What kind of motor do you need for an unobstructed vessel, for instance on lakes or the mouths of rivers, where the current isn’t so strong?

A 1 kW motor is enough to get you going 4 knots (7 km/h, more than enough for short trips and calm weather. A more powerful, 3 kW motor makes things safer in more inclement weather, but then you need a stronger, heavier battery. With a 6 kW motor you can even tow a tube, banana, or SUP for brief periods, though of course this uses more energy.

Can the Big Six, which is 6 meters long , be transported by car?  How much time and how many people does it take to ready the Big Six for the water?

For the basic model, without the hard cockpit and console, you’ll need to put your back seats down. Otherwise you’d need a trailer measuring 300 x 200 x 150 cm, which can also serve as a garage, so it can be stored all year –  no need  for a storage space or marina slip.  At the water, with 2 people it takes 1 hour with a 4 kW inverter (comes optionally for €350) or a 220 V network.

There are solar panels on the roof. How much energy do they provide? Is it enough to power both the fridge and the electric motor?

Three flexible panels from the Italian manufacturer Solbian provide about 500 W in the summer for most of the day. But they only weigh about 2 kg each! With that you can expect around 5 kWh daily if there’s sun, and around 2 kWh if it isn’t raining.no need to pay for a storage space or marina slip.