kjs55

During system downtime due to "unavailability in the system" (new loss in PVsyst V6), the external transformer losses remain proportional to the square of the current even though the system is not operating and no current is flowing (open-circuit). I think the external transformer losses should be constant (not irradiance-dependent) when the system is not operating. I think this indicates that there is a bug (e.g. the transformer loss is calculated and applied before taking into account the system is down).

Operating PVsyst V6.12 It is also unclear what the categories "Mixed", "In length", and "In width" actually mean. It would be helpful if a brief description of the terms was added to the Help menu.

Operating PVsyst V6.12 It is uncertain whether the negative energy values correlate with the randomized dates / times when the systems is not operational. It appears that summing the 8760 hourly energy values (both positive and negative) in Excel yields the same annual value as what is reflected in the PVsyst output report. I would have expected energy production to be zero during the times when the system is not operating (not negative). Please advise as to whether this is a bug or not.