The University of York compared panels capable of 1.5 kW and found that vertically mounted bifacial panels generally outperformed tilt mounted monofacial panels, by between 14-27% on a monthly basis, at least when surrounded by gravel, in the climate/altitude of that particular location.
The reason given is that vertically mounted systems capture a lot more indirect reflected sunlight from the surroundings, across a wider range of conditions.
The University of York compared panels capable of 1.5 kW and found that vertically mounted bifacial panels generally outperformed tilt mounted monofacial panels, by between 14-27% on a monthly basis, at least when surrounded by gravel, in the climate/altitude of that particular location.
The reason given is that vertically mounted systems capture a lot more indirect reflected sunlight from the surroundings, across a wider range of conditions.