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.
Ask your solar panel vendor about the certifications they have and about the testing of the panels you are interested in. You might qualified for some rebates offered by the government if you go through a certified vendor and choose panels that have received certifications too. Besides, this is a good way to make sure you are getting a quality product.
Solar set-up for charging AA/18650 cells off grid.
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.