"chuck" wrote in message
...
I think that might be difficult to say. Among other things, it will depend
on the actual capacity of your battery (likely to be less than when it was
new) and the starting requirements of your inboard. Other factors that
might influence the minimum starting voltage are engine and battery
temperatures. Worst case is cold battery and cold engine.


I agree. This is just to hard to predict.

The best way to ensure you have enough battery capacity to start your
engine, is to have a separate starting battery and an isolation switch.

Much simpler and more predictable.

A good practice would be to purchase a new battery each season and install
it as your starting battery, move the '1 y/o' from the previous season over
to aux/house battery service and take the '2 y/o' battery home for use in
your second car. Small investment but great insurance.

My opinion, FWIW.

Steve
s/v Good Intentions