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sorry I can’t seem to reply to the original thread, instead when I try to reply all I am allowed to do is to post to a new topic.
If your current house battery bank is 12vdc, to solve the issue, leave one La battery in a house bank that connects ONLY to the alternator output and nothing else. This will fool the alternator and regulator into thinking it is still charging a La battery. Attach the input lead for a BtoB charger to this La battery and connect the output from the BtoB charger to your Li house battery bank. The BtoB charger will see the voltage rise on the input side when the engine starts and will pass current to the output side to charge the Li bank. When the engine stops, the voltage drops on the input side and the BtoB charger will turn off properly isolating the La and Li batteries. If you want more charge current than only one BtoB charger can supply, add more BtoB chargers in parallel. Do not exceed a total of 60% of the rated capacity of the alternator to prevent over heating these big oil cooled alternators. They can handle a lot of heat but no reason to take a risk since you can connect three 60 amp BtoB chargers for a total of 180 amps of charge current that will charge even a large Li house battery bank while driving in a reasonable time.
Jerry