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Unread 04-23-2019, 02:29 PM   #31
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Default Re: Nissan Leaf batteries set up.

From the graph that the previous poster shown was in short, charge it when you hit 48v. In my use it will be light use, so it could be that simple. This is also a quick solution. I figure if I wish down the road, I can replace parts as I see fit. I'll probably just charge with the Anderson PP since it is very versatile.
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Unread 04-23-2019, 02:49 PM   #32
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Default Re: Nissan Leaf batteries set up.

as i dont know if the board will handle 250 amps i ordered these and bolted them on top of the green board. although i ordered 2 sets because you need 6

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Unread 04-23-2019, 03:20 PM   #33
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Default Re: Nissan Leaf batteries set up.

ysrman, the busbars should go under the board in direct contact with the pads in the battery module, the bolts (and threaded inserts inside the module) are not designed to carry current.

Unfortunately that would leave a gap under the board for the middle balancing tap.

Actually that may not work since I have not seen the underside of that circuit board to see if any traces would be shorted.

Here is a picture of how the pouches attach to the terminals, it is similar to the Alltrax tabs with the caged nut underneath.

The current path is supposed to be between the exterior copper surface and the busbar, using the bolts may cause heat, specially in the pack connections.
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File Type: jpg Leaf_cell_pouch_connections.jpg (51.8 KB, 0 views)

Last edited by Sergio; 04-23-2019 at 05:02 PM.. Reason: Added picture.
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Unread 04-27-2019, 09:02 AM   #34
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Default Re: Nissan Leaf batteries set up.

Maybe I missed, but what are you going to use for a charger? I see 14s Chargers, but I seem to remember something that a simple 48v power supply is needed. If this is the case, If I can wire my Club Car charger to stay on, allowing the BMS to disconnect the charge voltage, couldn't I just use it?
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Unread 04-27-2019, 01:42 PM   #35
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Default Re: Nissan Leaf batteries set up.

Get a proper charger designed to charge a 14S Lithium pack! Do NOT rely on the BMS to terminate the charge. That is your failsafe backup.
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Unread 04-27-2019, 02:05 PM   #36
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Default Re: Nissan Leaf batteries set up.

I wired two server power supplies together and use that as my power supply for my turnigy reaktor 1000w 30a charger. My battery is only 10s though. The power supply was cheap only 50 bucks and does a good job.

Sent from my LG-G710 using Tapatalk
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Unread 04-28-2019, 08:27 AM   #37
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Default Re: Nissan Leaf batteries set up.

Yeah, I am sending this "powersupply" that I got from Techdirect back. For one, it's just a power supply. Second, it's massively used. If I need a bench power supply I already have one. So I'll look for a better charging solution. The second item is, with a single pack (ie: 7 Leaf Cells) are you concerned about amp draw? In the configuration of 7, they are rated at 200 Amps. Now, I'm not sure what my 96 DS Club Car draws, but I'm betting it's more than 200 Amps. To get the 300 Amps I'm reading about, you would need two of these. Again, I'm not sure what these really draw amp wise.
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Unread 04-29-2019, 09:13 AM   #38
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Default Re: Nissan Leaf batteries set up.

So, not 100% knowing what this motor draws, I ordered the Chargery Charger and BMS setup, the 16T. I figure with this, I can see for sure what it draws. I think most of the high amp draw comes from zero to max speed as quick as possible, and high torque situations. But with this I should be able to monitor.
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Unread 04-29-2019, 09:34 AM   #39
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Default Re: Nissan Leaf batteries set up.

Anyone using Alltrax controllers that have logged data knows how much current a Motor can consume.

Even a stock motor can use more than 300 amps during acceleration, depending on throttle rate and minimum voltage drop.

Cruising will probably be around 70 amps.

A power supply that can only provide Stage 1 charging (constant current) should bring a lithium pack to about 85% charge, to charge more than that You need an absorption phase where the current is regulated (constant voltage).
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Unread 04-29-2019, 11:41 PM   #40
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Default Re: Nissan Leaf batteries set up.

I got the pack in. I got the pre-made box with the cheap bms. I've ordered a chargery charger and bms. I'll strip off the pcb and all of the original wiring and start over. I'll take some pics as I wasn't able to find a pic of the insides of this thing. Really, it's pretty simple. My only concern is the amp draw. I've seen on some forums that the 230-300A a golf cart can draw will kill these packs. But here, I see different. So we will see.
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