EVAssemble packs

I'm not sure, but it almost looks like that white goop on the various semiconductors against the heatsinks is not thermal paste, but rather silicone adhesive. If it is, then those parts may be thermally *insulated* from the heatsinks.

I have seen that before, in a bunch of 32" LCD TVs I fixed in a sports bar that kept blowing power supplies, especially in the hotter parts of the bar near the kitchen and stage. I know that there are silicone adhesives made that can conduct heat, as they are used in some of the watercooling systems to "glue" the harddisks and such to the cooling blocks, but whatever this stuff was, it wasn't very thermally conductive, and it looked exactly like the shiny white goop in the two pics posted so far (and was also smeared around on nearby components like that, as well as used to glue down toroids, caps, etc., to the PCB). I've forgotten the brand name in the intervening two or three years, but I think it started with an A but I'm not sure. I'd probably know one if I saw it. I had to scrape off the stuff from the non-dead parts and heatsinks, and put normal thermal paste in there in the correct tiny amounts, replace the blown parts (and a bunch of failing 85C caps with 105C Panasonic longer-life caps) and then they all operated correctly afterward, better than ever according to the owner.
 
right at a cost of AU$50 I have sent it back to him. I've sent him the tracking number and asked if he can send me a replacement at the same time. He wants to wait until he gets the returned charger. He'll probably get it repaired and send it back, which I could have done here in Aus.

we'll see.

Gow.
 
so if you coulda repaired it there, why not do that?

like i said, he sent you a charger that worked and it broke. we all have chargers that broke after they were used for awhile, you are lucky he will even take it back, imo.

not sure why you guys feel free to trash this guy, slandering him as a crook and all the other trash talking when he seems like a decent chap just trying to make a buck in the new EV world.

not everybody has an iphone with internet access so they can see what is in their email inbox when they go back home to the rural provinces to visit their family during holidays.

we tried to help you figure out what was wrong. i even offered to examine it to diagnose the problem if you were close by.

people do the same thing to li ping, trash talking about his BMS when nobody even has a clue how they work, much less what could be wrong. ask them specific questions in order to diagnose and instead they just say they are not gonna worry because ping is sending a new one without question. ever wonder why he has to charge so much more now for stuff than he did originally?

there is no free lunch. michael did not manufacture that charger. he just found a source in china to supply you with one. you can expect the new one to break too, 92V is really really hard to push current at. it is just too bad you could not examine it so we coulda learned something outa this. or even helped you fix it. all imho.
 
OK, so why does he have a website stating stock numbers for items he sells? Yes, you are right, the charger did work FOR 5 MINUTES, does that constitute a conclusion of contract to you? Imagine driving the car off the lot, it dies, and the vendor says "oh well, it worked for a while"

If I had purchased this charger locally (unfortunately I cannot) and it had died after 5 minutes, I would expect it to be exchanged for a new one straight away. Which is what I expect from Michael.

I have spent time in China, and from experience people running a company trading internationally HAVE MOBILE COMMS.
 
With all due respect, if I was running any sort of business internationally I would have access to my emails within an hour let alone a week.

When all came through correct in the end I gladly posted on this site that Michael was an honest dealer as everything I ordered did turn up. But that's not to say I was wrong for getting very twitchy when my emails after payment were not answered for 8 days.

But I am happy with his products...... I think a bit of quality control would save hassle on both ends but then again stuff just sometimes breaks it's a fact of life with electronic items, sometimes you just get a bad item.

dnmun said:
so if you coulda repaired it there, why not do that?

like i said, he sent you a charger that worked and it broke. we all have chargers that broke after they were used for awhile, you are lucky he will even take it back, imo.

not sure why you guys feel free to trash this guy, slandering him as a crook and all the other trash talking when he seems like a decent chap just trying to make a buck in the new EV world.

not everybody has an iphone with internet access so they can see what is in their email inbox when they go back home to the rural provinces to visit their family during holidays.

we tried to help you figure out what was wrong. i even offered to examine it to diagnose the problem if you were close by.

people do the same thing to li ping, trash talking about his BMS when nobody even has a clue how they work, much less what could be wrong. ask them specific questions in order to diagnose and instead they just say they are not gonna worry because ping is sending a new one without question. ever wonder why he has to charge so much more now for stuff than he did originally?

there is no free lunch. michael did not manufacture that charger. he just found a source in china to supply you with one. you can expect the new one to break too, 92V is really really hard to push current at. it is just too bad you could not examine it so we coulda learned something outa this. or even helped you fix it. all imho.
Click to expand...
 
I have an evassemble pack. The dimensions quoted were different from reality, second hand wire was used, some of the crimps were very poor and the connector for the bms popped out of its own accord.

However, it was fine value for money, I could easily fix the problems myself and, at the heart of the matter, if the cells (headway) are ok and the bms functions as it should, I'm happy. I've checked those as much as I can and everything is functioning just fine. evassemble seem to specialise in headways and I still think of them as a very reliable option - far better than buying some 1-2C lifepo4 product based on pouches.

"Michael" (I'm sure there's been more than one of them because at times the grammar is spot on, but more recently...) gave me a bit of a runaround when the package was delayed but he was also incredibly helpful over skype to assist me in sourcing everything I needed for my first ebike

My conclusion: sure, there are problems to deal with in respect of these Gungdong Province firms (I've purchased from bmsbattery too), but the upfront price is so reasonable that it's worth the hassle. I don't believe that ebike conversions are for those who expect things to work straight off the boat. If you expect the need to do a little monitoring and DIY with everything you purchase (and, in my experience, it's exactly the same with US-sourced product), you won't be disappointed.
 
I just finished opening up my packs and boy am I glad I did. Once I cut open my second battery pack I gave a light tug on the wire connecting the 2 packs together and it pulled right out! Upon closer inspection instead of using 1 10ga wire they put 4 18ga wires together in a shrink tube! Why the heck would you do that?? Anyways I will be replacing all their crappy little wires with the proper setup. If anyone bought a pre-built pack from them I wouldn't even consider riding their bike until u tear down your packs abd build them right. Im not trying to hurt their business but its a matter of safety. Plus Im sure people would rather not push their bikes for 5 miles!
 
i think they are really not professional enough, by joining each cells by 18ga is very dangerous. any time can catch fire. Safety is the very important issue for everyone riding. If they are not Good, Beavinator should speak out freely and no worry which i think very important. ES a place to share some interesting knowledge and making ebike riding happily as well as safety issue on the batteries.. all the way.

kentlim
 
It is several 18awg wires though and not 1, it looks more like 16or 14 awg wire with 2 x wires per connection. But I will still be stripping mine and replacing the wire with 10AWG.
 
It took "Michael" 5 days to reply to my email. He tells me that he cannot send a replacement as he doesn't have one in stock. Not what his web site says..

I put Michael in quotes, as I no longer believe that there is actually a Michael at all. The last couple of emails from "him" were in diabolical English, previously "his" mails had been fairly good.

Bottom line is my charger is on it's way back, where it will probably be repaired. I mailed Michael and asked for a refund instead. give it 5 to eight days and I might get a reply.
 
Looks like I'll be taking evassemble of my page for references as to where to get battery packs.
It's a shame that the manufacturers there are so shady and that the resellers are also so shady.
If you are only going to offer a warranty of X then at least stand up to it. If you are offering the items without warranty, clearly state that too.
 
hi Gow864,

There are one guy say the same thing. maybe i think you are right, he is not the same person you are buying. Maybe micheal has already quit from evassemble. switching of jobs in China is common and very fast shift. so somebody is likely to take over his new post and start doing his business. most like the NEW " Micheal " has already said - start improving his business.

wires connection using thin wires can caused it to melt = by bad luck things can go very wrong. a surprise short circuit. my output wires to the controller has melt once. luckily it didn't short circuit. that is how come i think it may cause a small fire. i am using a 10awg or 8 awg copper wire. good no problem, no heat also.


kentlim
 
Last night I ordered a 36v 12ah pack and charger from EVAssemble.
I will be posting my review of the goods and service when they arrive.
Cheers,
Matt.P.
 
OK, so realising that ever getting my charger back from evarsemble I ordered one from BMS battery. sixteen days later the charger arrived. plugged in my battery and watched. the voltage steadily rose over about an hour settling on 87.6, it sat there for a while (approx 10 mins) then the charger turned off. Eager to try out my new ride at "off the charger voltages" i turned it on only to watch my CA slowly fade into darkness and absolutely no power at all turning the throttle produces nothing.

So anyone got any ideas? with the charger plugged in the bike will run. As soon as i unplug the charger the voltage drops away to nothing. I'm guessing I'll have to open this pack up, and I'm guessing the BMS has shit itself.

I WILL NEVER BUY FROM EVARSEMBLE AGAIN. I feel TOTALLY ripped off by them.
 
I'm going to do that tomorrow. This is SHIT! you pay good money and you get shit for it.

F@#K EVARSEMBLE, If you spent money with them and got what you paid for, then it was just dumb luck!
 
as with any battery pack problems, the first thing to do is measure the voltage on each cell at the BMS, then decide what needs to be done from there. i would recommend you not use it without the BMS until you know it is balanced. but measure first.
 
Gow864 said:
I'm going to do that tomorrow. This is SHIT! you pay good money and you get shit for it.

F@#K EVARSEMBLE, If you spent money with them and got what you paid for, then it was just dumb luck!
Click to expand...

With all due respect rushing to judgement has not made the situation better. Lessss suggested the BMS back on Nov. 9th and I think that was ignored. dnmum knows what he is talking about! You can get absolutely excellent technical guidance on the sphere. (It would take a very special vendor to give the same quality and honesty of technical support/advice you can find here.)

Your obviously PO'd right now so go out in the backyard and beat on something. When your done with that take some measurements, take some pictures and let the troubleshooting process begin. You'll learn something, we'll learn something. And you may be very happy in the end.

I bought a cheap kit off of ebay last year. Charger blew within a month. Posted some pictures. dnmun zeroed in on the problem in no time. Then he sent me a thermistor like the next day and everthing has been good since. :D And I'm sure someone else has since found that thread and been able to fix their own broken charger. :D :D

If the gurus on here determine that the entire build quality of your battery pack is crap then so be it. But it might be just one bad component in the BMS. :wink:
 
i think the total is now about 6 people who have fixed their chargers by replacing the burned out ICL. ron actually fixed two of the vpower chargers.

maybe it will be obvious what is wrong with his pack, but he will need his charger back once it is repaired too, or get another one.
 
I just opened the pack up. cell 24 is at .82v, when I plug the charger in it jumps to 10.42v?

I've got no idea from here. Prior to charging it the battery could be used, I charged it and now it's farked.

I'll post pics when I've trimmed them down.

I would ask Michael for a replacement, but hahahahahahahahaha, I'll probably have to send the cell back, that takes at least 10 days, then he'd have to make sure it was dead, then another 10 days to get the new one to me.

I'm getting close to giving up

EDIT: Should I disconnect this cell? I'm going to order another BMS and replacement cell from BMSBATTERY.
 
Sounds like the BMS killed the cell? OR the pack has not been left plugged in long enough to balance the pack. You discharge problem could actually be the bms doing it's job on detecting the bad cell and cutting of the pack. Plug it in leave it plugged in a goo 12 hrs keeping an eye on it and see if the BMS and charger kick in and cycle the pack until the low cell comes up. It's a tad lower than it should be though, a lot lower.
 
Gow864 said:
I just opened the pack up. cell 24 is at .82v, when I plug the charger in it jumps to 10.42v?

I've got no idea from here. Prior to charging it the battery could be used, I charged it and now it's farked.

I'll post pics when I've trimmed them down.

I would ask Michael for a replacement, but hahahahahahahahaha, I'll probably have to send the cell back, that takes at least 10 days, then he'd have to make sure it was dead, then another 10 days to get the new one to me.

I'm getting close to giving up

EDIT: Should I disconnect this cell? I'm going to order another BMS and replacement cell from BMSBATTERY.
Click to expand...


this is your 72V charger? do you have a list of the cell voltages and what they add up to, what is the voltage on the charger output? i suspect this may be why the charger was overloaded, if that was why it failed. do you have a single cell charger and an ammeter too so you can measure current?
 
Here are some pictures. dnmun: the charger is a new charger purchased from BMSBATTERY. it's output voltage (observed) is 87.6 Something I found whilst looking at the BMS was that the Power output negative lead was connected to C- on the BMS and and the charger negative was connected to the P- on the BMS. I'm guessing that this is wrong. 23 of the cells are between 3.3 and 3.4 and cell 24, the one connected to the power out positive is 0.0, I have disconnected this cell from the rest just in case???

I am going to order a new BMS and cell from BMSBATTERY. I will not deal with EVassemble.

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