Yes, taking most solar phone chargers on an airplane should be no issue and can be packed in checked or carry-on luggage. However, if it contains a battery pack (typically a lithium-ion battery) built into the charger, it needs to go into your carry-on bag to comply with federal aviation authority guidelines. If your solar phone charger contains an internal lithium-ion battery that exceeds 100 watts, it isn’t allowed onto the plane.