03-07-2019, 12:41 PM | #21 | |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,215
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Re: Lithium hunting cart overhaul
Quote:
My answers in RED above. I hope this helps!! |
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03-07-2019, 10:47 PM | #22 |
Gone Wild
Join Date: Nov 2012
Posts: 379
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Re: Lithium hunting cart overhaul
Thanks, Dave. Now, I've got to figure why Chargery sent me this massive thing they call a relay, but which I would call a 12volt 600amp solenoid. It's in the manual, so i guess it's right. manual is here. It's just confusing to me, probably because I am not an electrical expert. I specifically asked him about this and wondered why it should be 12v and not 48v. He said
for New BMS16T, the relay controller voltage is 12 V, you do not need 48 V relay, and the relay controller can output 3A max. current on NEW BMS16T. My guess is that what he is saying is that the relay controller in the BMS uses 12volts to open the relay, and a maximum of 3amps. And the reason the thing is 600amps is that its from the positive side of the battery to the load. I hope someone more knowledgeable will come along and tell me that's right. |
03-08-2019, 07:17 AM | #23 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Lithium hunting cart overhaul
According to the manual when you use between 8-16 cells the BMS has an internal 12v voltage reducer that is used for powering the relays.
The relay(s) are powered the entire time the BMS is ON, regardless if the cart is On or Off as long as the individual cell voltages are between the set limits. You want to press that "stop" button while parked and not charging to reduce the discharge on the pack. |
03-08-2019, 07:56 AM | #24 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,215
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Re: Lithium hunting cart overhaul
^^^^^-----What he said-----^^^^^^
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03-08-2019, 10:48 AM | #25 |
Gone Wild
Join Date: Nov 2012
Posts: 379
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Re: Lithium hunting cart overhaul
Thanks, Sergio. Here's another question, so I turn the BMS OFF, I should be OK? Or should I put some kind of disconnect in there? I've looked at Anderson disconnects and I can't find a high amp one. Also, I wonder if there is some way to rig up an "off" button on the dash for the BMS. that would be cool.
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03-08-2019, 11:03 AM | #26 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Lithium hunting cart overhaul
Pressing the "stop" button will power down that big solenoid which will remove power going to Controller and voltage reducer (like disconnecting your existing pack positive battery cable).
The only power being drawn at that point is the quiescent current used by the BMS itself which should be very small. The first time you leave the cart OFF (stop mode) for several days, just measure the pack voltage before and after to see if any significant drop occurred with the pack. |
03-08-2019, 04:12 PM | #27 |
Gone Wild
Join Date: Nov 2012
Posts: 379
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Re: Lithium hunting cart overhaul
Thanks so much. Looks like there is also a way to turn the BMS off by switching it to external power, or at least that's what the manual seems to say. We shall see when I start putting it all together next week.
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03-12-2019, 09:48 AM | #28 |
Gone Wild
Join Date: Nov 2012
Posts: 379
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Re: Lithium hunting cart overhaul
So, I've stripped the old cart down and starting measuring things. If you will recall, I've had to split my pack because it will not fit in one piece in a 1993 club car ds electric. (It will in a gas). I split it at 8 modules and 6 modules. Unlike the 7 module set, the 8 module set will not fit in the middle without some modification, which I'm currently figuring out right now.
More importantly, however, I am trying to figure how how to secure the pack. Attached is a picture of one my sets of modules. As you can see, the rod through the pack is just long enough to bolt the end plate to the pack. that's the same on all the bolts. Do you have any simple suggestions for securing the pack? the only one I can currently think of is to go by some longer threaded rods. My question then would be, however, is their some torque specification for the pack? Obviously, I don't want to tighten the nut on the rods too much. I'm probably going with a wooden encasement like the one in this thread, as it is the simplest for me to build. Thanks so much. |
03-12-2019, 12:20 PM | #29 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,215
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Re: Lithium hunting cart overhaul
Pack securing......Bob Boyce said it best. He stated to use 8mm (yes metric). I used 5/16" but the American thread pitch is "sharper" than the metric pitch. The thin case metal want's to bind up on the 5/16" where Bob stated the 8mm went on like a greasy hot dog.
I did get my 5/16" to work....but I had to grind off the all-thread sharp edges. Avoid all that and get 8mm. For the tightness.....I just took 'em up snug and checked there would be no openings from any wiggles it would go through. |
03-12-2019, 12:38 PM | #30 |
Gone Wild
Join Date: Nov 2012
Posts: 379
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Re: Lithium hunting cart overhaul
Why wouldn't something like this work? And yes, I realize that is a smaller battery, but concept is the same. Also, Dave, I have to admit I'm a little worried about undoing the compression of the modules. I would assume there are some kind of specs for retightening them, and I don't know them and can't find them online.
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