If you use a programmable external regulator like a Balmar, you can set both minimum and maximum bulk charging times from alternators. You may be able to do this with the Xantrex also...not sure how programmable it is, but see its Operator Manual. You can set bulk charging time parameters with Victron & MasterVolt chargers. I've never used Xantrex but have noted many -ve comments about them on this Forum.
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