What is the initial condition of the battery though? For cars, under 11v
with about 10 sec of cranking and the battery is considered suspect or a
candidate for replacement/charge. By 'large' I would assume 80-100 Ah
min. Smaller, less frequently charged or used batteries, with age, may
perform as yours perhaps. Generators don't get used that often, so
performance suffers. I would suspect that the lightness of the load is
what allows a battery under load at 9v to crank the gen. More cylinders
and 9v wouldn't cut it. ;)

-Skip

Carl Denk wrote:
> I have a 27 HP. 2 cylinder Kohler engine on a generator with a heavy 12 
> volt marine battery. On starting this relatively small engine, the 
> voltage drops to 9 volts at the battery!
>

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