We have standard cigarette lighter sockets installed under the seat of both Transalp and Africa Twin and at the handlebars. We plug in USB converters where needed; there are some (we use VoltCraft) which click in and stay where they are supposed to be staying. We use the lighter socket for charging the batteries in winter, to power the compressor etc.; the USB is used for recharging the Cardo Scalas, the USB Nikon charger unit, cellphones and other USB appliances overnight, when touring. In fact, we have not one 220V appliance with us.
None of our sockets is connected to the ignition but are directly wired to the battery, otherwise the overnight charging or re-charging of batteries would not work without the bike´s ignition "on". Nothing wrong with this wiring, but a fuse very close to the battery is required. A word of warning in respect to hardwired USB power outlets, which are available on the market as well: they use electricity even when not in use (i.e. when no appliance is plugged in), so they will - over time - discharge the battery, so a switch close to the socket itself is recommended.
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