How To Mount A Generator I've Got A 96v Battery Pack & Want To Build A Gas Engine Charger Using An Alternator. How Do I Mod An Alt?

I've got a 96v battery pack & want to build a gas engine charger using an alternator. How do I mod an alt? - how to mount a generator

I have almost finished one, and an EV Suzuki Sidekick. I get a gas generator in the distribution sector to support and enable the load, if you can not network compatible. How do I change an alternator 12V to 96V output?