All right, it's time to test these modules at full capacity. Let's do it. What are we talking about here? Well, the Boston swing modules. We tested them a few days ago and we discovered that this design here on the top only allows for about 50 amps to be removed. There's a bottleneck right here and then a bottleneck here and here. Uh, this was the worst by far. It got up to 100 degrees Celsius at around 80 amps, right? So at 50 it'll get warm, but when it won't get dangerous, right? But of course the battery sells the swing each one of these ones could do 15 amps continues and there's eight of them. so you should be able to get about 120 100 Something like that. About 120 amps continues after these cells without them getting too hot. And so now today we're going to test that by connecting the positive leads and negative leads directly into the current collectors here so that they don't have to travel very far on this bus bars here. So therefore we're gonna test to see how hot it gets at a full uh hundreds I mean whatever this thing can do, it's a 3000 watt inverter. We're gonna load it up the Max and then just hope for the bets that nothing is going to melt. Uh, but I think it's gonna be okay because these boards were not hot and the cells were not hot at 80 last time. So I think we'll be able to do up to 120, no problem. So let's start this test of course. obviously. Uh, the load is very simple. Batteries connected to this inverter and then this inverter is connected to this um, heater. and so this heater could pull quite a bit of current. And then we're going to record this whole thing with our little trusty, uh, turbo camera. Okay, here we go. Um, we're gonna turn on our heater here and we're gonna see how much. Oh there we go. Do those two match. 22, 28, 30, 31. They match. Now this one only goes up to 100. that's why I'm using this one. but this one's higher quality. So there we go. So foreign. Okay, so there we go. 80 amps. So we are loading this battery with 80 amps and look at that. The cells are sagged a bit. not that much. so we'll see how this uh module does. Thank you! All right? We plugged a second unit so that we can get this to 100 amps. Let's see here. it's at 63, 71, 80. 90. a hundred. So that's uh, the uh. this one's overloading right there, right? But this one is showing 103. so we can remove this guy. Now How hot are is this already? It's been a few minutes. It's going at 100 amps. The cells are lukewarm. Just yeah. like just lukewarm. Um, not quite yet as warm as a human like if you were to touch someone's back. All right. So of course, the thermal camera is going to have a better reading on this. But just to give you an example, Uh, the bus bars are also lukewarm. They're not getting hot at all. The cables also lukewarm. Nothing's heating up here. Cells are slightly below or below. Um, but that's you know, that's full load right there. Yeah, all right. and we are doing full load now. 120 amps in this module. That means every cell is seen about 15 amps which is where they're rated and the modules are getting around 36C That's not very hot. That's just a hot day or less spring day. Foreign. So that concludes our test. We, uh, the inverter is gave us the alarm already so that means the voltage is low. Let's take a look at how hot it got. According to this, it got to like 51 and it's now it's cooling down to 49 so it's about 50 degrees. Celsius Let's take this camera and then get it closer to the module so we can show exactly where and what got hot. All right. So here we go. The cells got to 57 according to this thing according to this camera. 60.

60 Yeah, 60 is warm. That's my hand there. Oh yeah, yeah, that's that's one. Um, how about these ones? Yeah. 60. The same thing. The bus bars do not seem to have gotten that hot. So the bottleneck here now is the cell. So we we reached the limit of the cells 120 amps continuous. Um, that's the limit there, because now, yeah, they're getting hot. Look at that 60 degree. Oh, that's funny. It doesn't seem like this one's as hot. that second one seems to be hotter than the second. Maybe it's just because it's in their sandwich between the two. But um, here we go. You can see inside these holes go inside the modules. Oh, 68. that's hot in there. Yeah, these black ones right here. These are the the actually no, the positive, but that's the casing of the cell. So that's why I think there are darker, which means they're cooler and then these ones right Here these are the negatives which have the little dot. These these cells are backwards like that. The button right? And so the button is getting hotter because there's less surface for it to dissipate the heat there. So there we go. We hit the max of the cells and now the cells are cooling off at 59 degrees. Yeah. So 100 120 is the max and that's that. Uh, matches what the data sheet says for these cells, right? So all right. So there we go. This is essentially uh, 3C cells, right? Uh. capable cells and the module does support that. What gets hot here is the cells and not the BMS and the current collectors. Uh, not the PM, the Pcbs, or the current collectors, or the little, um, the nickel strips. right? we're using a bit. Uh, actually the production ones are gonna have slightly bigger than that. these are undersized. We opted to go with this size which is bigger so that means it's gonna transmit the current a lot easier than that module that we have over. Which is good news because if these can carry the 15 amps. Oh, and by the way, this module had a lot of these had a single spot Weld you see that one has a single spider well, single spot oil, single spot oil. So I wanted to test that if we can get away with doing a single spot well or we have to do multiple right? And so this shows that. yeah, single spot oil can carry the 15 amp load. uh, including on even even on this small thin, uh, nickel strip, right? But since we chose to use the thicker one, um, we are going to be okay. so this this module is probably capable more right? but the cells are not. so as long as we can get full power out of the cells. I'm happy now. I am gonna redesign in fact I have already redesigned this top board here. We moved these sections over here further this way and then the the traces now are going. they're thicker and so we've also moved these all to the center right. and so what we did is we we put um a section that you can put a nickel strip across these in here so you can have a big trace on the bottom and then a big trace on the top. that is Bridge with nickel strip. So we're going to test that I Think depending on how that goes, we might have to double up on these here, but we might be able to get full power off of this top portion here. Um, without having to go through this because this adds a little bit. if you're putting multiple of these modules in, this kind of adds complexity. Now you have to space them apart so you can have the room for these cables. And now you have an asymmetrical thing in here. you know? Um, hopefully this is going to work where we can do that or at least above 100 amps. if you can remove about 100 amps off here, it might work for a lot of people. so those are the further development that it's going to have. But for now, these modules work. Obviously you can get 50 amps through here or 120 amps through through the main things here. and so we're gonna add this input to our listing on our website and these are available at Jack35.com Now if you're watching this today, these are currently and special because today is uh Cyber Monday So we have uh I think I don't know when the sale is going to end Uh I Haven't talked about people to see but I think for the next couple of days I Think we're still going to be able to get I think 10 off of a store-wide uh inventory and so you'll be able to get those 10 discounts for what they're gonna cost regularly, right? So if you're interested, click on the link below putting a Jack to be five. Thanks for watching! We'll see you guys later! Bye.