The most efficient tilt for photovoltaic panels in Fargo, North Dakota at a latitude of 46.87°:
Your photovoltaic panels need to be angled facing south.
If you're mounting the photovoltaic panels at a stationary angle, such as on your roof, the most efficient angle is 38.7°.
If you're planning to change the angle of your photovoltaic panels twice per year, the most efficient angle is 22.6° in summer months and 60.2° in winter months.
If you're planning to change the angle of your photovoltaic panels each season, the most efficient angle is 18.8° in summer months and 65.7° in winter months, and 43.6° in autumn and spring months.