Dual batteries or jump box?

Discussion in 'Sport Boats' started by Jeff h, Dec 5, 2017.

  1. Jeff h

    Jeff h New Member

    18
    Sep 17, 2017
    2017 Sea Ray SPX 210
    4.5 merc, Alpha drive
    I know, I know, dual batteries are almost always better but this is in a new 2017 SPX. Can I just put in a Perko switch and a 2nd battery without having warranty issues with Sea Ray or would it be better to get a jump box for the next 5 years and then wire in a 2nd battery?

    I already won the switch NIB that I bought for a previous boat, but I'm not interested in having warranty issues.
     
  2. Gofirstclass

    Gofirstclass Well-Known Member GOLD Sponsor

    Apr 20, 2010
    Tri Cities, WA
    1995 550 Sedan Bridge,
    2010 Boston Whaler 130 Super Sport,
    1981 Boston Whaler 130 Sport,
    CAT 3406C's, 580hp.
    Why not ask the SR dealer you bought your boat from?
     
  3. Jeff h

    Jeff h New Member

    18
    Sep 17, 2017
    2017 Sea Ray SPX 210
    4.5 merc, Alpha drive
    'cause it is 8:30 at night and they are closed. :cool: :D

    Of course asking the dealer or Sea Ray directly will answer the warranty question but what about the jump box? Is this a common thing for new boat owners to use or does anyone that wants dual batteries just get them?
     
  4. Wylie_Tunes

    Wylie_Tunes Member

    391
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    Im a HUGE fan of dual bank setup, even more so then carrying a jump box. In a nut shell, you should be able to build a dual bank with a switch with no warranty issues. I do it all the time.

    2nd, go with a Blue Sea Systems switch, not a Perko. Perko makes a cheap switch, Blue Sea is much better.

    The issue with a single battery with a jump box back up is every time you run a battery down, its recovery state is a little less then before. Running one deep enough that it will not refire an engine, will kill it in a season or two if done on a regular basis. Further, a short trip back to the dock/ramp will not be enough to recharge the battery, further diminishing its static state of charge.

    A dual bank setup can allow you to designate one bank as a house bank, leaving the other bank as the main cranking bank to re-fire the engine.

    If you repeatably run house loads on the hook, go with a dual bank setup and consider a shore charger.
     
  5. BillK2632

    BillK2632 Active Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    I would put in a second battery with a switch, if it is done properly I cannot see how it would affect your warranty. Even my little 185 has two batteries - I would not have a boat setup any other way.
     
  6. tdgard

    tdgard Member SILVER Sponsor

    330
    Jun 4, 2013
    Atlanta, GA
    05-270 Sundeck
    496 w/Bravo III
    Another vote for 2 batteries. I also added shore power with an inverter/charger. Plug it in once it gets on the lift and I’ve never had a problem. The problem with jump boxes is that I don’t think anyone maintains them well-oh sure you may for a while-but when your single main battery goes dead in a few years, my bet is the jump box will be junk as well.
     
  7. Little Ducky

    Little Ducky Active Member

    365
    Jun 5, 2017
    Chattanooga TN/Dickson TN
    1998 SeaRay 290 Sundancer
    Twin 5.0L w/Alpha 1 drives
    What are your power needs going to be in the first place where a 2nd battery is needed?

    Are you adding electronics that are going to be used when on the hook?

    I would just wing it with having a jump box available (or tow boat coverage for jumps) to see if you even need to worry about your battery going flat.
     
  8. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    the new lithium-ion jump packs are about the size of a large cell phone so they are very compact.....they can also be left plugged into 110VAC full time without fear of overcharging and they will not develop a 'charge memory' like old lead-acid batteries would....

    I have been thinking getting one for the boat and leaving it charging on an outlet that is rarely used all the time....hopefully it would not be needed often but it would be a little piece of mind knowing it is there if needed....some models can also be used to charge cell phones and have a built in LED flashlight.....I would imagine they could also power 12VDC sound systems and a small power inverter to power things like 110VAC TV's.....

    hummmmm....could be a good gift idea from the Admiral...

    cliff
     
    Last edited: Dec 6, 2017
  9. OllieC

    OllieC Member SILVER Sponsor

    387
    Mar 11, 2013
    MinniSoCold
    2005 Weekender 215
    Mercruiser 5.0 mpi, Bravo III
    I've been looking at those too. However then I start thinking about 'hooverboard' fires with lithium ion.............
     
  10. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Installing a switch and second battery will NOT void your warranty. However, if the switch/wiring you install CAUSES an issue with another component (let's say "faulty" install, for example), then the warranty will not cover the failed component since it's not the component that actually failed.
     
  11. MonacoMike

    MonacoMike Active Member SILVER Sponsor

    Sep 15, 2009
    Indiana lakes and Lake Michigan
    97 270DA 5k Kohler A/C,
    85 Monaco 197
    7.4 300hp BII,
    260hp Alpha 1
    Another issue with the jump box, I carry one in my Monaco, is often when you really run down a boat battery the Jbox is not enough to get the engine started.

    MM
     
  12. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    you must have the wrong size or weak jump pack in this case....I have used jump packs on batteries that were completely dead in cold weather (thick engine oil) to start an engine....

    cliff
     

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