Originally Posted by Macblaze
I have to admit the whole amps to watts to volts thing is the one part of sailing likely to explode my brain. I'll bring along the car adapters; I just figured the inverter could charge more than one device at a time.
I take it from the comments that the inverter will draw more amps regardless of the load on it?
The inverter does draw a bit more. For the iphones you can use the small cigaret plug, but for your laptop that will not charge via usb as it needs 19 volts. So you either need a step up transformer to go from 12 to 19 v.
But for a charter
the inverter will be more flexible as you can recharge or use other stuff too, like a shaver etc.
Plus at the end of the charter you can still use it at home for in car charging etc.
Btw some small cigarette to usb chargers wont work well with iPads because Apple set a different voltage or something.