Can I add a second battery to my boat?
Keeping this in view, do I need 2 batteries in my boat?
Your boat should be set up with two batterys and a battery switch. The primary reason to use two batterys is to have to ability to hold one in reserve in case of difficulties on the water. It also alows the operator to decide which battery should be charged by the engine when running.
- If using more than one battery in a bank, don't mix battery types, or old and new ones.
- Keep your batteries clean and store them in a cool, dry place during the off-season.
- Check for corrosion.
Considering this, can you run two batteries one alternator?
A car alternator will be more than capable of charging two batteries. The first is if both batteries are low on charge then that would be too much for the alternator, but if only one is low then it would be fine. The second thing is linking the batteries will cause more problems.
Turning off the boats motor will not prevent the battery from draining. Instead, you could look at using a charger that will help keep the battery fully charged. If you plan on storing your boat for a few weeks, disconnect the battery and make sure it has a full charge.