Originally Posted by
Bassnailer
You need to have dedicated batteries for your trolling motor, whether its 2 for a 24 volt system of 3 for a 36 volt system. The problem with putting your starting and house battery (whether they are the same battery or 2 separate batteries) in the circuit with your trolling batteries wired in series, is the load distribution. The shared battery will always be taxed more than the others in the circuit, which will cause the other two to drain as they try to level the voltage. Batteries wired in series need to all be the same make, model and age, and are to be treated as one battery with multiple cells. Also, you should not mix a cranking battery with a deep cell battery in a series circuit either. Sure, it would work, but you would wear out all your batteries very quickly.