@Donalex - thx - I don't have any interest in promoting it beyond it's real capacities, so I'm glad that came out.
@Benny - Well, not where I am in San Francisco bay - and I don't exit the Gate. Besides, here we can just wait 4 hours and go either direction at 3knots with the tides
You can get more range using lithium batteries - they are in fact cheaper than lead-acid now if you factor in lifetime costs - but a bank large enough to give say..20NM range would be in the neighborhood of $4K (including BMS systems, chargers, etc). A lot of e-boaters park a Honda genny on deck for longer trips.
But for bays, lakes, other protected waters it can be pretty ideal.