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BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

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Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#111

Post by dylan604 »

sudosysgen wrote: post #82
dylan604 wrote: post #70

Earlier quoted context omitted.

eBike batteries are as unique as all of the power tool ones so that they are all different. what's your approach to housing and connecting your DIY battery for your make/model? i just recently became an eBike owner as well, and a second battery pack is 1/3 the price of the bike.

I built my own ebike. I can basically make the battery pack into any shape I want. Right now I run 14s10p 18650s - it cost me 200$ to make and it has as much capacity as 3000$ worth of Bosch powerpacks. Secondary battery packs are so expensive because of DRM and lack of interoperability. I could make for 100$ a battery pack that Bosch sells for 900$. You're really not paying for the cells. Power tool batteries aren't…

I don't care what is on the inside of the battery itself if the shape of the battery doesn't fit what I want to use it. I'm pretty sure this is everyone's definition of unique battery per vendor.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#112

Post by m0zg »

grayhatter wrote: post #104
m0zg wrote: post #96

Earlier quoted context omitted.

Looked them up and for LiFePo4 batteries they seem to charge several times the eBay prices. What could they possibly be offering at that premium, given that it's almost certain they don't make the batteries themselves?

They're already top balanced grade A cells versus grade B cells. They're also the cells used in industrial mining, so they're able to tolerate vibration and movement. > Why buy something that might explode from a trustworthy business, when it's cheaper out the back of some dudes car.

IIRC one of the main advantages of LiFePo4 batteries is that they can't "explode" under the normal circumstances. And if they buy batteries in China anyway, then why not buy from China as well? I'd understand 20-30% premium, but not 200-300%.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#113

Post by __blockcipher__ »

brandonmenc wrote: post #92
balia wrote: post #12

Earlier quoted context omitted.

Is arbitrarily pointing out “fyi this is a CHINESE business” the new “fyi this is a JEWISH business”?

Well, BDS gets away with saying "fyi this is an ISRAELI business"

JFYI comments like these are very likely to trigger flame wars and the like

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#114

Post by timetopay »

fspeech wrote: post #105
LgWoodenBadger wrote: post #95

Earlier quoted context omitted.

Weren’t LiFePO4 the batteries that need to be charged in fireproof bags because they have a tendency to spontaneously combust? Those were the horror stories I read about back when I had some for my Walkera rc helicopter.

Wang Chuan-Fu, BYD's CEO, drinks battery fluid to prove a point https://www.autoblog.com/2009/04/14/wang-chuan-fu-byds-ceo-d...

uncharged battery fluid may be inert, but once you put all of that energy in there, the story changes drastically

that said, LiFePO4 is a pretty safe technology at this point

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#115

Post by dylan604 »

jacquesm wrote: post #107
dylan604 wrote: post #70

Earlier quoted context omitted.

eBike batteries are as unique as all of the power tool ones so that they are all different. what's your approach to housing and connecting your DIY battery for your make/model? i just recently became an eBike owner as well, and a second battery pack is 1/3 the price of the bike.

What drivetrain does your bike have? I have a ton of documentation on the Bosch system. And I'm working on an extended range pack (2000 Wh, the bike is a speed pedelec doing 30 mph).

Couldn't tell you. The website doesn't list that level of detail. It's a 750W motor. It took me 6 weeks after ordering before it shipped due to "global supply chain" blah blah excuses.

It is serving me quite nicely without those kinds of mods. I'm not looking to set any speed records. Just needed something to help me get up the damn hills when I have a load of stuff. It does that better than hoped, so I'm happy.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#116

Post by jacquesm »

dylan604 wrote: post #115
jacquesm wrote: post #107

Earlier quoted context omitted.

What drivetrain does your bike have? I have a ton of documentation on the Bosch system. And I'm working on an extended range pack (2000 Wh, the bike is a speed pedelec doing 30 mph).

Couldn't tell you. The website doesn't list that level of detail. It's a 750W motor. It took me 6 weeks after ordering before it shipped due to "global supply chain" blah blah excuses. It is serving me quite nicely without those kinds of mods. I'm not looking to set any speed records. Just needed something to help me get up the damn hills when I have a load of stuff. It does that better than hoped, so I'm happy.

Neat :) Bafang is one of the larger suppliers. Keep an eye out on the temperature of the FETs in your motor controller, that tends to be the weak point for more powerful motors, 750W is a lot of power for an e-bike, mine only has 350 but it is 'street legal' and insured, if I would hack that it would become a liability. Since I have an e-bike my car has hardly moved.

Do you have a link for your bike? Mine is a Riese & Mueller 'Charger', a 2016 model.

https://www.pedelecforum.de/forum/index.php?attachments/uk_2...

The battery pack is quite anemic (500 Wh), so I'm building a much larger one, I do 130 Km round trips with some regularity (twice per week) and it takes two of those fully charged to fully discharged; and then recharged at the destination which is effectively murdering them, hence the need for a larger battery. A single pack has about 35 Km range. I want to be able to do the trip one-way on 80% full to 20%, which I've worked out to about 1000 Wh plus some reserve. The pack will likely be 160 cells, which is pretty heavy for an e-bike, but the frame has enough room for this.

Currently figuring out how to hook it all up and how to fool the controller in the motor to believe that my oversized battery is a genuine Bosch product without letting out the magic smoke from the toy level balancing unit in the BMS.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#117

Post by jacquesm »

m0zg wrote: post #112
grayhatter wrote: post #104

Earlier quoted context omitted.

They're already top balanced grade A cells versus grade B cells. They're also the cells used in industrial mining, so they're able to tolerate vibration and movement. > Why buy something that might explode from a trustworthy business, when it's cheaper out the back of some dudes car.

IIRC one of the main advantages of LiFePo4 batteries is that they can't "explode" under the normal circumstances. And if they buy batteries in China anyway, then why not buy from China as well? I'd understand 20-30% premium, but not 200-300%.

Think 'hospital', certified power, military, off-shore (vessels, platforms, emergency power and so on).

For a system that is bullet proof and where there are very strict requirements it makes sense to spend that money, for your homebrew system it likely doesn't, but you can pick up their inverters for a good discount at the various surplus auction sites with some regularity and that's the best of both worlds: great quality at a reasonable price.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#118

Post by sudosysgen »

dylan604 wrote: post #111
sudosysgen wrote: post #82

Earlier quoted context omitted.

I built my own ebike. I can basically make the battery pack into any shape I want. Right now I run 14s10p 18650s - it cost me 200$ to make and it has as much capacity as 3000$ worth of Bosch powerpacks. Secondary battery packs are so expensive because of DRM and lack of interoperability. I could make for 100$ a battery pack that Bosch sells for 900$. You're really not paying for the cells. Power tool batteries aren't…

I don't care what is on the inside of the battery itself if the shape of the battery doesn't fit what I want to use it. I'm pretty sure this is everyone's definition of unique battery per vendor.

Well you should - the fact they're pretty much electrically identical means that you can confidently buy off-brand batteries if they have good cells and that adapters can be possible.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#119

Post by sudosysgen »

jacquesm wrote: post #107
dylan604 wrote: post #70

Earlier quoted context omitted.

eBike batteries are as unique as all of the power tool ones so that they are all different. what's your approach to housing and connecting your DIY battery for your make/model? i just recently became an eBike owner as well, and a second battery pack is 1/3 the price of the bike.

What drivetrain does your bike have? I have a ton of documentation on the Bosch system. And I'm working on an extended range pack (2000 Wh, the bike is a speed pedelec doing 30 mph).

I have KunTeng controller and disply, with a GS Motor hub drive, pushing 2.5kW peak right now with a 1.5kWh battery pack.

The motor itself is capable of 6kW+peak power with a bit of statorade, but my battery and controller aren't up to snuff

I'm personally pushing 60kph :) But it's pretty scary at those speeds even with the best tires I could find and pretty good disc brakes, so I'm generally at 20mph or under.

I'm planning a 4kWh battery eventually... but not yet.

It's a super budget build for now - a BTwin Rockrider 520 with a battery from salvaged modem packs and an overvolted KunTeng controller and a hub motor. It's super fun though and I've done over a 1000km on it which is very nice.

Re: BYD has reportedly received 10 GWh of orders from Tesla for LFP batteries

#120

Post by dylan604 »

jacquesm wrote: post #116
dylan604 wrote: post #115

Earlier quoted context omitted.

Couldn't tell you. The website doesn't list that level of detail. It's a 750W motor. It took me 6 weeks after ordering before it shipped due to "global supply chain" blah blah excuses. It is serving me quite nicely without those kinds of mods. I'm not looking to set any speed records. Just needed something to help me get up the damn hills when I have a load of stuff. It does that better than hoped, so I'm happy.

Neat :) Bafang is one of the larger suppliers. Keep an eye out on the temperature of the FETs in your motor controller, that tends to be the weak point for more powerful motors, 750W is a lot of power for an e-bike, mine only has 350 but it is 'street legal' and insured, if I would hack that it would become a liability. Since I have an e-bike my car has hardly moved. Do you have a link for your bike? Mine is a Riese…

Sorry, totally forgot to provide a link to it [0]. I bought a cargo version specifically to use as a total car replacement. It has a 300lb capacity, so that's the why of the big motor. I wish I had done it sooner. I've only had it a couple of weeks, but I've already used it for trips to the hardware store, grocery trips, firewood (i'm sure some people laughed at that), and all sorts of stuff I'd have never attempted on a pedal bike.

[0]https://www.radpowerbikes.com/products/radwagon-electric-car...

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