It is recommended.
Most items within your vehicle will be able to operate on either the 12V battery or gas. The exception is the air-conditioning, microwave and any power points in the vehicles. The length of time that the battery will last depends on a number of factors, including your usage of the lights, TV and fridge. Vehicles are equipped with solar panels to assist with charging the house battery while stationary. Driving the vehicle for long durations will also recharge the battery.
From a practical point of view, we recommend that you plug in to a powered site at least every second or third night. This will enable the auxiliary batteries to recharge.
To prolong your freedom camping experience, try to keep the fridge closed as much as possible. A good tip is to keep the fridge filled, even by using recycled bottles filled with water, and turning the fridge to a lower setting. Parking the vehicle in the shade can also reduce power consumption.
Please note you will have to book a campsite with power 240V (most of them are concrete but grass is fine) so you can recharge the vehicle overnight. Dump station and waste disposal will be available on the tablet in the camper to locate where they are.