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Nice job, beautiful Shelving System. I was shocked how many people thought "no hardware" meant no tools! I never was taught to call tools, Hardware. Tools are tools and hardware is hardware and never the twain shall meet.
You could add a rechargeable battery in parallel with the solar array, The battery would make up the difference in current the array cannot supply. However this would mean that some times during the daylight hours you would have to shut off the unit so the solar array could recharge the battery