Skip to main content
New · 30-year simulation

What’s worth buying long-term?

Enter offer prices for up to 10 PV modules and see which set produces the most energy at the lowest price — accounting for degradation, operating temperature, and installation type. In seconds.

1 Add modules
Pick up to 10 panels from the database and enter the per-unit price
2 Set conditions
Currency, temperature, installation type, optionally yield
3 Get report
LCOE, ranking, 30-year charts, and a shareable PDF
Simulation parameters
Realistic production-weighted average for temperate Europe: pitched roof, typical sub-panel ventilation. ~9% loss
Ground mount ~1100 kWh/kWp
Pitched roof (equator-facing) ~1050 kWh/kWp
Pitched roof (E/W) ~950 kWh/kWp
Pitched roof (other) ~950 kWh/kWp
Flat roof ~1000 kWh/kWp
Carport ~1050 kWh/kWp
Pergola ~900 kWh/kWp
Balcony ~750 kWh/kWp
Single-axis tracker ~1300 kWh/kWp
Estimated yield
1050 kWh/kWp/year
kWh/kWp/year
From PVGIS or your own measurements — leave empty for the installation type default.
Selected modules 0/10
Add at least 2 modules to compare

Pick from 20,000+ models in the database and enter offer prices.

1
Search a module
2
Enter price
3
Add another
Add at least 2 modules to run a simulation.
How we calculate LCOE
Annual yield

Panel Wp × baseline yield × temperature factor × degradation factor for the given year. Year-1 typically 2%, subsequent years 0.55%.

30-year yield

Sum of annual yields — kWh produced per panel over the analysis horizon. Higher = better long-term.

LCOE & scoring

LCOE = price / 30-year yield. The 0–100 composite score combines LCOE, lifetime energy, and warranty length.

Frequently asked questions

LCOE (Levelized Cost of Energy) divides the panel's price by its 30-year energy production. It tells you the real cost of every kWh that panel will produce — lower is better. Two panels at the same price can have very different LCOE because of degradation rates, temperature behavior, and warranty length.

The simulator uses datasheet values from each panel: first-year degradation (typically ~2%), annual degradation (~0.55%/year), and the temperature coefficient. It assumes a constant baseline yield and doesn't model weather or inverter losses, so treat the result as a relative ranking rather than an absolute energy forecast. For your specific site, override the baseline yield with a PVGIS estimate.

PV cells lose power as they heat up. The temperature coefficient (typically -0.30 %/°C) tells you how much. A panel running at 55°C — typical for a pitched roof in summer — produces about 9% less than its STC datasheet rating. The simulator factors this loss into every year of the 30-year horizon.

The 0-100 score is a weighted composite: 30-year energy yield (45%), LCOE (40%), and warranty length (15%). Each panel is normalized within the comparison set, so the leader scores closer to 100 and the worst panel scores closer to 10. The formula favors panels that produce more energy at a lower cost.

Yes, completely free, no account needed. Each report gets a permanent shareable link and a downloadable PDF. We only rate-limit at 100 reports per IP per week to prevent abuse.
Disclaimer. Simulation is simplified and indicative. Does not account for energy price inflation, inverter/installation cost, or local irradiance variation. Consult an installer before purchase.

Recently generated reports

Anonymous simulations from other users — click to see results
2 modules 57 minutes ago
  • JA Solar JAM66D46-730/LB 730 Wp 300 $
  • Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (730W bin) 730 Wp 230 $
View report PDF