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Starting When Start Battery is Dead?

Discussion in 'Ask A Hunter Owner' started by DayDreamer41, Apr 27, 2017. Add this thread to a FAQ

  1. weinie


    Joined Sep 6, 2010
    1,082 posts, 135 likes
    Jeanneau 349
    US port washington, ny
    My 2015 Jeanneau had completely independent circuits for the house and engine loads as it came from the factory. (Charging 'combiner' not withstanding).

  2. Maine Sail

    Maine Sail Moderator

    Joined Feb 6, 1998
    10,314 posts, 298 likes
    Canadian Sailcraft 36T
    US Casco Bay, ME
    Yes some later Bene & Jenneau's use the Cristec isolators and have independent switches, why I said many, but like Hunter many don't have a way to parallel or cross connect for emergency situations. Hanse does a similar thing, two independent banks, two ON/OFF's, no way to cross connect in an emergency.

    A sound switching design on a cruising boat would...

    *Allow Bank 1 / HOUSE to be used for both starting and house loads in an emergency

    *Allow Bank 2 /START to be used for both starting and house loads in an emergency

    *Allow full isolation of the bank not being used in an emergency


  3. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,396 posts, 340 likes
    Catalina 34
    US C34 San Francisco

    Please, do NOT even think about this. It is a rotten idea for a sailboat.

    Here's why:
    AGM Battery Issues and the Blue Seas Dual Circuit Switch (from Maine Sail) "DARN AGM Batteries"

    While you're at it, lots of y links come from here, which include a lot of Maine Sail's posts:

    Electrical Systems 101,5977.0.html


  4. Terry Cox

    Terry Cox

    Joined Dec 25, 2000
    2,749 posts, 155 likes
    Hunter Passage 42
    US Shelter Bay, WA
    Our boat consists of two banks; starter and house. A few years ago the starter battery died while at anchor in Parks Bay across from Friday Harbor. My simple solution was to carry a pair of jumper cables. Odds of both banks being dead pretty remote. Connected the house to the starter battery, waited a few minutes for the juices to flow and the engine started right up.

  5. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,396 posts, 340 likes
    Catalina 34
    US C34 San Francisco
    And our simple solution is to turn a switch. :deadhorse:

    Your boat, your choice. ;):biggrin::)

  6. Big Red

    Big Red

    Joined May 18, 2017
    15 posts, 3 likes
    Hunter 44
    US 45208 Changes
    Our Hunter 44 also has the house and start battery switches (on/off only) installed directly under the nav station. When leaving for home, we turn the start battery off but have always left the house batteries on but no draw (all breakers off) to keep them charged via shore power. In 3 short years, one house battery began boiling, fortunately, we were on board and immediately replaced it. 7 days later a second house battery boiled over and had to be replaced. The third house battery in the rotation seemed fine after several days so we left it but decided to turn off the house battery switch. Can anyone help me understand why the house batteries are boiling over and not simply dying? Is this indicative of a faulty regulator; inverter; age related??? The batteries are led acid and water level well maintained. Also, from the discussion, it sounds like the house switch might not even be connected. If it is active, what are the implications of turning it off? Very confused at this point. Thanks.

  7. LeslieTroyer


    Joined May 20, 2016
    885 posts, 181 likes
    Catalina 36 MK1
    US Sammamish, WA Everett, WA
    I would look to your charger. Batteries boil when overcharged

  8. DayDreamer41


    Joined Oct 29, 2016
    400 posts, 114 likes
    Hunter 41 DS
    Un Michigan Port Huron
    Sounds as if you charger has entered the equalization mode where the charge voltage is (going from memory) 14.7 volts, which is intended to remove the sulfate crystals from the battery plates, this is a manual operation, batteries electrolyte levels need to check and topped off prior to this type of charge. Is it possible that your invertor charger has been put into equalization mode by mistake?

  9. ice breaker

    ice breaker

    Joined Sep 11, 2011
    183 posts, 11 likes
    Hunter 41
    US lake superior
    I had to replace the 50amp charger in my 2004 last year. It had losts its smarts and was constantly resetting its charging cycle. I would have thought it was the house batteries being bad......but I had replaced them only a week before. New charger solved the problem and saved the new batteries.

  10. seadaddler


    Joined Dec 19, 2006
    5,016 posts, 77 likes
    Hunter 36
    US Punta Gorda
    My 2007 H-36 came with only 2 4D's with a switch for using one bank at a time and when the 4D's went south I switched to 4-6volt GC batteries and one start battery and put in a off and on switch to combine the house with start and than last week put in a ACR and it will charge the start battery any time any charging from my solar or yanmar or Gen or charger and also have the the combine switch just in case.

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