Originally Posted by
Craig B
Hi,
I am sure you can get an onboard device that monitors your batteries and allways ensures you have enough voltage in the main engine starting battery.
I think Piranha make something like this for the 4WD market.
Works by cutting off the auxillary connection from the main battery when the Aux voltage drops below 12.9V.
Maybe look at something like that, rather than add the weight of another battery.
Also maybe look into a charging setup when the boat is stored, I am looking into a charger that is mounted in the shed and continually charges the battery so its allways in top condition and less likley to let you down at sea.
A mate of mine only has one battery and carries one of those portable battery jump starters from super cheap as a back up.