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It really just depends how complicated you want to make this thing. Best efficiency would be to never run the alternator unless you have to. So, you could have an alternator disable switch that kills it in hybrid and EV mode, and in ICE mode. However, you'd probably still want some circuit to watch your pack voltage and kick out the dc-dc at some point if you have a very long ICE trip to make so it does kick on the alternator eventually.
The simpler thing to do would be to disable the alternator in hybrid mode (and EV mode obviously) and just turn it on in ICE mode. With a little tinkering (probably just a relay or something) this could be built right into your mode selector switch.
I take it you still haven't heard back on from that forklift guy on the motors?
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