1988 300 sundancer

Discussion in 'Classic Sea Rays' started by Drifter22ft, Jan 26, 2020.

  1. Drifter22ft

    Drifter22ft Member

    Mar 23, 2018
    220srv daycrusier
    351 188PRES
    With dual motors do you need to have a battery per motor or one battery for both​
  2. Skip Boyer

    Skip Boyer Member

    Sep 24, 2015
    North Carolina
    1998 500DA Sundancer, 1999 Maxum 2800, 1998 270DA, FFG 7 Oliver Hazard Perry
    Twin Detroit 6V92TA
    I would prefer at least one battery per engine. If one wont start hopefully the other one will. Add to that a crossover system and you can start /charge both batteries from one side or the other.
  3. Iprof

    Iprof Active Member TECHNICAL Contributor

    Aug 8, 2008
    Lake Huron
    A 300 DA 4kw Gen-set, central vac, electric head, windlass, AC/reverse heat, Lowrance 522ci GPS Char
    twin 5.7 with Alpha drives
    I had 2 golf cart batteries and 1 starting battery. The starting battery was dedicated to my generator. This worked great for anchoring out. I could get 18 hrs out of the house batteries before they needed to be charged. Start the genny and a few hours later we were good for another 18 hours. The longest we anchored out was 49 days went to the marina day 25 for a pump out then back to an other spot.
    If you don't have a generator make sure you have two deep cycle starting batteries, don't scrimp on the quality good batteries are a must for even a day at anchor with the radio and fridge going.
  4. SloBurn

    SloBurn Active Member

    May 30, 2013
    Greenwood Lake, NY
    1994 270 Sundancer. 7.4L Merc. Tow with a 2006 Dodge RAM Hemi
    340 HP Merc 454 c.i.
    3 batts would be best. One per motor and one house, all switched to each other. I have a single motor with 3 deep cycle batts, and switch between them all the time.
  5. QT1

    QT1 Active Member

    Oct 20, 2016
    Belair, MD
    Now, new to me, 1990 350 Sundancer, "Quality Time II". Avon rib w/ Yamaha 4 stroke.
    7.4 Mercruisers
    Just curious to the nature of your question...… My previous boat, 1988 300 Weekender the standard layout was 3 batteries.
    SCORPIO likes this.
  6. Drifter22ft

    Drifter22ft Member

    Mar 23, 2018
    220srv daycrusier
    351 188PRES
    That’s what it has but thinking about adding a 4 th but didn’t think I needed two for the engines
  7. Bill Nelson

    Bill Nelson Member

    Oct 21, 2019
    New River, AZ
    1981 Sea Ray Sundancer
    5.7 L Mercruiser
    I have 4 batteries for 1 engine

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