3 bank charger for 30 weekender

Discussion in 'Classic Sea Rays' started by johngus, Nov 19, 2017.

  1. johngus

    johngus Member

    244
    Dec 27, 2008
    Amity Harbor,NY
    1988 300 Weekender
    Twin 350 Chevy
    Straight Inboards
    Hello,my old blue 3 bank charger has died.looks to be original to this 88 boat so got the moneys worth.whats everyone else replacing with?was looking the promariner 3 bank 20amp charger.my old charger says 40 amp.is that 40 amps for each bank or 40 banks total.just want to ensure I have enough output when using shorepower and 12V accessories if the promariner will work for what I need.gonna have to stand on my head to replace as its in the front of the engine bay mounted to the bulkhead.any other good choices for chargers?
     
  2. Wylie_Tunes

    Wylie_Tunes Active Member

    474
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    Likely its 40A total, which is typical.

    20A for 3 banks would be a very minimum as that covers about a sum of 200 Ah in battery capacity. Which promariner series are you looking at? I would want with more amp output if you plan to you is as a power supply in a sense. The Prosport series is not ideal for this. Good charger for their price point, but not ideal for using to power loads.
     
  3. Joecool12

    Joecool12 New Member

    12
    Sep 10, 2017
    NJ
    1986 410ac
    1983 340 sedan bridge
    1987 Sea Ray sorento
    Twin 340 mercruiser
    I agree I would look more towards 40 amp for 3 banks as 40 amps is total output. Also keep in mind a power supply and battery charger are slightly different. I have the same battery charger on my old 34 sea ray and 41 sea ray. When i added a second charger for additional batteries I noticed the lights brighten as the charger turns on and brings the battery voltage back up to 14.4 to 14.8 volts. The power supply was fixed on at 14.8v consistently but current would increase as the demand went up. Some don't mind the light issue but it annoyed me.
     
    QT1 likes this.
  4. SCORPIO

    SCORPIO Active Member SILVER Sponsor

    Apr 7, 2008
    Delaware
    1989 300 DA
    Twin 5.7 Merc Alpha I
    I installed a Promariner 1230 P three bank charger on my 89 300DA this summer as one of the outputs on my old Charles charger quit. I find this to be a good size for this boat. It is supposed to output up to 30 amps per bank, in my case three batteries so it should be plenty. Has nice digital readouts and an optional remote for monitoring at the helm.
     
    QT1 likes this.
  5. Wylie_Tunes

    Wylie_Tunes Active Member

    474
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    Just to clarify, the ProNautic is not a 90 amp charger, but has what they call distribute-on-demand. it can deliver its full 30A capacity on one bank, if needed.
     
  6. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    That was how my Promariner 40amp worked. 40amps total spread across the 3-banks. It was really neat to watch the digital readout and see what it was doing. It was the best upgrade I ever added to our 260DA. When the time comes, I will add the exact same one to our 44DB.

    Bennett
     
  7. Wylie_Tunes

    Wylie_Tunes Active Member

    474
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    in this case, your charger would only be capable of deliver up to 13.3V per bank. if all 3 banks were dead, it would deliver its total capacity of 40, or 13.3V x 3. Distribute-on-demand allows the charger to send ALL its output out on just one bank, if that bank was that low, and the other banks were not very low.

    Both designs have their pros and cons, but are very different.
     
  8. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Correct, but it would favor the one that needed the most if that makes sense. The starting battery always stayed charged by the altenator so that left most of the juice for the 2-house batteries.

    Bennett
     
  9. SCORPIO

    SCORPIO Active Member SILVER Sponsor

    Apr 7, 2008
    Delaware
    1989 300 DA
    Twin 5.7 Merc Alpha I
    How are you getting amps by multiplying volts by the number of batteries?
     
  10. Wylie_Tunes

    Wylie_Tunes Active Member

    474
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    Sorry, I hit the "V" instead of the "A". Should read 13.3A per bank not voltage. Sorry for the confusion.
     
    SCORPIO likes this.
  11. Loyd Dinneen

    Loyd Dinneen Member

    163
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    Just put in a promariner 13 amp charger 3 lead mainly to charge and maintain the three batteries I have on the boat. Two are engine batteries that also runs the house and the third is for mainly running an inverter for the fridge which uses about .1 amp per hour. I have a 2.9 amp solar charger to keep the center battery topped off when the charger isn't plugged in which will be most the time since I don't have overnight power at my slip. It will be interesting to see if it will be enough to keep the fridge going on a lower setting. The lead outputs are 5a,5a,3a, and they seem to be doing a sufficant job of keeping the batteries topped off even though it is a low amp charger. If your batteries are completely dead then you need to use a high output charger to get them back up to 12.6 volts.
     
  12. bobeast

    bobeast Dance the Tide SILVER Sponsor

    308
    Oct 22, 2017
    Isleton, CA
    2002 310DA
    350 MPI w/V-drives
    I just installed a Promariner 1240 P on my 310. Two outputs go to my starter and house banks respectively. I plan on setting up a charge station for a dinghy trolling motor battery and wire that to the 3rd output.
     
  13. Loyd Dinneen

    Loyd Dinneen Member

    163
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    The charger keeps up really well with all the batteries and with the fridge running and I just installed a second house battery so doubled my reserve, It also works well with my 50 amp solar charger and inverter as my fridge is 120 volt and is so far doing fine on a medium setting.
     

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