A short answer to this somewhat complex topic: Your K-plant delivers max. 1.9 A at 5V, i.e. not even 10 watts. For most applications, this is barely enough or not enough. Sherpa draws what it gets (within certain limits) and the bottleneck is also there with the K-Werk.
Have you ever thought about only using the K-Werk to charge your lights, for example, and drawing power from the sun for everything else? There is a mobile panel for the Sherpa with (theoretically) 50 watts of power, which in practice produces 5 to 25 watts (depending on the weather). You can also connect them in series... If you - like me - are in the far north in summer, your Sherpa charges for 24 hours and you draw up to 100 W (connect laptop, etc. via USB) and also power 220V devices (use GaN transformer if necessary).
Have a great trip!