Inland Narrowboat
NB Felonious Mongoose Case Study.
Built in 2008 with a Beta 43 Hybrid system and a high-capacity 890 Ah battery bank, enabling multiple days of silent, emission-free cruising across UK inland waterways.
Vessel & Driveline Specifications
NB Felonious Mongoose is a semi-traditional narrowboat configured with the Hybrid Marine Standard Inland Waterways package. The large battery bank supplies ample domestic power while giving 2–3 days of pure electric drive autonomy.
Engine Unit Beta 43 Diesel Engine
Hybrid Package Single Electric Motor
Traction Battery 890 Ah @ 48V Flooded Lead Acid
AC / DC System Dual Victron Multiplus 48/3000/35
Battery Monitor Victron BMV 602 Gauge
Electric Autonomy 2–3 Days Pure EV Drive
Customer Feedback & Cruising Log
“Felonious Mongoose has been used to explore the English and Welsh navigable canals and waterways, making as little use as possible of the diesel engine.
Across 2009 and 2010, we covered 1,805 miles with total diesel engine use of just 231.8 hours. Assuming 3 mph when running on diesel, that equates to 695 miles on diesel and 1,106 electric miles. Diesel has only once been run for half an hour specifically for charging alongside the canal bank—at all other times diesel use was for combined propulsion and charging.
Further calculating from these logs, assuming 2.2 mph under electric power, gives 503 hours of pure electric propulsion.”
Tidal Navigation Note: The owner highlighted that when navigating tidal stretches of the River Thames, having the full combined mechanical horsepower of the diesel engine immediately available offered invaluable safety and peace of mind.