All right, it's time to make another battery video. It's been a while so today I want to talk to you about this module as you know. Uh I We have the 24 volt version of this module 7s. This has been selling on our website for a while.

Uh, but now I Wanted to try something different in order to make 40 48 volts right? A 14s? What you'd have to do is put two of those 24 volts side by side and it was a two kilowatt hour. Um, battery right? And so that works if you're doing a large uh, you know, installation or a big battery system or whatever. So that works. But then a few people were asking is like hey, what about you know for like an E-bike or something smaller like like a 48 volt at one kilowatt and I was like well, let me see, can we make that and so yeah, we could just flip the batteries around and these packages that they come.

They come in these little modules so you just flip them around. You could do uh, 14s in that same space. So this module is exactly the same size as the 24. but it's configured in a 14s.

Uh, this is wrong. Here's this: AP it's supposed to be 4p. I think I changed this in the final version. Uh, this is still the the pre the Prototype thing.

but yeah, we're gonna have to change that. That's a 4p. Uh, 14 s right? So 14 000 series and then four in parallel. So four? That's one.

So now what happens is that it cuts down on the power. Uh, where the other one I could I rated it at 80 amps continuous this one I'm rating it at 50 amps and then because it's only half the cells right? and then um, the capacity. Well it's the same one kilowatt hour or 1080 Watt hours as it's in here. But then the amp hour in amp hours is half.

That is 21.2 because well, the nominal voltage went up to 51.1 51.1 and the max charge rate is now 42 amps. Uh, this is from the spec sheet of the cell. so I just put it in here so that you can see that these are really good when it comes to cycle life. Uh, and so I put it in there.

Okay, now let's test it. I don't have a BMS on this one. but I do have this guy right here which is gonna help us kind of monitor the cells I Want to check a few things. uh mostly just check that that none of my traces are getting hot I Know these cells can do 50 amps right and so no problem there.

but I want to see the stuff that we build the the you know, the boards and stuff and I want to see how that behaves, uh, on their load and so that's why we're gonna put a thermal camera in here and I'm gonna see this and then this is uh, we're gonna load this the max I Think this one will only do like 30 amps and so we'll need to uh, run a secondary I want to see what it does with 30 amps. If we start to see some heat buildup and stuff, then we know that's not going to do the 50 amps denied to redesign this, but if it does just fine with the 30 then then we'll do another test where we do the full power and then we'll see how this goes. So let's turn this on and then start loading this with Uh 30 amps. So now it's connected and this is powering on 21 amps I Think that's what it's pulling right now.

21 amps, about 900 Watts Uh, the voltage is sagging a few volts. It's supposed to be somewhere around 58. Now let's look at the uh, the uh. the the cells in the individual cells here.

look at that. 54 3.9 3.9 3.9 Yeah, it's all pretty even I Wish this unit had a graft because then you could see instead of having all those numbers there that are harder visualize what the cells are doing right. Um, 3.883 That one's a little bit low. The number one.

What about number 14? Yeah, and the number 14 3.8 but then all the other three now. So I think they're all around 3.8 C it's pretty even voltage drop. It's okay, nothing here. Okay, let's put the thermal camera and see what this thing is doing.

Okay, after a few minutes I'm seeing a hot spot right there. Now it's still nothing. all right. This, this battery is still pretty cold.

but I Start: that's a differential right there, right? So that's starting to heat up and that is the exit point for the positive positive. What about the negative over there? Yeah, the one in the negative is fine. Um, the positive over here is also heating up a tiny bit. We might have to do better in here.

Let's see. let's see. so this is at the half power. Obviously, at full power, this is gonna be that much more right? Okay so now I have installed a second uh in burger and now we're pulling 47 amps very close to the 50 Max that that battery should be able to do.

So let's look at the thermal camera and see how it's doing. I would expect to see yeah, a lot higher temperature rise there. Thank you. All right so the batteries are done.

The voltage was already really low and the amperage went crazy high. So that's why the batteries are so hot. 70 and 70. Let's cool them over here.

Um yeah, the batteries were already like down below three volts. Uh, and this thing alerted me really quickly. so it's fine, but 70 degrees that's hot now. I Guess we can look at the Uh footage here to see if that was going all the way up consistently or if it just got really hot just at the end.

once the batteries uh uh, reached the end of their capacity. essentially. so we just remove one kilowatt hour off of these batteries. Uh, in 20 minutes.

Basically right. because it was. it was two kilowatt, uh, at a rate of two kilowatt, right? So 2C we just loaded these batteries with 2C and uh, that's what we're seeing there. the heat there.

So here we go. The test is done. This is a hot module. You know it's at the top of its thermal capacity right? and so, but it started.

We did 20 minutes, Exactly 20 minutes. It started at 42 amps, 43 amps and then it went all the way there. Like when I checked it, it was at 56 amps. So that's the reason why this got so hot right? So I think I'm gonna lower this to like 48 48 amps uh or 45 amps because the and then I'm gonna pair this module with a 45 amp BMS that has a thermistor and that's going to go in there and then we'll make the hole in there so that we can put the thermistor into a cell and then you know, like attach it in there.

So I think the the Pcbs, the Box all this stuff, all the bus bars and stuff all the stuff. It's pretty good. It passed the test, it got just as hot as the cells, right? So the limiting factor here is not the PCB but again, it's the cells. So this is a 48 45 amp continuous.

Um, uh module, right? So of course, if you were to use this like on an E-bike or whatever, you could definitely do 2025 maybe to 3 000 Watts Uh, as long as it's not just continuous, as long as you're not going up a hill for more than 20 minutes, right? Uh, if you are, then you're gonna have to limit that around 1800 watts. Uh, which is 45 amps right? Um, but other than that, just for takeoff and stuff like that. Yeah, you can load this this this this module. It can give you 100 amps, you know, on bursts.

Yeah, but this right here is a continuous rating, right? And so 50 amps it gets hot. So maybe 45 amps it'll just give it a little bit. Uh, breathing room there. So I will change that figure to that.

and then uh yeah, these are gonna be at Jack35.com Uh, as a 52 volt Boston power swing module. All right. thank you for watching this video. We'll see you guys on the next one.

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