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The optimal latitude tilt for maximizing summer production in photovoltaic systems is typically around 15 degrees for locations that are further from the equator. During summer, the sun's position is higher in the sky, which means that panels tilted at a lower angle will capture more direct sunlight.

When photovoltaic systems are set at a tilt that is closer to the latitude of the location, they tend to maximize energy production throughout the year, but to optimize specifically for summer sunlight, lowering the tilt is advantageous. This is because a lower tilt angle allows the panels to receive sunlight more directly during the high sun elevation of summer months, enhancing their efficiency and overall energy output.

This is in contrast to other tilt angles such as 30 degrees or 45 degrees, which may be more beneficial for winter production or year-round energy optimization but do not optimize energy capture as effectively during the summer peaks. A tilt of 0 degrees would mean that the panels are flat, which in many locations would not optimally capture sunlight during peak summer positions.