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  • Diesel
    replied
    Originally posted by BrianS
    The Perko switch is needed if using the battery combiner because the batteries are not placed in parallel until the system is charging, ie the alternator is turning. Therefore, it is not possible to start the boat from Bank 2 without using the switch (in the event that Bank 1 dies).

    With an isolator or relay the batteries are placed in parallel when the key is switched to the "Run" position, so both batteries are used to start the boat at all times.

    The Perko switch is designed to sit between your batteries and the rest of the system, ie starter, alternator, etc. It provides total control over which battery is used for starting and which is being charged. It is ignition protected and as long as you use the proper guage cable I see no problem with using one.
    Sounds confusing

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  • Diesel
    replied
    Originally posted by prostar205
    Anyone have a comment or answer on my above posted question???
    You will be fine. The only time I try to match batteries is when they are hard wired parallel with no isolator. In this case you will be using an isolator between the two banks of batteries and a charging current will be applied most of the time the banks are connected which will further prevent any damaging discharge between banks.

    Leave a comment:


  • Leroy
    Guest replied
    FYI, http://www.yandina.com/acrobats/C150Data.pdf

    From earlier thread: http://www.tmcowners.com/teamtalk/pr...p?t=2183&pp=40
    Last edited by ; 03-24-2006, 08:12 AM.

    Leave a comment:


  • BrianS
    replied
    The Perko switch is needed if using the battery combiner because the batteries are not placed in parallel until the system is charging, ie the alternator is turning. Therefore, it is not possible to start the boat from Bank 2 without using the switch (in the event that Bank 1 dies).

    With an isolator or relay the batteries are placed in parallel when the key is switched to the "Run" position, so both batteries are used to start the boat at all times.

    The Perko switch is designed to sit between your batteries and the rest of the system, ie starter, alternator, etc. It provides total control over which battery is used for starting and which is being charged. It is ignition protected and as long as you use the proper guage cable I see no problem with using one.

    Leave a comment:


  • Leroy
    Guest replied
    Prostar; I would say not ideal, but probably not a problem. Main concern is difference in voltage causing one battery to charge more or not allow the other battery to charge enough. I personally like the relay best since it is automatic. You could either measure the voltage on each battery or look at the spec's to see how closely they match. The Optimas are AGM and the starting battery is lead acid so they are indeed different battery types.

    Leave a comment:


  • prostar205
    replied
    Anyone have a comment or answer on my above posted question???

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  • prostar205
    replied
    A few more questions.

    If I go with a isolation relay, like the Borg Warner R3098 or Sitnger SR200, since ALL the batteries will be in parallel once the key is turned to the ON position, is this a good idea with two difference battery types. My main starting battery will be a standard lead-acid DEKA marine battery while the AUX battery (stereo) is two Optima Blue Tops?

    Would I also have an issue with just using the Perko switch?

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  • prostar205
    replied
    Zberger -

    Suggestions in place of the Perko????

    Borg Warner replay?
    Battery Combiner?
    Isolator?

    Need input.

    Thanks

    Leave a comment:


  • zberger
    replied
    I still have no idea why you guys are bothering with perko's........................................... ...........

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  • prostar205
    replied
    Diesel -

    Is it OK to add a wire, of appropriate AWG, from the + terminal of the alternator direct to the + terminal of Battery 1 and also keep the 8-10 AWG that goes from the alternator to the starter?

    Regarding the use of the Perko, since I already have it and do not have a relay, I think I am going to use the Perko for now. If I determine it is a PIA, I will add either a Battery Combiner or the BW relay.

    Leave a comment:


  • Diesel
    replied
    Originally posted by prostar205
    Jim -

    Then, there is a 2 AWG battery lead going from the starter to my Perko Battery Switch COMMON terminal. I did not find any wire going directly from the alternator to either battery. This is how my dealer wired in my isolator and battery switch and it worked fine.
    IMHO this is a very dangerous way to wire the system. If by chance somebody turned the perko the wrong way (to off) it will instantly kill the regulator in the alternator. The charging lead off the alternator should always be hard-wired (no switch) to at least one of the batteries(banks). It is the safest way to do it, no exceptions.

    I understand why the Perko switch was used and I discourage it in any dual battery setup simply because the relay does the exact same thing, is automatic, and costs less.

    However in your new setup I do not understand why you would keep the Perko switch at all?? If you just want to cut power I would install it on the 6-8ga lead that powers the rest of the boat harness. As a rule I do not place any switching devices between the charge and starter circuits of the engine harness and engine battery(banks). Too much current and too much risk IMHO.

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  • JimN
    replied
    OK, I forgot that they just go to the battery cable at the starter since the battery is farther away from the alternator than in a car or truck. Sorry about that.

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  • prostar205
    replied
    Jim -

    I took the boat apart this weekend and learned alot of stuff. First, I have an orange wire, probably 8-10 AWG, going from the POS lead of the alternator direct to the starter. Then, there is a 2 AWG battery lead going from the starter to my Perko Battery Switch COMMON terminal. I did not find any wire going directly from the alternator to either battery. This is how my dealer wired in my isolator and battery switch and it worked fine. Now, I am getting rid of the isolator and running only the Perko switch (for now, I may add a Borg Warner Relay down the road or a battery combiner). So, what am I missing. I know a few threads back you said there should be a wired going from the alternator direct to the battery - which battery, Engine or Stereo???

    Thanks for the help. I will post another block diagram later this evening of how I am planning on wiring my batteries and Perko Switch.

    Leave a comment:


  • prostar205
    replied
    My starting or engine battery will be in the compartment on the driver's side of the engine and the stereo or AUX battery bank (2 Optimas) will be on the passenger side of the engine. So, I would say they are relatively close together.

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  • JimN
    replied
    IIRC is 'If I Remember Correctly' Just one of the snazzy internet abbreviations.

    Are the second batteries going to be close to the primary battery? With the switch or re;ay in the 'Both' position, all batteries will receive charging voltage, but if the switch is in either the 1 or 2 position, only the primary battery will get that.

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