00:00:02
Let’s talk about batteries [Music] [Music]
00:00:12
[Applause] this right here is a 14 s 48 volt module battery module made out of seven of
00:00:24
these leaf battery packs right as you know the Nissan Leaf released in 2010 is the world’s best-selling electric car
00:00:37
all sales total three hundred and eighty thousand units by December of last year and nearly half of those are here in the
00:00:46
United States so with so many cars on the road there are a lot of these batteries floating around so how come
00:00:54
I’ve never played with those you ask well they’ve always been too expensive everyone wants like more than $100 per
00:01:01
little module they’re really attractive they come in this little canisters but then it’s not a lot of battery in there
00:01:07
to justify for the price that most people want so I paid a visit to techdirect Club on eBay
00:01:14
in their local facilities here and let me tell you they have warehouse fooled and full of these batteries right these
00:01:20
batteries come back from manufacturer for one reason or another so they are testing all these batteries to make sure
00:01:28
that they all have good voltage on them and then they randomly test some of the modules so they send me a kit to put
00:01:34
together so let’s test one of these modules first and then let’s build it into a 48 volt little system put
00:01:41
together so that we can run a 48 volt inverter all right here is a leaf module these are made of pouch cells inside
00:01:53
right but these are the metal canisters where they come they come with little holes so that you can stack them
00:01:59
together you can put all thread and then you can connect them together right so it’s got three terminals because it’s
00:02:08
got two pouches so 3.7 volts plus 3.7 volts these are advertised as 500 watt hours
00:02:16
less capacity test one of these guys to see where they’re at all right here’s the setup
00:02:22
I this one we’re only discharging one cell rent and using this guy to discharge it
00:02:29
and then that’s a regenerative charging we’re putting that energy back in here the reason I’m doing that is because it
00:02:36
allows me to go kind of fast right I’m doing 16 amps right now let’s do 25 it’s a little bit between five 17 18 21
00:02:48
23 we go 24 which is crazy because that 25 amps only equals about 100 watts this is such a difference okay so let’s look
00:03:04
at what the supply is doing look at that so we’re putting in about five amps into the Tesla battery and we’re taking off
00:03:15
about 25 amperes so at this point should take about two hours let’s see if you can push it a little bit harder let’s go
00:03:22
30 this charger is smarter than the last version that I had which kind of fried itself by me pushing it hard
00:03:33
this is a little bit smarter so it will prevent in of the MOSFETs from just destroying themselves
00:03:43
so there we go it’s discharging 30 amps these cables will run warm but they are rated at 40 amps as they have a 40 amp
00:03:58
fuse in here so at 30 amps it’ll be it’ll be okay it’ll be fine yes although I think all the way up to 40 I’m gonna
00:04:20
do their file let’s say alright we’ll see how long it takes we’ll come back and see at the end all right here we go
00:04:30
so this just finished and look at this so it took about 66 minutes just a little bit over an hour it took thirty
00:04:40
eight point four eight and powers so this module here is 38 amp hours went all the way down to 2.5 volts so yeah
00:04:51
that’s pretty much all that there is available there so it’s a 2.9 right now it kind of bounced back up so now I’ll
00:05:00
charge it back up to match it where it was before and then yeah we’ll put the whole module back together
00:05:09
all right here the kid comes with a seven of these modules it’s got the BMS and then it’s got these plates right
00:05:19
here to put it all together along with some my hardware you know screws and all threads and stuff let’s put this thing
00:05:28
together first thing the modules so you gotta pay attention
00:05:35
to this positive negative positive negative positive negative positive negative positive that’s you got to make
00:05:49
sure those are like that you have to get this guy so we put this guy here here so of course at this point the BMS
00:06:55
connections are pretty standard like any 14s BMS a diagram pretty much looks the same so you just have to follow that all
00:07:04
the way through the pack so now I set the coverage just set to like cut in here
00:07:25
it’s kind of beat up there but last thing you’d have to do its connect the cable into the BMS there are two term
00:07:45
Istres you get some captain tape run one in this battery here for example then the other one I can run it over here
00:07:57
there we go there you go so have any of those kind of a mess in there but not to worry because this we have a cover for
00:08:12
that and there you go there should be power there
00:08:18
if the MOSFETs are on oh my go 54 volts this battery here would be capable of doing about two and a half kilowatt
00:08:30
right this is a about two kilowatt hour and it’ll do about two and a half so a little bit over one see with this BMS
00:08:41
system in here so what do I think about these batteries I think I think they’re great they’re they’re the form factors
00:08:50
nice they come in these mail canisters that you can bolt together and then you can you know very easily put bus bars
00:08:57
across you know seven of them and do 14s which is perfect for 48 volts that’s the good stuff right the bad stuff is that
00:09:07
they’re still kind of expensive right 170 170 dollars a kilowatt hours somebody that and the reason why they’re
00:09:15
kind of expensive is because at least the ones that I got are like somewhere around 50 percent degradation right so
00:09:23
50% of the original capacity is gone these were supposed to be 500 watt hours per module but the one that I measured
00:09:30
here is 38 amp hours times 3.7 that’s 140 watt hours times 2 that’s 280 right so that’s 280 when it’s supposed to be
00:09:39
500 so yeah it’s like maybe 60% some I got 55 60 % so that’s the bad right but there are
00:09:47
tons of them right and so if you need to build something big and quicks and you can you can order these and build them
00:09:53
into large battery packs now this company is also along with this system that I used to put it together the
00:10:00
plates and the bolts and stuff they’re also designing bigger systems right this is the little 2 kilowatt hour one and
00:10:08
there’s gonna be like a 8 kilowatt hour or something like that and then it all the way to like almost 14 kilowatt hour
00:10:14
and so they’re working on these systems so that they’re kind of plug-and-play you you just you know you get them you
00:10:20
bolt them together you connect the bus bars you connect the cables and put the BMS is and then
00:10:26
and then you can just charge them you can you can connect solar to them and then collect you know connect your
00:10:31
inverter on the other side and then there and they’re ready to be used so there’s definitely good solutions coming
00:10:36
from them so if you’re interested in these batteries I’ll put the link where you can get them down in the description
00:10:40
I don’t think if you’re watching this video and if you haven’t already subscribe well hit that button and if
00:10:46
you’re already subscribed hit that notification bell so that you know when I upload new videos alright we’ll see
00:10:52
you guys on the next one [Music] [Music]
