Your 75HP could be replaced with a 55kW motor and produce the same types of speed with similar (or same) boat and loads.
Let's assume 50kWh for your 1-hour round trip. That would be the size of the battery.
My battery is 50kWh and weighs just under 1,500#. The Winston cells cost just under USD 20,000 including shipping from
China. The motor voltage will determine the amount of cells you'll use. A less expensive path would be to buy a junkyard Tesla (or similar EV) battery and repurpose for your boat.
A Torqeedo Deep Blue 50R is USD 24,000 and uses 360v. It would take 112 cells (3.2v ea) with 140AH each to make the battery. Plus the BMS, connectors and battery charger. Torqeedo sells the BMW i3 battery - you'd need 2 - each weighs 256kg. That would be an easier installation since it is matched to the motor and has built in BMS. Most likely Torqeedo has a matching charger.
Best wishes,
Reuben Trane
Mobile: 786.303.1013
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