meepmeepmayer

No, same exact cells. Gotway only use two types of cells: 2900mAh or 3500(3450)mAh to build all their battery packs. So 84V wheels come in multiples of 20*3.7V*2.9Ah = 215Wh (three of those are the standard "650Wh" pack) or 20*3.7V*3450mAh = 255Wh (three of those are the standard "800Wh" pack). 100V wheels come in multiples of 24*3.7V*3.45Ah = 306Wh (haven't seem them using 2900mAh cells in 100V wheels yet). - The big wheels (excluding Tesla and MCM5) have by design space for a 84V 3*20 cell 650Wh or 800Wh pack per side, that space also fits a 100V 2*24 cell pack but some space is unused, and 3*24 cells is too big for that space so they can't do that. But with irregular shape battery packs they can cram more capacity in the shells (which have enough unused space in principle). That's how way they build wheels with non-standard bigger battery capacity. It's crazy how GW design the wheels for the 84V battery pack size even though they know they're going to build 100V versions right away. Why don't they plan for both and have more options (like fitting 3x24 cells in one space) and bigger battery sizes possible by default? Yet another mystery

If these have bigger mosfets, worth it. But if they are simply glue-less but the same otherwise, why spend 200+ for a board when you can order some thermal pads and fix the error yourself?

The HY5510 mosfet is what's IN the TO-247 package (the black plastic casing of the mosfet). According to the data sheet when you google them ("HY5110 MOSFET"), they will come in TO-247. I don't know if they're the same mosfets used in the MSX, or even better. Some dealer website had the MSX mosfets rated at 200A continuous when I googled for that, the smaller HY3712P (in TO-220) of the Nikola are 170A according to the data sheet, but these are over 300A in comparison. (Numbers used only for relative comparison without meaning by themselves.) They might be even better

I'm simply considering the worst case. That would be: the "manufacturing issue" is them changing to new, TO-247 boards while still happily using glue. Of course I hope it's no glue + new board. Or at least no glue. Someone just needs to take their glue guns away altogether. And their silicone applicators while we're at it.

@Phil McLaughlin Fantastic!

No, same board as the old Tesla. See here in this Tesla2 thread: Looks like they use the same mosfets as the current 84V Nikola has. They aren't TO-247-level, but they're still pretty good. Even the original Tesla mosfets didn't cause problems.

Marty, your videos are really helping! Nikola with no glue, TO-247 with bigger mosfets, and 2100Wh is going to be sweeeeeeeeeeeeeeeet!

Big news! That means they either stopped using glue, or they change to TO-247s, or both!

There should be plenty of other EUC riders and possibly group rides in the Boston area. See if you can find them. In addition, u-stride (@Jediah Matthew here but didn't visit for some time) offers lessons. Check out his website and Youtube channel, he's a nice guy. All info can be found here: https://u-stride.com/about-2/ You can also read this post, it has a lot of helpful information. EUCing isn't that hard, so don't give up. But maybe some real-life guidance can help you learn faster.

Such a cool tour! Exactly the kind of riding I like. Just exploring and seeing where you end up. Anybody who questions the value of as-big-as-possible batteries needs to watch this. You trying to "break" into the prison was the highlight though

Interesting! Do they "only" have 6 currently?

Sweet Lord! I don't like the Monster, too sluggish and delayed for my liking, but sweet Lord! 2460Wh is 24s8p in comparison to 24s6p for the 1845Wh. They must have filled every available space with batteries.

So a better fix would be using new thermal pads? Where would one get those? @Chriull The idea was never to only use paste. Only in addition to the pads as these alone apparently cannot be reused. Whether that makes sense or not I don not know.

If I were in your position, I'd make a plan how to remove the glue, and find a nice non-conducting thermal paste. Then I'd disassemble the board, look if there's glue and remove that if there is, and put it back together with the original heat pad and the thermal paste on both sides of the heat pad. Then you should have a good board, right? How does one remove such glue cleanly without damaging the mosfet plastic? And ideas?

Never heard of this thing. Where did you get it? How much? Do you know the specs?

Speedy Feet statement From an email by Ian: Here's the article. Doesn't say much more than this. https://www.speedyfeet.co.uk/blogs/things-concerning-safety/gotway-nikola-control-boards-first-release Doesn't look like Gotway thinks this is anything but a one-off wheel failure instead of an issue that affects every wheel where the board was falsely assembled with hot glue between some mosfets and the heatsink, and neither we (nor they, probably) know how many and which wheels these are. They don't seem to understand that only because nothing much has happened yet, doesn't mean there is no big problem

Please make a lot of photos of the board from all directions and with all the details, should you open the wheel. I want to see those sweet mosfets confirmed

Good luck with that Though the 16X is going to be a perfect allrounder wheel, so you may have a relatively low urge to get more wheels. But lower than very high might still be too high to resist I recommend an mten3.

Wow, really elaborately made video!

Has this already been posted? EcoDrift: "Pre-series Kingsong KS-16X. First impressions" (Russian Original) EcoDrift: "Kingsong KS-16X. Disassembling. English version." (Russian Original)

I'm getting the impression that " The Great ________ Screw-Up of 20__! " will be something that we still have in 2030, from all manufacturers

We don't know. Gotway need to figure out how widespread this problem is. But there haven't been any failure reports from other 12-mosfet wheels like the MSX or Monster (the upgrade with the MSX board). So either the problem isn't there, or the stronger mosfets survived despite glue. Either way, no need to worry about existing non-Nikolas for now The MSX board has proven to be exceptionally strong and problem-free. Just look at @EUC GUY's car push test - the cabling died before the mosfets! So even if there is glue there, it's still no problem. But of course you don't want glue there, even if it does nothing.

Did he answer? If not: The 84V Nikola (for now) uses HY3712P mosfets in a TO-220 package. Source: EcoDrift in the comments of this video. If you look at the data sheet, you see 170A continuous/585A(?) max. For comparison, the MSX has mosfets (I don't know which) with around 200A cont/600A max. So the mosfet change is no big downgrade itself. But I guess the smaller package instead of TO-247 will have a huge influence on cooling. But given that wheels like the Tesla have survived with smaller mosfets than the Nikola (right?), I'm not convinced the mosfets itself are a problem. But of course it would be better if they just switched to the MSX setup for the 84V Nikola, which is apparently pretty much what they have done for the 100V Nikola. So if you could tell them that (again)

This isn't really a thermal paste issue. Just horribly botched production. The design itself seems fine (assuming the smaller mosfets are ok on their own). I'd be worried Gotway fix this fuck-up with another fuck-up (e.g. leaving out the thermal pads and shorting the mosfets with conductive thermal paste). Be 110% sure they understand the problem!

Gotway: "LOL we put glue on our mosfets!" Kingsong: "LOL see you in 2020!"