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Bad battery charger?

Discussion in 'Catalina 310' started by Clydo, Jun 10, 2018. Add this thread to a FAQ

  1. Clydo

    Clydo

    Joined May 28, 2013
    214 posts, 8 likes
    Catalina C310
    US SF Bay/Delta
    My 2003 C310 still has original battery charger which some have said not the
    best. Yesterday did monthly water check in cells on 4D batteries. Shut of charger
    for about 20 minutes and check voltage and found:

    12.78 on starter battery
    12.81 on "house" battery

    My understanding 12.6 volts equals 100% capacity. Is my original charger not
    doing its job and overcharging or is this range considered normal? Batteries
    new April 2014. Four years old. Appreciate any thoughts.

    Clyde Thorington
    C310 # 245
    I LEAN TOO
    San Jose, CA
     


  2. Don S/V ILLusion

    Don S/V ILLusion

    Joined Sep 25, 2008
    4,991 posts, 241 likes
    Alden 50
    US Sarasota, Florida
    Given it's a 15 year old boat, shall we assume it's the original and if so, what charger is it?
     


  3. Benny17441

    Benny17441

    Joined May 24, 2004
    5,341 posts, 299 likes
    CC 30
    US South Florida
    20 minutes is not an adequate resting period. The batteries are likely to still have some residual voltage from the charging process. Try 2-3 hours as a minimum to get a more reliable reading. You mentioned you check the water level every month, how was it this time around? The usual tale tell for an overcharged battery is the rapid loss of battery water. There should be no perceptible loss of water in 4 weeks time but a problem battery or one being overcharged could require more water in a week or two. From your voltage readings it looks as if the charger is working and the batteries are in fair state. Some of these old chargers are not as delicate on the batteries and may not charge as fast as the newer ones but they get the job done. Wet cell batteries are quite forgiving so I would not worry much about the old charger. Save some $$$.
     


    Last edited: Jun 10, 2018
    JK_Boston_Catalina310 likes this.
  4. Clydo

    Clydo

    Joined May 28, 2013
    214 posts, 8 likes
    Catalina C310
    US SF Bay/Delta
     


  5. Clydo

    Clydo

    Joined May 28, 2013
    214 posts, 8 likes
    Catalina C310
    US SF Bay/Delta
    Not much water loss in about six weeks time. Wild eye guess would be about 1/8 to 1/4" in some cells.
    Plates always covered.. Don't know if that would be considered a lot.


    Clyde Thoringon
    C310 # 245
    I LEAN TOO
    San Jose, CA
     


  6. JK_Boston_Catalina310

    JK_Boston_Catalina310

    Joined Nov 18, 2010
    1,934 posts, 70 likes
    Catalina 310
    US Hingham, MA
    The original charger is the Charles Flyback charger. It is an "egg timer" charger and not an actual smart charger.

    See Benny's post on the battery voltage test you did.

    You have a fair amount to learn if you want to jump into the DIY battery/electrical world but we were all there one day. I would start by going to MaineSail's site called Marine How To and reading every electrical article except the one on LiFePo batteries (way to complicated for where you are right now). When you have done that, let us know and we can suggest some other places to go next.
     


  7. Don S/V ILLusion

    Don S/V ILLusion

    Joined Sep 25, 2008
    4,991 posts, 241 likes
    Alden 50
    US Sarasota, Florida
    That doesn't tell us what charger it is...

    If it is the period Charles charger, do yourself a favor and get rid of it asap. Those things killed more batteries than any other brand.
     


    JK_Boston_Catalina310 likes this.
  8. Clydo

    Clydo

    Joined May 28, 2013
    214 posts, 8 likes
    Catalina C310
    US SF Bay/Delta
    Thank you very much for reference "Marine How To". Real eye opener on reading "Standard" State of Charge
    Tables. That guy really knows his stuff. Thanks again.

    Clyde Thorington
    C310 # 245
    I LEAN TOO
    San Jose, CA
     


  9. JK_Boston_Catalina310

    JK_Boston_Catalina310

    Joined Nov 18, 2010
    1,934 posts, 70 likes
    Catalina 310
    US Hingham, MA
    Read through his forum here too. Some of the info is redundant but then people ask questions that might give some more insight. He also used own a C310 so he has lots of input into our boats.

    Fair winds,

    Jesse
     


    Alansails likes this.
  10. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    19,808 posts, 503 likes
    Catalina 34
    US Maple Bay, BC, Canada
    Clyde,
    Here's another helpful link, which includes many links to Maine Sail's material:

    Electrical Systems 101 http://c34.org/bbs/index.php/topic,5977.0.html
     


  11. Clydo

    Clydo

    Joined May 28, 2013
    214 posts, 8 likes
    Catalina C310
    US SF Bay/Delta

    Thanks Stu. Most helpful.

    Clyde Thorington

    C310 # 245
    I LEAN TOO
    San Jose, CA
     



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