Larger solar panels are not necessarily a good option. The quality of each panel is affected by many factors, like wattage and warranty. Consider everything when making a hefty purchase like this.
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When the space and resources are available, your best bet for maximum solar energy gathering is a panel system with sun tracking. This type of system tracks the sun's movement across the entire day, and even the entire year. This may cost you a little more at first, but the results in the end are worth it.