is this the only bank you have? your
engine and your gen start off this bank?
if so you certainly don't have any redundancy...
if so then add a starting battery. like a group 31 depending on your
engine. I would move the engine and gen onto this bank. and leave the current bank for the house.
you'll need more switches,
wiring, and a way to charge both banks from the alt. and a way to start the engine / gen from the house if the engine one were to fail