ah, I see your problem now. when you read 1,728 watts stored you didn't
realize that if you took that energy back out you could get 2.3 hp back out for
one hour, or 0.23 hp for 10 hours, or 0.0023 hp for a thousand hours or 23 hp
for six minutes or 230 hp for 36 seconds, or 2300 hp for 3.6 seconds or 23000
hp for about 1/3 second.

All less inefficiencies, of course.

bax, you need to read more slowly, paying particular attention to content.

I'll post your words again so you can read them slowly:

"6 amps at 12 volts for 24 hours = 1,728 watts, which = 2.3 hp-hours"

This statement is quite unequivical, it first states that the product of
current and volts and time is watts, wrong; it then states that watts are
equivelent to hp-hours (assuming a conversion factor), also wrong.

Cheers
Marty