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  1. C

    Greyp G12

    64V / 20 Ah / 1,3 kWh We have customers that exceed the rates range - we sometimes see 150 km or more range. We are limiting the battery usage to 14 Ah - so there is still 30% left when you hit 0% SoC. We do this to protect the battery and to enable a longer battery life. A software upgrade...
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    Greyp G12

    68-69 V while charging. All cells should be above 3,4V (minimum cell voltage will help you to know when that happens). The cells will settle-down after charging to 3,33 - 3,35V so 66,6 to 67V in total. But the BMS takes care of that - you don't have to look at the voltages. The State of...
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    Greyp G12

    Mentioning the word "scam" in context with our brand hardly deserves an answer, but I'll be polite. Greyborg was an after-work-garage project of Zvonimir before he started to work for Rimac Automobili. It was a frame kit. Zvonimir started to work in Rimac Automobili 4 years ago. Then we...
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    Greyp G12

    No, sorry, it is not available for sale as a stand-alone unit. It is custom developed for the G12 and we will not sell it separately. Btw. I'm super excited that we have our first bike on the ES forum! And I find it great that the owner modifies it and shares his experiences Will keep an eye...
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    Greyp G12

    No, charger is off-board. 10 Amps so it can charge it in 80 minutes. The display is really just that - a display. The bike is running without it if necessary. There is no "brains" inside the display. Everything is being measured and calculated by the on-board electronics and then just...
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    Greyp G12

    What do you want to know. I know a thing or two about it :)
  7. C

    2013 Li Battery Catastrophic Events - Summary Thread

    Very informative and good thread so I will share a bit of our experiences too. We had an accident in our battery-lab recently. We were cycling two 20S3P modules with A123 cells. This is a common thing we do all the time with a bench developed and produced by us in-house. The bench has a 500V...
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    Greyp eBikes

    Thanks guys! I'm glad you like it! Zvonimir (HAL) did a great job together with the rest of the team. Adriano - the same guy that designed the Concetp_One did the design for the G12. Matija, Ivan, Goran, Igor and Tomislav - the same guys that developed the electronics for the Concept_One...
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    CRODRIVER and the 2012 RIMAC... AMAZING WORK !!!

    Hi Luke Thanks, I'm glad you like our work. We used brushed motors a few years ago (in the green BMW, AKA e-M3) but we have completely switched to PM. The first Concept_One prototype already has the dual motors with integrated controllers. New AWD prototypes with improved motor systems are...
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    CRODRIVER and the 2012 RIMAC... AMAZING WORK !!!

    Thanks guys, I'm glad you like our project! Yeah, Hal is the head of mechanical engineering in our company and he's doing a great job (for now at least :lol: ). You'll have to wait a little bit for shredding tires until we finish the P2 (Prototype 2). For now we only have the P1 and don't...
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    A123 20AH cells source?

    My experience with cell_man cells: We had 300 (100s3p) of them in our car for almost one year. We developed and made our own BMS which monitored and displayed every cell separatley. This is the battery pack: ...it was modified over the time in a few evolutions. Now there are 107 cells...
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    A123 20AH cells source?

    4 times more. But I have no use of cells without tabs.
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    A123 20AH cells source?

    How much? My cells are on the way...
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    A123 20AH cells source?

    Yes, and still waiting...
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    Highest discharge battery? (or highest power density)

    Where is the best place to buy them in large quantities? And can you post a link to your tests? Thanks a lot
  16. C

    Highest discharge battery? (or highest power density)

    I want to build a very light and powerful racing battery pack. Enerland has nice batteries but they seem to be out of business and hobby king has only a few on stock. I need a lot of small packs for a big car-sized pack (3000+ Amp discharge). Any suggestions? Thanks!
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    Most powerful EV battery pack ever?

    Hi It did the job quite well http://www.youtube.com/watch?v=iOo1TnWKVCg And YES, we're building a more powerful and yet lighter battery pack Just a sneak preview:
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    Most powerful EV battery pack ever?

    EDIT: Sorry, double post...
  19. C

    12 kw rc motor

    You'll be driving the motor with IGBTs? Cool 8) 600 Amp?
  20. C

    12 kw rc motor

    I just purchased a new toy! ...but I really can't read the 70+ pages of this thread :mrgreen: What are the experiences with this motor? What controllers are you using? I don't care about cost effectiveness, whats the baddest controller for this motor out there?
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    Best (or most common) components for a e-bike?

    Thanks for the input guys! I know Hal in person, we're almost neighbors :mrgreen: but he's very busy so I don't want to bother him with such stuff. But I will call him tomorrow, maybe he has something he wants to get rid of. So there are no special preferred controllers...? I just have to...
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    Best (or most common) components for a e-bike?

    Hi guys. I'm into electric cars and I have made several. Now I also want to make a cool e-bike for myself. I need a little help with choosing the components since I'm no expert in this field. I guess that Headway cells are a good option for the battery pack. The pack and BMS won't be a problem...
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    Nissan Leaf uses A123 battery cells?!

    But how can it be that all pouch cells look the same?
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    Nissan Leaf uses A123 battery cells?!

    Take a look at this video: http://www.youtube.com/watch?v=WrNmplhx7ag&feature=related I'm using A123 cells that look exactly the same as the Leaf cells. That would mean that A123 is selling these cells for a extremely low price to Nissan... EDIT: The cell on the video has a label tat says...
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    Nissan Leaf battery pack

    Hehe, good idea :mrgreen: You really think that those batteries (I mean the cells only) are better than the one we have available (Headway and A123)? Maybe they are space saving but I doubt that they can give high currents...
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