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Post by CaptWoody on May 14, 2015 15:27:55 GMT -6
Wow, that is a lot of amperage from your alternator. The VSRs that I am are off are for a much lower amperage rating, something in the 15 amp range. It is not intended to carry heavy amperage to jump start a dead battery, just a light charge to top it off while underway. You would still need a perco switch or similar for jump starts. I'm not familiar with an ACR.
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yolo
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Location: Back to Manasquan Inlet, NJ
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Post by yolo on May 14, 2015 17:02:16 GMT -6
Wow, that is a lot of amperage from your alternator. The VSRs that I am are off are for a much lower amperage rating, something in the 15 amp range. It is not intended to carry heavy amperage to jump start a dead battery, just a light charge to top it off while underway. You would still need a perco switch or similar for jump starts. I'm not familiar with an ACR. Woops, i wrote 120 then 60 and 60, i meant to write 70 with 35 and 35. 120 came from the max rating on the blue sea ACR that I have. And 70amp is max output, when the boat is at idle its most likely around 60amps. They also have smaller ones for smaller alternators. I have a 225 so my alternator will be bigger(est) you will see on the outboards. Smaller motors will have lower amp alternators (i think there is as low as a 15amp one) and then bigger boats will have more amps 120 and even wayyyyy more. I was thinking about putting a bigger one on mine because of the power steering pump that the Mercs use BUT i dont feel like spending the money after all the work Ive done to it. And i think i might have lost you on my first comment. An ACR (automatic charging relay www.boatersland.com/bep710-140a.html?gclid=CjwKEAjwj9GqBRCRlPram97Xk3ESJADrN7Ieu22qSnDd6oYQhiK0gwS4jJoa2I0tvwqhijKuQ_v1dhoCqvbw_wcB) is a battery isolator as we are talking about; it also has a starting isolator. Its purpose is not to jump start batteries, its to regulate the charging of the batteries from the alternator (when the alternator is producing power....motor running). The VSR (voltage sensitive relay) I am talking about is, or at least i thought, the same as the ACR; just a different name from a different manufacture (http://www.jamestowndistributors.com/userportal/show_product.do?pid=15306). Looking quick at the jamestown website and wiring for the VSR it looks like you can wire it to charge both at the same time and then have it share when one battery reaches charge. Either way works fine, just depends on how you are set up.
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yolo
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Posts: 626
Location: Back to Manasquan Inlet, NJ
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Post by yolo on May 14, 2015 17:13:27 GMT -6
www.yamaha-motor.com/assets/service/manuals/2003/lit-18626-05-00_441.pdfPage 4-28 For combining the batteries to start you could use a selector switch,just disconnect the starting cables and move over,carry a set of jump cables or carry one of those small lightweight jump packs like I do. I learned of it in the manual then read more about it on THT. I made my own cable rather than buy the Yamaha one. Thanks for sharing phil! looks like the accessory charge wire is very small so I'm guessing it wont pull power if charge is needed/used for starting. Im going to give Yamaha a call tomorrow to see what they say about connecting the batteries with the accssory charge also connected to the house battery. Im thinking i will still use the switch that comes with the add a battery package (https://www.bluesea.com/products/7650/Add-A-Battery_Kit_-_120A) which will keep the batteries isolated but give him the "just in case" And then just use the charging from the motor like you have discovered for us! One less part that could break/go bad and costs less than buying him a jump pack. And if there is a problem with the accessory charge being connected while using the accessory battery in a start im thinking ill just use the ACR or maybe put a breaker on the charging wire. I have to think about it more. Thanks again for sharing the info, this is a great thing to know! p.s. talk about light weight jump packs, i have one now thats about the size of a two iphones put together. Im going out somewhere and ill snap a picture of it. Its in my truck. its amazing how far they have come with these things.
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Post by gnrphil on May 14, 2015 17:30:34 GMT -6
I would think you could run starter cables to the switch from the house battery and the accessory charge wire straight from the motor to the battery, my guess would be that if you needed to combine for starting it wouldn't hurt anything as your only pulling amps for a few seconds while starting and the charge circuit wouldn't be doing anything at that point anyway. I have a 50amp fuse on the accessory charge wire as that is what the OEM Ymaha cable has.
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yolo
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Posts: 626
Location: Back to Manasquan Inlet, NJ
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Post by yolo on May 15, 2015 19:56:13 GMT -6
Talked to yamaha, they said the aux charging circuit is not connected to the starter at all so it will not pull the cranking amps. Meaning if you do connect the starting battery and the house/aux battery then you will not pull the 100s of amps used during starting through that small wire. Nice! Saves us some money over here.
Still going to put that switch in so he can use both batteries if needed without a problem but its nice knowing there will be one less part in the boat for him, one less thing to go wrong.
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Post by Juan on May 16, 2015 6:10:28 GMT -6
All this "auxillary charging circuit, VSR vs ACR, Perko switch, 12 Volt, 24 Volt, Amps, etc, etc"... has my head spinning. All I want to know is: Would there be any advantage if I can (and Can I) hook up the extra charge wire from my Yamaha to the house battery that runs my electronics since both my house and start battery are connected to a perko switch? If the perko switch is set to "both 1 & 2" don't both batteries charge while the motor is running? Is the advantage of hooking up the additional charge wire from the motor to the house battery only that both batteries would charge without having to flip the perko switch to "both"?
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Post by gtightline on May 16, 2015 6:30:14 GMT -6
I am neither a professional mechanic, nor an electrician, but it would make sense to me that it would charge both batteries when set to 1and 2...if they are both used to crank when set to 1 and 2. It would make sense to me that they both would also charge when set on 1 and 2.....just my "2" cents, but what do I know...
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Post by gtightline on May 16, 2015 6:39:25 GMT -6
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Post by gnrphil on May 16, 2015 13:22:51 GMT -6
All this "auxillary charging circuit, VSR vs ACR, Perko switch, 12 Volt, 24 Volt, Amps, etc, etc"... has my head spinning. All I want to know is: Would there be any advantage if I can (and Can I) hook up the extra charge wire from my Yamaha to the house battery that runs my electronics since both my house and start battery are connected to a perko switch? If the perko switch is set to "both 1 & 2" don't both batteries charge while the motor is running? Is the advantage of hooking up the additional charge wire from the motor to the house battery only that both batteries would charge without having to flip the perko switch to "both"? Yes both batteries would charge without switching to both.
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