USB solar charger Answered

Have to agree, without schematics I see no way of helping you.

Also please mention what you want to charge and please don't just say tablet or phone ;)

You might want to post the schematic or specs of the solar charger or what it was. Is there some charging controller circuit too, at least some diodes to prevent backflow? Smartphones also rely on detecting a signal or voltage on different pins of the charging plug so it may have not gone into charging mode.

Circuit diagram?