Originally Posted by Tom.B
Alternator and charger should connect to a buss bar and only go to the house bank. Then use a Blue Seas ACR to charge the starters batts. There are other ways, but this is the simplest with fewer points of failure.
I agree with you but I see two other equally simple and maybe cheaper ways.
1. Use a Xantrex Echo Charger if your house and start batteries are of the same type. Very cheap and easy install.
2. Use a Duo-charger where you can set a different charge profile for your start battery as well as provide thermal sensing if you want. This is nice when often the start battery is in the ER and the house bank is not.
Again, I agree to send all charging sources to the house bank and then charge the start battery from there.
My boat uses Duo-chargers to charge the engine start battery, the genset start battery, and the thruster bank. All the charging from alternator, battery charger, and genset go directly to the house bank.
I also have an ACR connecting the house to the start battery, but I disconnected it, relying solely on the Duo-charger which the PO had bypassed in favor of the ACR.