Precedent 2008.5 DIY Lithium build

[Bbbbrass]

Sorry about the links. I tried using the forum tool instead of pasting. If anyone wants one, just let me know. Augiedoggie, what prismatic cells did you go with?

[augiedoggy]

Originally Posted by Bbbbrass

Sorry about the links. I tried using the forum tool instead of pasting. If anyone wants one, just let me know. Augiedoggie, what prismatic cells did you go with?

https://www.aliexpress.us/item/22518...andl_shipto=US

https://buggiesgonewild.com/showthread.php?t=188399

[Bbbbrass]

Originally Posted by augiedoggy

at least the scrap price for batteries has gone up... I got over $60 for my old batteries when I dropped them off at an interstate battery a couple month ago..

I’ve got a little pile going soon….

[Bbbbrass]

Originally Posted by augiedoggy

https://www.aliexpress.us/item/22518...andl_shipto=US

https://buggiesgonewild.com/showthread.php?t=188399

Thanks, nice build! Not sure how I missed that earlier. I ordered some 60Ah cells from them a year ago. One was bloated, and hasn’t kept its SOC as well as the others. I didn’t want to roll the dice on it for someone else. That enclosure looks great. Compression is key for those cells. Did you capacity test each cell?

[augiedoggy]

Originally Posted by Bbbbrass

Thanks, nice build! Not sure how I missed that earlier. I ordered some 60Ah cells from them a year ago. One was bloated, and hasn’t kept its SOC as well as the others. I didn’t want to roll the dice on it for someone else. That enclosure looks great. Compression is key for those cells. Did you capacity test each cell?

I did not test them. From the reviews I read from others who have, I expect my cells are likely only somewhere around 75ah (the barcode states they were originally 86ah CATL cells.) They were not bloated. I did have what I thought was a runner when originally balancing the cells but now they appear to be discharging and charging and keeping a good balance.

[augiedoggy]

Its interesting that you chose the big bms vs just buying the headway option with the relays and fuses still attached and using a 30a bms to control those.. that would effectively bring the build cost down to less than $600 completed with shipping. of course you would lose the bluetooth and cell monitoring capability which I guess would also defeat your purpose of setting the low state of charge threshold.

[Bbbbrass]

Originally Posted by Bbbbrass

lucky battery 4 that has a literal hole in it. Picture to be added later....

Not sure why I can't edit my earlier post... Here is the holy battery (all genuflect)! There used to be a terminal there. It's surprising how much lighter this one felt!

[Bbbbrass]

Originally Posted by augiedoggy

Its interesting that you chose the big bms vs just buying the headway option with the relays and fuses still attached and using a 30a bms to control those..

Since it's for a friend with renters using it, I didn't want to try something unknown. He is a sailor and also prefers massively overbuilt components (as do it).

One issue with the Beast pack for golf cart use is you really need to remove all the cells and test them individually. Since you have to take the whole thing apart, it's not a time-saving to go with the original design. The other issue is the contactor is set for 36V max.I've debated using a small BMS to control it with the BMS feeding the 48-12V converter and the contactor tied to the 12V fuse block, and will try that in a future build.

[augiedoggy]

Originally Posted by Bbbbrass

Since it's for a friend with renters using it, I didn't want to try something unknown. He is a sailor and also prefers massively overbuilt components (as do it).

One issue with the Beast pack for golf cart use is you really need to remove all the cells and test them individually. Since you have to take the whole thing apart, it's not a time-saving to go with the original design. The other issue is the contactor is set for 36V max.I've debated using a small BMS to control it with the BMS feeding the 48-12V converter and the contactor tied to the 12V fuse block, and will try that in a future build.

ahh didnt realize that. battery hookup claims they have been tested and balanced.. makes aliexpress option more enticing to me other than the long wait.

[Bbbbrass]

Progress made:

Discovered an upgraded(ish) motor from previous owner, Admiral MOT-A2. http://https://www.revolutiongolfcar...or-club-car-iq
(Random links from sites I don't know that have more details. Support BGW sponsors!)
https://evdrives.com/admiral-mot-a2-...lus-precedent/

Solenoid is only 2 years old (was installed by current owner).
http://https://www.albrightinternational.com/products/su60/"]http://https://www.albrightinternational.com/products/su60

Stock Curtiss IQ controller. (Sorry for blurry pic) I've never had to do an OBC bypass/removal. Looking forward to it! http://https://www.ultimatecartparts...CON-CT203.aspx

Tub needs to be cleaned.

Dagnabit, I still can't get the hyperlink tool to work!