I have a 24 vdc charger for my TM batteries and only use engine charging for my main engine.
I work 2 weeks away from home. When I get home, starting battery is never drained down.
I also have the Minkota Talon. Manual says it will slightly drain battery over time. I never had an issue yet.
Onboard chargers are not cheap. If you get one, be sure it is ignition protected. You don't want sparks under the console on a gas boat.
Or go cheap and get a charger from any auto parts store like you use on your car. Once a month or so, charge the main engine battery.
|