Most solar charger power banks on the market today are designed to work well. However, there are a few things to keep in mind when using one. First, it is important to make sure that the power bank is fully charged before using it. Otherwise, it will not work as effectively. Secondly, it is best to use the solar charger in direct sunlight. This will help to ensure that the power bank charges quickly and efficiently. Finally, be sure to read the instructions that come with your particular solar charger power bank to ensure proper usage.