If batt switch is on 1 does the boat charge both 1 and 2?

Discussion in 'Sport Boats' started by Fasterblaster, Jun 26, 2007.

  1. Fasterblaster

    Fasterblaster New Member

    43
    Jun 14, 2007
    Vancouver, B.C. CANADA
    I've run down one battery. I'm a little surprised by this. did I only charge one battery last time out?
     
  2. boatmailster

    boatmailster New Member

    May 13, 2007
    NY
    none to share
    none to share
    Re: If batt switch is on 1 does the boat charge both 1 and 2

    on single engine boat - most likely you charging one battery at time.
    set switch on both and go for a ride
     
  3. jacktm

    jacktm New Member

    175
    Oct 16, 2006
    ny
    boatless
    boatless
    Yes mine is one at a time. I go out with #one battery for a day, next trip I use # two. Seems to work well
     
  4. CSR_Admin

    CSR_Admin Administrator Staff Member

    Mar 10, 2004
    Get yourself one of these neat new battery switches from Blue Sea: http://bluesea.com/products/7650

    They are about $100. You put the Switch to "On" instead of the 1/2/Both nonsense. When the systems is charging it will automatically charge both batteries, when it is not charging the engine battery stays charged so you can always start the engine and the house battery powers all the onboard accessories. Its one of those things most small boats should not be without.
     
  5. Searay Jim

    Searay Jim New Member

    271
    Oct 3, 2006
    DFW
    240 Sundeck
    540cid w/BIII
    That's pretty cool. A switch that includes an isolator but it's even smarter.

    If you have the 1/2/both switch like most of us do, just be sure to run it on each battery to keep each one charged. It should NOT be wired so that it charges both. And you should not run it in Both to charge both batteries. I know some people do, but it's not good on the alternator and the batteries need to be separated. I think if you have 2 of the same kind of battery it may be different, but I haven't found anyone that can convince me yet. :grin:
     
  6. Gunn

    Gunn Active Member TECHNICAL Contributor

    Oct 4, 2006
    Potomac River - MD
    2003 280DA and 1995 Sea Ray 175
    Twin 4.3l and 3.0l, all w/ AlphaI GenII drives
    This too is exactly what I do. I don't really ever use Both, as I'm afraid I'll forget it was there and end up draining both batteries...
     
  7. ehaze

    ehaze New Member

    245
    Mar 16, 2007
    Austin
    270 SLX 2007
    496 Mag w/Bravo III
    when I’m parked and listening to the radio I put mine on 2 (two batteries). Before I start the boat I switch it to 'all'.


    [​IMG]
     
  8. estebanj

    estebanj New Member

    590
    Apr 2, 2007
    South Florida
    260 Sundancer
    350 Merc
    ehaze... just to check your wording, position 2 does not mean two batteries, but rather Bank #2 (or battery #2).

    All = both banks/batteries
    1 = bank/battery 1
    2 = bank/battery 2
    Off = None

    Esteban
     
  9. ehaze

    ehaze New Member

    245
    Mar 16, 2007
    Austin
    270 SLX 2007
    496 Mag w/Bravo III
    in my case 2 = my 2 extra batteries

    :grin:

    [​IMG]


    I've yet to run these two all the way down.
     
  10. charlg

    charlg New Member

    745
    Jan 7, 2007
    Newton, MA
    2000 280 Sun Sport
    / Raymarine C80 w/ Radar / Sirius weather
    / SH GX5000S VHF
    Twin 350 Mags / B1's
    / Corsa exhaust
    Last fall my #1 battery fried. So, my mechanic sold me a starting battery for my #1. I've been leaving the switch on 'both' all of the time. Occasionally, if I'm going to be sitting for a while with some accessories on, I will switch it to #2.

    Is this the correct way to use the two batteries? This post has me questioning if I'm using it right. :huh:

    Are both batteries being charged?
     
  11. Larry&Leisa

    Larry&Leisa Active Member

    Oct 26, 2006
    Keystone Lake Oklahoma
    1999 330EC
    454's
    :smt017
    yeah..me too charlie... I was told use 1 or 2, then you have the other in reserve. If needed, you could put it in 'both' for instance starting if we'd been using '1' all day for the radio, pumps ,etc while beached and had run it down and #2 was a lil low on charge also from being a bad battery. :huh: I thought both batteries were being charged all the time no matter what setting it was on however. ( and both my batteries are the same type , etc tho too)
     
  12. Sundancer

    Sundancer Active Member

    Jul 20, 2005
    Prosser, WA
    30 year old CLASSIC 300 DA, towed almost anywhere behind the Duramax Duallie Crew Cab.
    16 cyl, 700 cu. in./Alpha I's
    Think of your switch as an isolator. All it does it determine WHICH battery to use based on the setting. So switching to "1" means that's the ONLY battery the engine/alternator sees when it's running. The same with the "2" setting. The "All" setting means that it sees both and is meant only for an emergency start when you don't have enough juice to start from a single battery. If you leave it in the all position, one battery will drain into the other battery until they are equalized. So if you have a full charge on #1 and a dead #2, #1 will discharge into #2 attemping to equalize the difference. The reverse is that if you are trying charge both batteries at the same time, one battery will get too much juice. The best thing to do is to utilize one battery at a time. If one battery is toast, you'll end up cooking the good one too!

    Others will also tell you not to switch positions while the engine is running, but the Perko is a "make before break" switch so it should be OK. I do it all the time while my engine is running. By switching to a single battery, you'll charge it faster too so if something happens and you have to shut down, a single battery will come up to starting capacity sooner.

    NOW, the other side of all this is you can install a separate set of isolators that WILL charge both batteries independent of the switch position! It takes one battery and assigns it as the engine battery and charges it first. Once it's restored then it will begin charging the other batteries. This is available at West Marine and does make the process brainless! I'm too cheap to spend the money and can tell the condition of my batteries based on the blower speed!! I just switch batteries daily when we're out to make sure they are charged and in good working condition.
     
  13. Searay Jim

    Searay Jim New Member

    271
    Oct 3, 2006
    DFW
    240 Sundeck
    540cid w/BIII
    Sundancer said it better than any of us have so far. :D

    If I have a weak battery, once I get the motor started, I switch to the weak battery and charge it up. As SD said, the only time I've ever used both was when both batteries were weak enough to not crank the motor (only happened once) then as soon as it started I switched it to 1 battery.

    An isolator is what you need is you want to run with 2, so that the isolator determines which battery will get the charge, not both.

    Most of us with day use boats don't go to the expense of an isolator however. A switch works just fine as long as you remember what battery you're using.

    You can switch between 1, 2 and Both while it's running, but never switch it to "Off" when it's running, unless your switch has the regulator/protector thingy that will protect the alternator/regulator. Those aren't as popular once again, due to cost and necessity.
     
  14. charlg

    charlg New Member

    745
    Jan 7, 2007
    Newton, MA
    2000 280 Sun Sport
    / Raymarine C80 w/ Radar / Sirius weather
    / SH GX5000S VHF
    Twin 350 Mags / B1's
    / Corsa exhaust
    Ok. I guess I'm clear on the function of the battery switch. But, I have one 'starting' battery (#1) and the other one is the standard battery (#2).

    Should I start the boat with #1 and switch to #2 when running??

    How does the starting battery affect the switch?
     
  15. Searay Jim

    Searay Jim New Member

    271
    Oct 3, 2006
    DFW
    240 Sundeck
    540cid w/BIII
    The switch doesn't care what kind of battery is where. It just "connects" the one you choose.

    Now, when you say 1 is a "starting battery" and the other is a "regular battery" what exactly do you have for batteries? A regular battery to me is a standard wet cell starting battery like we have in our cars. Another type of battery might be a dry cell or deep cycle which generally are designed for a different function, but many have the CCA's to be used as a starting battery just fine.

    I now have 2 deep cycle's. The #1 battery is a big D31 deep cycle Optima Blue Top (gel) but it have way more power than I need for a starting battery now. Even the #2 D34 Optima has enough power if it's charged.
     
  16. charlg

    charlg New Member

    745
    Jan 7, 2007
    Newton, MA
    2000 280 Sun Sport
    / Raymarine C80 w/ Radar / Sirius weather
    / SH GX5000S VHF
    Twin 350 Mags / B1's
    / Corsa exhaust
    I pulled out the manual for my '03 240 SD.

    "Remember to switch to BOTH batteries before starting the engine. This will assist the weaker battery during engine start. Also, in the BOTH position, both batteries will be charged during engine operation."
     
  17. wrvond

    wrvond Member SILVER Sponsor

    200
    Aug 27, 2016
    West Virginia
    1995 Sundancer 270
    7.4 liter Mercruiser w/Bravo II
    When in doubt, read the manual.
     
  18. Loyd Dinneen

    Loyd Dinneen Member

    177
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    How does that work when you have two engines each with it own battery and a switch that says 1/2/off/both. Does 1 start one of the engines and 2 the other one with both starting either one?
     
  19. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    Loyd, your motors charging systems are sensitive to bad batteries and high charge rates unless you have the alternator belt driven system

    For single engine , wire a isolator across the battery switch. No matter what position you select the other battery will charge thru the isolator.So if #1 is engine and #2 is electronics/house both will charge with the motor running and still be isolated with the engine off.

    For twins , I wire position #1 for engine starting for each engine . Position #2 is connected across both switches by a battery cable and the charger lead is connected there too
    From the #2 post I wire in a on-off switch for the 2 house batteries .House batteries charge thru a isolator or Blu-Sea system while under way of from the charger while on shore power
    Done this way you can use all 4 batteries together to get atleast one engine started battery switches to ALL, and ON
     
    Last edited: Sep 26, 2017

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