I am looking for outdoor lights that don't require an electrical outlet to use on my tiny balcony. Is there any such thing as a string light that is solar powered? The options that I have come across mostly use a spike in the ground approach which wouldn't work well for me. The lights don't have to be tiny like string lights, I just happen to like them. The balcony is enclosed in a brick arch which could be used to anchor the lights if needed. Thanks.