We have a john deer generator attached to a battery bank. It has recently
Stopped producing charge so we have no power. Could you help?
Many thanks,
Jill Wootton

Jill,
Realize you have not given us much to go on...
For an answer any better than a guess you will need to provide some technical
Information...
Are you able to perform any voltage and current testing?
If time is an issue, calling a generator repair technician may be the right call.

Unclear if the battery bank is charged by the generator (admitted unusual) or the battery "bank" is to start the generator?