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 youd think i’d get the most solar power input when the sun is most intense in the summer, and shines longer. but i get the most input on sunny days in the fall and winter, when the low temperatures increase panel efficiency. 
 Hmm I get a lot less in winter also lithium batteries less efficient.  Though mine are on an anchored boat that I only heat when I'm there so a different situation

Do you move them to catch direct rays?  I've found I can double my wattage by pointing them at the sun throughout the day but I seldom bother because I don't need more 
 Total production from mine is still higher in summer but it's specifically due to total, usable daylight.