A solar feasibility study should come from a real layout plan, not from assumptions typed into a spreadsheet. SolarSimPro builds the financial model on top of the design: module count, DC capacity and yield estimate come from the plant you drew, the bill of materials is derived from that capacity, and the cash flow from that bill.
The most common mistake in practice is estimating capital cost from installed capacity with a rough unit price per kWp. That roughly holds on small roofs; on land it does not: the same 1 MW costs one thing on a flat site and something quite different on a site with 8% slope and two valleys. Table count, cable sizes and lengths, transformer rating and even cut-and-fill volumes all depend on the geometry of the layout.
In SolarSimPro the feasibility step is not at the end of the workflow but inside it . Steps 05 Materials and 06 Feasibility read the module layout, the shading loss and the hourly yield curve produced up to that point. Change a single row spacing in the design and the payback period changes with it — there is no manual transfer between two files.
Totalled from a bill of materials in ten categories: modules, mounting structure, inverters, AC/DC cabling, transformer and MV, earthing, installation labour, infrastructure, design and approvals, and overheads.
Annual yield from the hourly simulation, spread over 25 years with the performance ratio and annual degradation. P50 and P90 are given together.
Consumption is entered hourly, monthly or annually; for an annual figure a regime — office hours, shift work, residential, irrigation, cold storage or hotel — is chosen and the total distributed across 8,760 hours. Self-consumption and exported surplus are reported separately.
Simple and discounted payback period, net present value (NPV), internal rate of return (IRR), levelised cost of energy and capital cost per kWp.
A 25-year cumulative cash-flow chart with year-by-year revenue, operating cost, insurance and inverter replacement.
From the same model the software produces a client-ready proposal and a percentage-weighted summary of work items for progress payments.
The list builds itself from DC capacity, module count, inverter count and table arrangement. A few examples: inverters are sized from total AC power, AC cable cross-section from the output current of each inverter individually rather than the plant total, trafo is selected by adding a 10% margin to the AC power and rounding up to the next standard kVA rating.
The quantity and unit price of every line can be edited by hand; a price you change is written to your own database and suggested on later projects. You can add or remove lines, pick from a categorised pool, or write your own item. Prices are held in Turkish lira; when the currency is changed they are converted at the current central bank rate , so the report shows one single truth whichever currency it is opened in.
| Input | Where it comes from |
|---|---|
| Module count and DC capacity | From the layout plan (roof geometry, or site boundary plus table arrangement) |
| Annual yield | From the hourly simulation, with shading loss already deducted |
| Material items | Automatically from DC/AC capacity; items and prices can be edited |
| Consumption profile | Hourly data, or annual consumption distributed by the selected regime |
| Tariff and finance | Electricity unit price, escalation rate, discount rate and operating cost |
The workflow follows the real order of a plant project. Each step reads the previous step's output, and no data is entered twice.
If the site or roof is ready, a typical pre-feasibility comes out in a single session, in about half an hour. What determines the time is not the software but how clear your consumption and tariff data is.
Consumption can be entered hourly, monthly or annually. For annual or monthly input you choose a regime — office hours, shift work, residential, irrigation, cold storage or hotel — and the total is distributed across 8,760 hours. You then choose hourly or monthly netting.
Yes. The quantity and unit price of every item can be edited, and items can be added or removed. Prices you enter are saved to your own database and suggested on later projects.
The report is produced as HTML that opens in the browser, and a PDF can be downloaded from the same page. The bill of materials and coordinate tables can also be exported as CSV.
Currency conversions use the current central bank rate. Prices are stored in Turkish lira; the report is shown in the selected currency, and the rate and date are stated in the report.
No installation — it runs in the browser. Write to us for a live session on your own project.