Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 21
  1. #11
    Join Date
    May 2009
    Location
    Dallas, TX
    Posts
    880

    Default

    Al,
    Its just not that simple.
    You can have over 11 volts but if the ratio of depleted reserves in amp/hours is large enough combined with the continued stereo draw that is large enough the voltage will drop like a rock and the Blue Sea will open again. This isn't a problem for minor systems but is a real world challenge with BIG systems when you cross a threshold in stereo size and stereo battery bank reserves.
    Having 200 amp/hours at 80 percent (11.5 volts) depletion is far more challenging than having 65 amp/hours at 100 percent (10.5 volts) depletion. Its more an issue of current versus voltage. Voltage is just the consequence.
    Seriously depleted batteries can be a real liability to the charging system and the ACR/VSR operation.
    Like I said its complex and a moving target as systems become larger.

    David
    Earmark Marine

  2. #12
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    Quote Originally Posted by EarmarkMarine View Post
    Al,
    Its just not that simple.
    You can have over 11 volts but if the ratio of depleted reserves in amp/hours is large enough combined with the continued stereo draw that is large enough the voltage will drop like a rock and the Blue Sea will open again. This isn't a problem for minor systems but is a real world challenge with BIG systems when you cross a threshold in stereo size and stereo battery bank reserves.
    Having 200 amp/hours at 80 percent (11.5 volts) depletion is far more challenging than having 65 amp/hours at 100 percent (10.5 volts) depletion. Its more an issue of current versus voltage. Voltage is just the consequence.
    Seriously depleted batteries can be a real liability to the charging system and the ACR/VSR operation.
    Like I said its complex and a moving target as systems become larger.

    David
    Earmark Marine
    Thanks David. I think my system is more in the moderate category but I did send you an e-mail with the details of my system and look forward to hearing your thoughts on improving my set up, if necessary.

    At a minimum, it sounds like I need to install a digital voltage gauge at the helm to keep an eye on the stereo bank battery voltage.

    Al
    Al

    2006 Mobius LSV

  3. #13
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    I spoke to David and he shared with me a slightly different wiring scheme that eliminates the need for a resettable breaker between the ACR and the battery. In my set up, I have the ACR wired directly to the battery with an inline resettable breaker on each leg. This allows me to open the breakers and isolate the ACR when I have the onboard smart charger hooked up.

    With Davidís scheme, the ACR is wired to the output posts on the switch instead of directly to the battery. So when itís time to charge the batteries, you can put the switch in the OFF position and the ACR will be isolated. This accomplishes the same thing as opening the breakers in my scheme. Itís a more elegant solution that mine since it does not require additional components (the resettable breakers).

    Hope that makes sense. This is only relevant if you are going to charge your batteries with a smart charger.

    Below is a revise schematic showing Davidís scheme in red.

    Thanks David for sharing this with me.

    Al



    Al

    2006 Mobius LSV

  4. #14
    Join Date
    Aug 2010
    Location
    NW Houston
    Posts
    101

    Default

    Great write up & sketches are definitely worth a thousand words, etc. I'd been scratching my head on how to incorporate a dual bank charger with a battery switch/VSR combo. Thanks.

    I only have 90 rated amps of stereo, one Optima blue primary battery, one Optima blue stereo only battery, a Blue Sea Dual Circuit Plus Switch, and a SurePower 1314-200 VSR. I picked up a 140A alternator (more than I need, but the price was too good to pass up). Rather than upgrading the wiring in the old harness, I'm thinking of running an additional wire to help carry the load. If I wanted to land a second feed (properly sized & fused, of course) directly off of the alternator output, where should it tie into the last diagram?

  5. #15
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    It should land on the pos terminal of the starting battery. Newty upgraded his alternator so you might ask him what he did.
    Al

    2006 Mobius LSV

  6. #16
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    Quote Originally Posted by cab13367 View Post
    It should land on the pos terminal of the starting battery. Newty upgraded his alternator so you might ask him what he did.
    Actually, the power feed from the alternator goes to the starter and is connected to the 2/0 cable that connects the starter to the starting battery. This is how the alternator current goes back to the starting battery. So if you want to add an additional cable, I would run it back to the starter.
    Al

    2006 Mobius LSV

  7. #17
    Join Date
    Aug 2010
    Location
    NW Houston
    Posts
    101

    Default

    Thanks, Cab. Forgot to mention this is on an old Supra Saltare. While I love my Supra forum brothers, I found your diagram & ya'll seem to be bit more electrically inclined over here.

    I traced the alternator feed wire (looks to be 10 or 12 ga) back to the engine loom. From there, it wye's into one wire headed up to the helm and one to the 50 amp breaker. It jumps from the breaker to the starter solenoid & then to the starter where it would tie into the same terminal as the battery cable back to the primary battery. Should I bypass the breaker and solenoid & go directly to the starter? Just upgrade the wiring along the same path (won't I risk popping the 50A breaker with a 140A alternator)? Or land directly to the primary battery, or battery switch, or VSR? Now I've gotten myself totally confused??

  8. #18
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    I'm really not qualified to advise you on this. We are getting a little over my head now. All I know is that if you want to run a feed back to the battery, you definitely want to land it on the battery, not the switch or vsr. The vsr will sense the charge and combine your batteries when appropriate so both batts will get charged.
    Al

    2006 Mobius LSV

  9. #19
    Join Date
    Jul 2010
    Location
    Pacific Northwest
    Posts
    235

    Default

    Thanks cab for the diagram... did my set-up last night. Made things a lot easier and quicker than trying to understand all the lines without a diagram. Only difference was I went with the ProMariner 20 3 Bank charger than your set-up. Everything worked so far in the garage, I guess I'll find out tomorrow if I get any feedback with my amps and such as some people get. Thanks again!
    2004 Moomba LSV Blue

  10. #20
    Join Date
    Dec 2006
    Location
    Tigard, Oregon
    Posts
    3,016

    Default

    Quote Originally Posted by bbuhtz View Post
    Thanks cab for the diagram... did my set-up last night. Made things a lot easier and quicker than trying to understand all the lines without a diagram. Only difference was I went with the ProMariner 20 3 Bank charger than your set-up. Everything worked so far in the garage, I guess I'll find out tomorrow if I get any feedback with my amps and such as some people get. Thanks again!
    Great! Glad to know it helped you out.
    Al

    2006 Mobius LSV

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •