ALLPOWERS Portable Power has 4 ways to charge the emergency battery. It takes 1.5 hours to fully charge the portable power station using an AC 230V wall socket; about 3-4 hours using a solar panel in direct sunlight (100W max); about 3-4 hours using a 12V/24V car cigarette lighter socket; about 1 hour using AC charging and solar panels together (300W max).