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Unread 05-13-2019, 01:32 PM   #381
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Default Re: Bit the bullet Leaf Lithium build

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Originally Posted by agpfl View Post
500 Watt (9amp) or larger charger would work just fine for you if you are just charging overnight. No real need to go above 1200 watt (20 amp) charger.

If you are not cutting off the load side with the BMS, just choose a BMS that can handle more amps than your charger puts out. I usually buy the 30 amp BMSs since they are only a couple bucks more than the 20amp, but not as crazy as the higher amp BMSs that would be needed to cut off the load side.

See the attached diagram of how mine is wired. I keep it as basic and simple as possible. My BMS protects against over charging and also balances. This is an economical and easy way to run.
Thanks, you answered one of my major questions, regarding the BMS and the amp rating. I really do appreciate it.
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Unread 05-13-2019, 02:49 PM   #382
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Default Re: Bit the bullet Leaf Lithium build

I would suggest that you start a new thread on the subject of your lithium build. That way specific matters\issues\questions can be ask by you and responses are kept in that one thread.

You could certainly continue on posting about your build in this thread, but it just may be easier in a separate one.

FWIW
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Unread 05-13-2019, 06:04 PM   #383
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Default Re: Bit the bullet Leaf Lithium build

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Originally Posted by DaveTM View Post
I would suggest that you start a new thread on the subject of your lithium build. That way specific matters\issues\questions can be ask by you and responses are kept in that one thread.

You could certainly continue on posting about your build in this thread, but it just may be easier in a separate one.

FWIW
Sorry, did not mean to hijack the thread. Thank you for pointing that out.
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Unread 05-13-2019, 08:35 PM   #384
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Default Re: Bit the bullet Leaf Lithium build

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Originally Posted by MDLNB View Post
Wow, relays and diodes and tons of money spent. Must be nice to have an expensive hobby. No insult meant, just envy.

Here's the thing. I am on a fixed retirement income, also with hobbies. Unfortunately, I have to do it the cheap way.

I have purchased seven leaf modules to give me a 48/58 volt 66ah pack. I am replacing very weak Trojan lead acid batteries(6x8v).

I plan on using a cheap BMS and monitor my cells manually. Therefore, I need to know some basic specs. I know I want a 14S 48v or 58v bms but I do not know how to read their specs when it comes to what I need for my lithium pack other than that. I just need it to stop charging at a maximum voltage and turn off the drain at a minimum level. I understand that part. However, how do you read their specs when it comes to 20/30/40 amps on the description? I understand how they are to be wired, but need to know if I am buying the right board, without having to get those high dollar ones. I need the bare minimum load balancing benefit.
Second question: When it comes to lithium charging and chargers, what is the minimum charging amps that I want. There are many type of hobby chargers out there and electric bicycle rated chargers, etc. I do not feel the need for a programmable charger, just one that will charge and cut off. I understand that a BMS will cut off the charging to the individual cell once it reaches the max. I have seen chargers that span from 4amp to 15amp. I think my CC DS power drive is rated at 15 or 17amps. I know I can't use that one, just saying.
Before anyone tells me all the reasons for relays and cut off switches, I live in a community where golf carts are used daily. I have not reason to store it and if I did, then I would disconnect the battery cable.
Yes, many of you will say that I am attempting a "redneck" slop together job, but if my cart works fine with a 48v lead acid pack then why wouldn't it work well with a 48v lithium pack? Unlike some of you, I cannot get into all the schematics of the electrical system and digital monitoring via a BMS and monitor. I am going to use a simple and cheap BMS and simple lithium charger and then check my cell voltage with a hand meter.
If there is anyone out there that has the patience to "dumb" this down to my level, I am sure that GOD will reward you at a later time.
List of needed info, summarized:
Minimum specs for cheap BMS
Minimum specs for cheap charger

Sounds simple to me, but it may be hair pulling and frustrating to you. If I am "dreaming" then I have already committed to a Lithium "Leaf" pack of seven, two cell mods which is supposed to give me a rated 48+ volts.

Thank you for your patience and generosity of sharing your information.
Mine was a bare bones very basic lithium conversion. It worked great! I moved it over to another cart just fine. Here is the start of the build..

Picked up another cart
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Unread 05-13-2019, 09:28 PM   #385
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Default Re: Bit the bullet Leaf Lithium build

I am one of the cheaper builds on here. I used Chevy Volt cells, but Nissan Leaf are easier.

generally... Lithium is safe as long as you don't over heat, over discharge, over charge.

I had a 47ah pack that i later doubled to 94ah. 47ah may do ok for you depending on how you use your cart and what mods it has. I use a 360 watt (5 amp) charger and it is mounted in my cart. It takes a while to charge, but works and I always have it with me.

I don't have a BMS that can handle the amperage the cart pulls, so I don't have a BMS controlled low voltage cutoff. To account for that I set the low voltage cutoff in the controller to be far higher than is necessary. My cart will cut off at 45.5V which is 3.25vpc if all my cells are equally balanced. I am using a 14 cell pack (2P14S). If you use a 13S or 12S your LV cutoff needs to be different. Please note, just using 45.5V as the LV cutoff is not the safest option... As a lith cell is drained it will lose V much more quickly. There is a 'knee' and after which the V will plummet. So if my other cells are all at 3.35V then I could have one cell at 1.95V... That would be a pack I would not want to use again as the risk of fire during a charge is much higher on cells that have been stressed. I also check my cells for balance all the time... I'm rather paranoid about it. When I first was putting my pack together I had 4 cells that were more charged than the rest and it took a while to manually balance them. But the interesting part is that while they were quite far apart when in the middle 3Vs, when I got to 4.05vpc they were all balanced... The differences between the cells were magnified at lower voltages and that's where a lot of danger can be found.

Fuses are your friend, but a fuse won't protect you from fire and overcharged cells can burn. Think Samsung Phone burn, but MUCH bigger.

Not trying to dissuade you. Just want you safe. I love my lith pack. The pack never self discharges, if I leave it at 53.4v then it will still be 53.4v two weeks later. No more acid. Much less weight. Lots of benefits and so long as you give it respect, you will be happy.
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Unread 05-14-2019, 02:57 PM   #386
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Default Re: Bit the bullet Leaf Lithium build

I don't have a LVC either but I have a very annoying beeper. I do have HVC to protect my pack from a charger failure.
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Unread 05-18-2019, 09:26 AM   #387
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Default Re: Bit the bullet Leaf Lithium build

Quote:
Originally Posted by BobBoyce View Post
Mine was a bare bones very basic lithium conversion. It worked great! I moved it over to another cart just fine. Here is the start of the build..



Picked up another cart
Bob, can you message me, getting ready to do lithium and wanted to have you program a controller for me.

Sent from my Pixel 2 XL using Tapatalk
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