank and stair room, solar panel tables on the terrace and pitched roofs — A sample design: terrace with parapet, water tank and stair room, panel tables placed around them.

Annual sunlight heat map on a rooftop in RAYVO: kWh per square metre per year on every roof surface, with the shadow of the parapet, water tank and stair room visible — Annual view: sunlight per square metre per year, from the site's climate record and the drawn 3D scene.

Shading loss heat map in RAYVO: the percentage of yearly sunlight lost to shade on each part of the roof — Shading view: share of the year's sunlight lost to shade, point by point.

Single line diagram of a 6.54 kWp grid-connected rooftop solar system: two PV strings, DCDB with string fuses, DC isolator and SPD, 5 kW single-phase inverter, ACDB with 28 A MCB and SPD, bi-directional net meter and grid, with earthing pits — Sample single line diagram for a 6.54 kWp home (illustration).

Roof plan opened in a CAD program: terrace outline, parapet line, water tank and stair room, six PV tables with 48 module rectangles, labels and a north arrow on separate layers — Sample roof plan as it opens in a CAD program, layer by layer (illustration).

Proposal page: annual production, yield, performance ratio, shading loss and the roof layout of a solar design — Proposal page: your system.

How it works

Four steps on one design

1
Model
Trace the roof, its levels and every object on it.
2
Lay out
Place tables, set tilt, spacing and grid direction.
3
Engineer
Check shading, strings, cables, wind and yield; get the SLD and DXF.
4
Quote and build
Send the proposal, then run the project, stock and billing in RAYVO.

Technical detail

The methods behind the numbers

Design-stage figures from recognised methods. Final structural and electrical designs are signed by licensed engineers.

Roof types	Flat (RCC terrace), gable, shed and hip, any outline, wings and upper storeys
Rooftop objects	Water tanks, stair room (mumty), AC units, solar water heater, dishes, vents, skylights, parapets
Shading	Sun swept on the 21st of every month, half-hour steps, every module ray-cast
Climate data	PVGIS monthly global and diffuse irradiation
Electrical	Temperature-adjusted string sizing, MPPT window, DC/AC ratio, cable sizing by voltage drop
Structure	Wind speed from IS 875 (Part 3) for Indian sites, member-by-member steel take-off
Drawings	Single line diagram (SVG, A3 PDF); roof plan (DXF R12, metres, layered)
Business	Proposal PDF, quotation versions, CRM, projects, inventory, invoices, payroll

FAQ

Solar Engineering Platform questions

Both, on one account. The 3D Design Studio does the roof model, layout, shading, electrical design and drawings; the CRM and ERP run leads, quotations, projects, inventory, invoices and payroll. The design's bill of materials and price carry into the quotation.

No. Everything runs in the browser, on a laptop or a phone. If your consultants use CAD, the roof plan exports as a DXF file they can open directly.

They are design-stage figures worked out from the drawn site and recognised methods. A structural engineer still designs the actual roof structure, and a licensed electrical engineer approves the final single line diagram for the DISCOM.

The design studio works for any address with satellite imagery and climate data. Indian sites get IS 875 wind speeds, DCR and non-DCR module pricing and PM Surya Ghar subsidy rules; other markets use their own currency and tariffs.

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