We only run a small battery bank to run a few lights at night as we are not on mains power. (The SEC want $70,000 just to connect.)

We use a 1963 and 1982 Lister diesel generators for the bigger electricity loads and running a 5kVa generator just to charge three deep cycle batteries isn't very efficient compared to an alternator or forklift battery charger.

I found this article which seems to have a lot of info:
https://www.homepower.com/sites/default/files/uploads/webextras/mark8.pdf

As long as the alternator can cool properly, the motor could be mounted vertically in a frame as on a lawn mower.