I swear this dude makes some very clean battery setups.
@RBEMotion11 ай бұрын
Haha I appreciate it man! Thanks for watching
@zpepe11 ай бұрын
He's 💯% guilty of that offence
@skfunk455011 ай бұрын
What a brilliant video. bit scary in some parts but now at least I know, battery cost is the biggest cost on a board and it's well deserved when done like this.
@RBEMotion11 ай бұрын
Thanks so much! Glad you enjoyed. It can definitely be a bit nerve wracking building big batteries like this but I'm happy to share the knowledge
@skfunk455011 ай бұрын
@@RBEMotion Thank you and look forward to the next part
@RBEMotion11 ай бұрын
@@skfunk4550 Appreciate your support!
@ExplorewithZac11 ай бұрын
When your skateboard needs to pull a trailer home.
@RBEMotion11 ай бұрын
Hahaha more like when I need to 0 to 40 in 3 seconds
@noka777610 ай бұрын
awesome video man. What spot welder were you using???
@RBEMotion10 ай бұрын
Thank you! I use a Kweld.
@NoahZimmerman11 ай бұрын
Great video! One question. I thought that people didn’t recommend using hot glue to hold cells together because it cracks and becomes brittle after time. Is this a different kind of hot glue that doesn’t do that?
@PatrickECleary11 ай бұрын
+1 What kind of glue is that? Looks different from regular hot-melt.
@jittcrazy188211 ай бұрын
@@PatrickEClearysilicone
@RBEMotion11 ай бұрын
Certain people have argued about this for a long time but in my experience good hot glue lasts perfectly fine. I have cells I glued in 2017 that are still holding together today. Some people argue for silicone, but others argue that since silicone is so soft, it lets the cells rub more than hot glue. Hot glue is easy, fast, and holds well. It is my opinion that it is the best for now. Silicone is a huge pain, takes a long time to dry, and gets absolutely everywhere. No judgement to people that would like to use it though, it works as well. As a side note, all of the groups are further wrapped in fishpaper, and then taped off tightly with fiber tape. After that, they're welded together. I would be surprised if any of the cells ever manage to move at all.
@RBEMotion11 ай бұрын
It's just a brand of black hot glue that I've been using for a while. It's a high-heat kind of hot glue, and not all hotglue is created equal. Check out the ProjectFarm video for his opinoins, I've used Gorilla hotglue and this black stuff from Trendbox.
@RBEMotion11 ай бұрын
While that is a good option, I do not really use that to glue P groups together.
@jittcrazy188211 ай бұрын
Love it! Keep em coming!
@RBEMotion11 ай бұрын
Thank you! Glad you enjoyed!
@uhjyuff209511 ай бұрын
Last step would be wrapping the groups in foam to reduce rubbing and vibrations.
@RBEMotion10 ай бұрын
Yeah foam gets packed in the sides on this particular pack, as well as the thin layer beneath it in the enlosure.
@gialongtonthat540411 ай бұрын
25:17 maybe use some parts of silicone heat resistant mats?
@RBEMotion11 ай бұрын
That's a pretty good idea, if they were thin enough that would work really well. Despite how thin the fr4 is, it still kind of made the nickel stick up a bit which makes the joint a little tighter than I'd like, so thickness is important.
@jeanshavershian40064 ай бұрын
Dude it’s crazy I have the same build! But I’m between 18s6p or 16s7p with these cells.´ for you the range is would be better to not start my 2nd pack in 16s ? Never did 18 before and I’m a bit worried about the capacity lost : 16s 32ah 18s 27ah 😅
@RBEMotion4 ай бұрын
If you don't need the extra speed just go with 16s, which esc are you going to use?
@hellcatmd763511 ай бұрын
Hi I’m building a battery pack 12s 6p 18650 cells ,I have a 60amp bms,will 60amp enough or I need more.
@hellcatmd763511 ай бұрын
My motor are 5000w vesc 200 amp continuous.
@RBEMotion11 ай бұрын
Well, technically, it depends on if you want to run your discharge path through your bms or not. I run all of my BMS setups with the discharge bypassed, because I always want to have brakes, and don't ever want the possibility of having a cutout from overvolting or over drawing. If you bypass discharge it doesn't matter at all. If you run the discharge through the bms, it may not be quite enough
@SC-rk6zt5 ай бұрын
I love your content and builds you remind me a lot of Le Drib who flies FPV. Can someone recommend me a place to buy the braid I can’t find any. I have 120x 21700s for the pack but I still need some materials.
@RBEMotion5 ай бұрын
Thanks for the compliments! Braid can be tough to find, but there is some available on amazon if you look for desoldering wire or copper braid, something like that. You can also find it on aliexpress. "Tinned copper braid"
@SC-rk6zt5 ай бұрын
@@RBEMotion Thank you! I wasn’t sure what to look up and that is perfect.
@RBEMotion5 ай бұрын
@@SC-rk6zt Awesome, glad you were able to find it.
@eBoard3R11 ай бұрын
⚡⚡⚡
@RBEMotion11 ай бұрын
🙏🙏🙏
@zpepe11 ай бұрын
Quick question - How do you determine what fuse size I should have for a battery pack? When I built my DIY I did not put one in but I'm noticing a trend with more and more people putting these in. What prompted folks to add these? Thanks mang !
@RBEMotion11 ай бұрын
Well off the bat, it's not a battery pack fuse. It's a charge port fuse, to protect the bms if the charge port were to be shorted or plugged in backwards. Usually I spec the fused based on how fast the bms can charge, which for LLT bms is usually 15a. So I'll put in a 20a or 25a fuse in there to help protect it. It's somewhat debated as to its necessity since most BMS are good at protecting themselves. However, I've replaced a melted charge port before so I still see value in it.
@brentfernandez634210 ай бұрын
Which spot welder do you use?
@RBEMotion10 ай бұрын
I use Kweld exclusively, I have two actually.
@zpepe11 ай бұрын
I'm only 19mins so sorry if you already covered this.
@RBEMotion11 ай бұрын
I didn't, but I replied to your other comment
@justinadams544610 ай бұрын
could you get rid of all the soldering braided ribbon if you you folded over the nickel tabs toward each other so they overlap? then you can use the spot welder like on the ends of the cells. or would that not be durable enough to vibration?
@RBEMotion10 ай бұрын
You COULD, but it would no longer be a flex-tolerant pack. Also, welding nickel together like that is not super durable in the first place. If you were to use a PCB like Lacroix you could weld the nickel to that, but that's not exactly very accessible.
@kitmarshall40845 ай бұрын
What gauge wires for discharge and where to buy?
@RBEMotion4 ай бұрын
I used 10awg high strand silicone wire for the discharge cables, you can get them on Amazon or Aliexpress. I like to use BENTECHGO on Amazon.
@zpepe11 ай бұрын
Haha... Battery pack build!
@RBEMotion11 ай бұрын
Yes indeed! Thanks for watching
@ohite2 ай бұрын
bro could not have picked thicker cable for charge port
@RBEMotion2 ай бұрын
I used 12 awg for that, which is admittedly slightly overkill, but I planned to charge with up to 20a at times, so it wasn't a big deal to oversize.
@veymaxboard11 ай бұрын
Inazuma, from genshin?😂
@RBEMotion11 ай бұрын
Haha is there an Inazuma in Genshin? I haven't played that game in 2 years 🤣 But no it's just Japanese for lightning
@ohite2 ай бұрын
ur iron not powerful enough for braid
@RBEMotion2 ай бұрын
It worked just fine, and has continued to for the other packs I've used braid on. Also, fwiw, I've improved my technique since I built this and can do braid much faster. This was the first braid pack I did.