Called out to a 2010 narrowboat in Penkridge with battery problems on an Isuzu 42 engine. For the 12 months of ownership there’s always been a problem with fridge cutting out in morning. New set of batteries recently fitted at boatyard but problems still persist. Poor output from alternator. I fit this 120amp alternator:
With a 60mm pulley and Gates Quadpower belt.
Also fit a Victron BMV700 battery monitor and rewire/balance the battery bank. The new alternator keeps up with the Zanussi washing machine. At the same time resolved problem with solar install. Customer delighted.