Hi and Welcome,
Do you have a battery isolator in your plans ?
a battery isolator will take input from the alternator, then connect to the chassis battery.
And a 2nd output to the "house battery" is switched so that it is only connected when the alternator is making power ( engine running) using a trigger wire connected to chassis electrics.
Some methods use a solenoid switch - simple and works BUT the voltage can flow both ways
My 2006 van has a Surepower 16023A ( 160 amp, A for alternator) this has the switched 2nd output to house battery.
This uses didoes so that the power can only run FROM alternator to batteries, not backwards- so the batteries are isolated from each other.
a drawback is that diodes waste power- the typical 14.7 volts from the alternator will drop to about 13.4 volts to the batteries
Another device worth looking into is the Victron Argofet 200-2AC which uses FET transistors to switch the power. No voltage drop.
It is generally not considered a requirement to have solar connect to the chassis battery. It can connect to the house battery via your controller. different types of batteries, lead/acid, agm, lithium each have their own requirements for charge regime
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Mike
2006 Pleasure Way Lexor TD on a Chev 3500
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