Ok not great on cloudy days

These are ok not great on cloudy days like they say they are. I'm looking forward to the spring and summer months when the sunshine charges then up. I have only ever had one set that fulfills the promise of lights on winter days and this set isn't it. Great while they lasted on the sunny days not now though. Maybe others will have more luck. My garden it at the top of a hill with no over hanging trees and sun shine from 11am (on cloudy days) and sunrise on great ones, until sunset still it's not enough