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  1. #1
    Join Date
    Oct 2011
    Posts
    5

    Default Perko switch & alternator

    Installed two new marine batteries and a perko switch. #1 for starting and #2 for the radio. The kid at the stereo shop told me if I ran the perko switch on all (charging both batteries at same time) I would burn up my alternator. Is this the case Thanks 2004 XLV

  2. #2
    Join Date
    Oct 2010
    Location
    Lake Wylie NC Area
    Posts
    721

    Default

    No, it will not burn your alternator up. Dual battery switches have been installed on boats for years. Now we have ACR's and VSR's that combine the banks automatically with no ill effects.

    Under normal conditions, the primary starting batter rarely gets depleted, so combining it with a house battery that has been beat on for 6 hours at the party cove, is no different then starting the engine on "1", then switching over to "2". The alternator sees about the same load. Now, how deep we run down the house battery and how often we do this does ask the alternator to work harder then normal though. So, over time, this can accelerate the wear on the alternator, but not burn it up.

    There are exceptions to the rule, like having 12 6 volt batteries all run down and then expecting the alternator to do it things. it wont, sorry. With an average system of 1-3 amps and a typical 2 battery system, I would not worry about running in the combined mode, but I would also caution to not expect the alternator to recharge a dead house battery. Alternators do fine to keep up with normal loads and replenish whats normally used, but 2-3 amps is not "normal". Coupled with a 15 minute drive back to the slip or launch ramp, the alt will not have enough time to put back into a house battery, whats been drawn out over the course of a day. This is where an external mode of charging comes into play.

  3. #3
    Join Date
    Oct 2011
    Posts
    5

    Default

    Thanks now I can have some fun

  4. #4
    Join Date
    Sep 2009
    Location
    Copperas Cove, TX
    Posts
    1,761

    Default

    I've never had less than 3 batteries in any of my boats (1 starting, 2 stereo) and now I currently have 4 batteries (1 starting, 3 stereo) and always run my Perko on "1 + 2" (aka: "all" setting) and no ill effects. Earmark Marine did my boats installs so I go by their instructions (per David owner). When floating more than 15-20 min I'll switch my Perko to "2" which is the stereo bank. Currently using 2 onboard chargers so when I get back to my storage unit I just plug in and I'll have topped off batteries in about 5-6 hours of charge time.

  5. #5
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    738

    Default

    Can you take a pic or share a link to an onboard charger?
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

  6. #6
    Join Date
    Jul 2008
    Location
    Snellville, GA & Lake Sinclair
    Posts
    6,890

    Default

    I think this is the one the factory installed in my Mojo as part of the dual battery package.

    http://www.pmariner.com/productFeatu...oductNum=41221

    And this gives some price ranges

    http://www.google.com/products/catal...ed=0CDAQ8wIwAw
    Drew
    New ride: 2012 Mojo
    Old ride: 2008 OBV

  7. #7
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    738

    Default

    Wolf where is it located in the boat?

    Thanks for the links
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

  8. #8
    Join Date
    Jul 2008
    Location
    Snellville, GA & Lake Sinclair
    Posts
    6,890

    Default

    Mine is in the cubby behind the observer's seat, mounted to the amp board.
    Drew
    New ride: 2012 Mojo
    Old ride: 2008 OBV

  9. #9
    Join Date
    Jul 2009
    Location
    Fort Worth, TX
    Posts
    1,023

    Default

    I love having the charger. I can play music while I'm cleaning the boat and then just plug the charger in and not have to worry about the batteries being drained.
    -2012 Supra 21v
    Wetsounds Rev10's, Wetsounds SYN 4, Wetsounds XS-12, Alpine MRP-M500,
    JL Audio JX360/4, Polk MM651 Interiors
    -2008 Mobius LSV

  10. #10
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    738

    Default

    I would love to see pics of your cubbys and how it's all set up. Now I'm thinking I need one of these. Damn you!
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

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