Horizontal axis trackers simulation

[Grist]

Horizontal axis trackers simulation

With horizontal trackers (North/South one axis trackers), in the diagram losses PVsyst report, the overall gain of the Global incident irradiation in collector plane is much higher (+24%) than the simulation of tracker manufacturer (+14%) with the same weather data, with backtracking option and the same distance between trackers in south West of France.

I tried a simulation in an African city, and there is 20% overall gain of the Global incident irradiation in collector plane in Bamako whereas in South East of France (Marseille), there is 26.4% gain with backtracking option and the same distance between trackers.

Is it possible that PVsyst overestimate irradiation received on the tracker for French cities?

Thanks

Best regards

[André Mermoud]

The transposition model (and therefore the gain) is highly dependent on the diffuse fraction in your meteo data.

Please carefully check these values (in the Meteonorm data of PVsyst, you have 38.6% of diffuse in Bamako, and 35.2% in Marseille).

The transposition values given by PVsyst are usually considered as realistic.

Now we don't know how the manufacturer's data have been established.