Westfalia Joker Maintenance And Operation page 12

1.6 Electrics
12V / 220 V Appliances
The 12V appliances (water pump, heating, display, fridge, and ice-
ex) are serviced by the second battery.
The lights in the living space are powered by the starter battery.
Important Notice !
12V Battery Use: Please note that the battery capacity is limited
by leaving it for a while without recharging. For example, at least
11V is required for using the additional heater.
220V electrical appliances (max 2000 Watts) can be used with the
internal plug sockets, as long as the socket on the outside of the
vehicle has been connected to the mains.
The external socket 220v – 16 Amps to CEE 17 (European
Standards) is located on the external left hand side of the vehicle.