Silent Yachts 55 review | Is this solar/electric hybrid yacht the future?

https://youtu.be/4pFsvH78IPw

I found this really interesting. Silent cruising 11 hours at 8 knots. At 2:30 he's standing on the very back of the boat at good speed and it's remarkably quiet. It's top speed is an impressive 17 knots. (3:30 on this video. )

What questions does it raise? 

Lifetime of the battery pack? Solar panels? 

How is heat from battery pack vented - risk of fire?

It has a 27 foot beam - are there many berths that size? Does the 500 L wastewater tank hold enough for transoceanic journeys at its cruising speed? What happens if the boat takes on water and the motor or batteries get wet?