Installation does not get any easier, simply connect to your starter batteries and to your domestic battery, job done, makes for easy and low cost installation.
No direct connections to the standard engine alternator, or to the outboard (if used on an outboard), thus on new installations there is no extra wiring for a split charger system.
Ensures the engine battery if maintained and well looked after.
Multiple units can be used, for example if you have a 60 amp alternator and 3 battery banks (engine, domestic and bow thruster) then 2 of these can be used to run the now thruster and the domestic system. Their internal programs will adjust their charger patterns to accept the other unit and ensure only the excess power is used and the primary system is not placed in jeopardy.
Ensures there is no voltage rise on the engine management system, to ensure no alarms or damage to the system be it an outboard, or a car, or a boat.
No vehicle warranty issues as you are not connected to the main system.