There are 3 answers to the "higher power" topic: 1) higher power motors are easy, bigger batteries are expensive and heavy. 2) frequency and regularity of usage

There are 3 answers to the "higher power" topic: 1) higher power motors are easy, bigger batteries are expensive and heavy. 2) frequency and regularity of usage are the best determinants of whether electric makes economic sense, not size/power, but the bigger power boats tend to go infrequently and highly variable distances. 3) longer-term the low utilization rate high capex problem is solved by shared usage models (as it has been in every other field).