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  1. #1
    Join Date
    Jun 2017
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    Ontario as well
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    58

    Default Lithium battery for 150HP Pro V

    I recently bought an outboard powered ski boat (1992 Mastercraft Barefoot 200). It has two large deep cycle batteries in the back. (Normally they have 1 battery) The extra weight is adding to the size of the wake and my local marina says that deep cycle batteries will wear out the stator on my outboard. So I am thinking of going to a new single battery come Spring. The size and weight of Lithium batteries has me curious that I might be able to fit one under the passenger seat, which would help move the weight forward in the boat. How big and powerful a battery does a Pro V need? Anyone have experience with Lithium In batteries in a marine application? Suggestions appreciated.

  2. #2

    Default Re: Lithium battery for 150HP Pro V

    Quote Originally Posted by Nucad View Post
    The extra weight is adding to the size of the wake and my local marina says that deep cycle batteries will wear out the stator on my outboard.
    There's a lot more to it than your marina making this ^^^^ statement. Your engines regulator/rectifier prevents the deep cycle battery from gaining a charge >14+volts. Meaning, as you're running the engine the stator supplies charge back to the battery but never more to burn out stator. Your marina is referring to engines without the capability of regulating charge.

    A deep cycle battery can be used for cranking the engine, so long as this battery is isolated from all other loads. You don't want to regularly discharge a deep cycle more than 20%-50% of total volt capacity, as it's cycle lifetime will decrease. Also, deep cycle batteries will have less cranking amps compared to typical starting battery of the same size. Deep cycle batteries are intended to be recharged over a extended period of time (6-12 hours), verses being topped off with charge by quick charging.

    If you're running any other electronics on your boat, such as navigation lights, stereo, etc., these loads should be isolated to their own house battery. This application is best for deep cycle batteries. So you could do away with 1 of the 2 deep cycle batteries, buy a typical marine cranking battery, run engine load off cranking battery, and all other electronics off deep cycle.

    I understand the premise of shifting weight forward to lessen the wake, but the weight of 1 battery will have very little effect on a 20ft boat, if any. Typical marine battery weighs 40-50lbs. Shifting both batteries forward would have the effect you seek. But I would not recommend going to only 1 battery IF you are running accessory electronics. Not a good idea, though many do it. Ironically, these are the same boaters who find themselves stranded because of a dead cranking battery.

  3. #3
    Join Date
    Jun 2017
    Location
    Ontario as well
    Posts
    58

    Default Re: Lithium battery for 150HP Pro V

    Thanks for the detailed reply. I guess you would have to charge the deep cycle battery used for electronics with an AC battery charger? I have a Lowrance HDS 7 GPS. Wonder if the Yamaha puts out enough amps for that?
    Last edited by Nucad; 09-20-2017 at 09:44 PM.

  4. #4

    Default Re: Lithium battery for 150HP Pro V

    Quote Originally Posted by Nucad View Post
    Thanks for the detailed reply. I guess you would have to charge the deep cycle battery used for electronics with an AC battery charger? I have a Lowrance HDS 7 GPS. Wonder if the Yamaha puts out enough amps for that?
    Yes, accessory batteries need to be recharged by a 12v AC battery charger. I'm not sure what the amperage draw is for your GPS, but if it's paired with the cranking battery you should be fine. However, if you're running the GPS while the engine is off then you're drawing amps from the battery that are not being replaced. Depending for how long the engine is off, there is chance you won't have enough cranking amps to start engine. That's why I previously suggested to isolate the engine to 1 battery, accessory battery for all other electronics. If the engine does start, you'll need to run the engine for "X" amount of time in order to recharge "X" amount of amps.

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