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72V lithium pack?
Hey guys, Im JUST ABOUT to break down and start a leaf pack build. But if Im gonna do it, Im gonna do a 72V build. I have confidence in myself to do a 48V build (done a ton of research, etc.) But Im not sure what the differences would be at 72V. Would you have to do 2 x 36V packs? Or is there a single BMS that can handle everything? I dont usually drive long distances at all. So AH is not a big concern. Just want a drag racing cart honestly. Thus I suppose 10 or 11 batteries would be all I need? Thanks for your help!!
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Re: 72V lithium pack?
I made my own leaf system a couple years ago that is 36 volt 10 battery and since I’m running 2S2P. I charge it with a 10s BMS. Even if you went to a 72v 10 battery system you would need a 20s BMS OR split it into two separate 36 volt systems with a couple massive “winch plugs” to combine them after.
I guess it would come down to personal preference and if you had any of the parts already. If I was going to go to 72 volt I would do the two battery system because I already own one of the 10s BMS and a charger. I would only have to get another 10s BMS. Sent from my iPhone using Tapatalk |
Re: 72V lithium pack?
Do you have the controller already? What is the max V of the controller? My 48V controller can handle up to 62V so when I built my pack I went 58v. If your 72V controller can handle 84V then a 19S (78.8V at 4.15vpc) or if you want to push it closer a 20S (83.0V at 4.15vpc) pack would work.
Another thought is how much of a drag cart are you looking for? I have the "baby" 300 amp Alltrax with a stock TXT48 motor on 23" tires and if I turn up the controller a bit I pop wheelies. So if you are wanting a fun cart to go faster than your buddies, that can happen on a 14S pack and there is a lot of other people here running 14S packs. If you want to roast tires at the 1/8th mile drag strip then obviously you need a lot more then what I'm talking about... |
Re: 72V lithium pack?
If your just looking at dusting the guys and not serious racing... What controller and how many amps are you planning for? I would probably build a 10 module, 20S1P, use a generic BMS and charge to only 4.10v/82v. Less stress on the cells and controller.
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Re: 72V lithium pack?
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Im gonna check and see what the max voltage of the SR72500 series is (probably 84). And build accordingly. The BMS that I THINK can handle it all is the chargery BMS24T. Can anyone fact check me on that? Sent from my SM-N960U1 using Tapatalk |
Re: 72V lithium pack?
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Re: 72V lithium pack?
Ok. So by math, I should be able to do an 84V pack with the alltrax SR72500. That would be done on 10 leaf cells (I THINK). My big question then would be, where do I get a charger for such a set up?? Would I be limited to a 72V pack at that point? Id like to have a decent charger that I could keep on board.
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72V lithium pack?
Split the ten cells into two groups of 5 and charge with 42 volt charger(s) and connect them with two massive winch plugs https://uploads.tapatalk-cdn.com/202...e7ce0c54f4.jpg
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Re: 72V lithium pack?
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https://www.ebay.com/itm/Delta-Q-72V...8AAOSwvgheLzta Many of these come pre-programmed for lead-acid batteries, but can be loaded with Lithium algorithms (82.044v or 83.16v would work). The only caveat programming kit is required (https://www.ebay.com/itm/Delta-Q-Pro...0AAOSwdIFX0~aQ) but many shops that service golf carts and fork lifts have those. |
Re: 72V lithium pack?
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