Decide whether a solar project pays off, and present it to your client.
For commercial and industrial consultants and installers: expected generation from PVGIS data, cash flow, NPV, IRR, payback and LCOE, scenarios side by side and a report ready to send. Without rebuilding the spreadsheet for every proposal.
Why Voltperia
Generation is the start. The decision is financial.
Your client isn't buying kWh: they're buying a return. Voltperia joins the generation estimate with the project's economics, so every proposal answers what the client asks: what it costs, when it pays back and what happens if the assumptions change.
NPV · IRR · LCOE
plus simple and discounted payback, for every scenario
Side by side
alternative sizes, investments and tariffs in one table
PDF + Excel
with your brand and the financial model as formulas
The exported Excel recalculates the cash flow from the same assumptions and gives the same results as the platform.
Honest about what it calculates.
Voltperia calculates the value of the energy generated with the tariff and self-consumption you enter, and says so. Actual savings depend on the load profile, the tariff structure and export compensation: we don't make them up when that data is missing.
Methodology
Public data, a verifiable model and assumptions in plain sight.
Generation starts from the PVGIS typical meteorological year, from the European Commission's Joint Research Centre, with irradiance transposed to the module plane, incidence-angle losses and the PVGIS power model. Against the official PVGIS calculator, at six sites in Spain, Mexico and Argentina, the performance ratio differs by 0.4% to 1.5%. The financial model is standard and transparent: every indicator can be traced back to its formula.
PVGIS
Joint Research Centre · European Commission
Typical meteorological year with satellite irradiance (SARAH2, NSRDB) or ERA5 reanalysis, depending on the region.
Physical model
The same one PVGIS uses
Hay-Davies transposition, incidence-angle losses and Huld efficiency with Faiman module temperature.
Open financial model
Traceable
Nominal cash flow with degradation and escalations; NPV, IRR, payback and LCOE as formulas you can inspect in the Excel.
How it works
From site to proposal, in minutes.
Place and size it
Mark the site on the map and enter the system size. We simulate a typical year's generation with PVGIS data.
Evaluate the economics
Enter investment, O&M, tariff and discount rate. Cash flow, NPV, IRR, payback and LCOE update instantly.
Compare and present
Create alternative scenarios, see which assumption matters most and download the client report as PDF or Excel.
The product
Every alternative of the project, with its numbers.
Who it's for
For those who evaluate and sell solar projects.
Energy consultants
Consistent, reusable feasibility studies with explicit assumptions and a report that needs no layout work.
Commercial and industrial installers
Proposals with payback, IRR and sizing alternatives in minutes, under your brand, to close sooner.
Engineering firms and developers
Fast pre-feasibility of candidate sites before commissioning the detailed study.
Pricing
Start free. Upgrade when proposals carry your brand.
Free
Evaluate your first projects with the full analysis.
- 3 projects with up to 3 scenarios each
- Expected generation, cash flow, NPV, IRR, payback and LCOE
- Scenario comparison and sensitivity
- PDF report
Business
RecommendedFor consultants and installers who send proposals every week.
- Unlimited projects. Your whole study history, reusable.
- Branded reports. Your logo, colour and contact details on the PDF and Excel.
- Excel with formulas. The full financial model, editable.
- Up to 10 scenarios per project
- Up to 10 users on your account
- Operating installation monitoring (up to 3)
Enterprise
For teams with a high volume of projects.
- Everything in Business
- Up to 25 scenarios per project
- Up to 20 users on your account
- Unlimited installation monitoring, CSV export and CO₂ emissions
No lock-in or long-term commitment. Cancel anytime.
FAQ
Before you start
What do I need for a first result?
The site location and the system size. With that we simulate generation and, with reference financial assumptions, you already see a cash flow. Those assumptions stay flagged until you enter the project's own: investment, O&M, tariff and discount rate.
How accurate is the generation?
It's a P50 estimate from the PVGIS typical meteorological year, using the same power model as PVGIS: against its official calculator, the performance ratio differs by 0.4% to 1.5%. A given year can land somewhat above or below, and the model doesn't know about near shading or inverter clipping.
Do you calculate bill savings?
No, and we say so explicitly. We calculate the value of the energy generated with the tariff, self-consumption and export price you enter. Actual savings require the client's load profile, the full tariff structure and the compensation scheme.
Can I keep working in Excel?
Yes, on paid plans. The exported Excel has each scenario with assumptions in editable cells and the cash flow, NPV, IRR, payback and LCOE as formulas: change an assumption and everything recalculates.
Does it cover my country?
Practically any point on land: PVGIS has global coverage. Amounts are entered in the project's currency (USD, EUR, MXN, BRL, CLP, COP and others).
Is my data private?
Yes. Only your account can see your projects; we don't share or sell them. You can delete your account and all its data from Settings.
Can I cancel anytime?
Yes. Plans are monthly with no lock-in. Cancel from Billing and keep the plan until the end of the paid period; after that the account moves to Free without losing your projects.
Does your next project pay off?
Start with expected generation: location and size, no sign-up.
Calculate free