Solar module requires a lot of light ...

The fairy lights is really nice and long enough to wrap my 6 m long balcony railing. My balcony has winter but unfortunately only about 2 hours of direct sunlight - has been identified as that is not enough for the light string. They came with full batteries, but after 2 to 3 days, when they were empty, the lights chain invited to barely and not at all or only for a very short time burning.
Conclusion: in sunny locations great for shade not recommended.