No experience but thoughts yes.
If it is for local day cruising maybe it would be okay. My primary concern would be safety in a worst case scenario. In other words let's say you are out cruising and for whatever reason you need to use the engine to get out of trouble. How long will it work at full power? If you have to anchor for a couple of days in poor (no sun) weather then how do you ensure the motor batteries remain fully charged? How easy is it to repair at sea? And so on.
The equivalent "battery" for a diesel is a full tank of fuel and that may last several days at full power - no sun required.

One of my concerns would be how contemporary is the motor and battery technology onboard??...
Battery technology is getting better every year, who still owns a Ni-Cad battery drill for example, they were superseded by Ni-MH, then they were superseded by Li-ion

samsturdy said..
If there's a take off point on the shaft that will
drive an alternator of suitably large charge rate, wouldn't that dramatically increase longevity
of battery power under load.

good thought, but that would be like a perpetual motion machine! there are unavoidable losses converting the stored electrical energy to mechanical energy and back again, so you would essentially be wasting power...

Nice boat. Interesting to see it has a tiller not wheel. In the same way yachts usually have their drinking water and diesel tank capacity listed it would be handy if boats with electric motors had their battery capacity listed.

In one of the pics there are 5 big blue batteries visible that might be 12V 200AH each. That being the case I think the motoring might be limited to getting on and off the mooring. (Guesstimate based on 20hp motor running at half power is 10hp means its generating 7.5kW of force. Assuming its 50% efficient it needs 15kW per hour to run doing that. Battery capacity is 12kW so thats 1 hour of motoring).

If the boat has stacks of diesel though they could presumably run a genset on board to charge the batteries giving it a bit more range, like a diesel electric loco.

Found this while ordering battery pack,
40hp, re-generative
www.ev-power.com.au