Looking specifically at the Greenline 48.
The specifications are 49' LOA with a 15' beam, displacing 30,400lbs (dry) powered by twin diesel motors available in size between 110 and 380 HP. Maximum diesel speed is 23kts (380HP) with a range of 900Nm (396 gallons of fuel).at 7 knots cruising speed. Electric propulsion power is from twin 14kW motors capable of 4kt cruising speed at a range of 20Nm. It also comes with a 500W solar panel with 46kWh capacity at 60V.