I have an old setup where I have a ArgoFET connected to the generator on the in-side and the starter battery and the house battery on the out side. The house battery has even some generic PWM solar chager attached and a battery charge for shore-power charging connected.
I want to change the system so that the gererator primarily charges the starter battery, and the “overflow” can charge the house battery, while the solar charger and AC->DC charger should primarily charge the house battery and the overflow to the starter battery. I have ordered a Cyrix-CT to connect the 2 batteries, but I wonder if it will create problems with the ArgoFET and if removing the argofet will result in some new problems / downsides.
Prioritising the starter battery In a typical setup the alternator is directly connected to the starter battery. The accessory battery, and possibly also a bow thruster and other batteries are each connected to the starter battery with Cyrix battery combiners. When a Cyrix senses that the starter battery has reached the connect voltage it will engage, to allow for parallel charging of the other batteries.
Looks like this will completely replace the Argofet, and the alternator should be rewired directly to the starter battery. The Cyrix senses the voltage of both connected batteries. It will therefore also engage if for example the accessory battery is being charged by a battery charger
this will also take care of keeping the starter battery charged.
Only restriction is that the 2 batteries will need to have the same absorption and float voltages.