Jane Mo Posted September 18, 2016 Share Posted September 18, 2016 国外只卖1600wh,国内只卖1640wh 1600wh /80v is for overseas market 1640wh/67.2v is for domestic market Link to comment Share on other sites More sharing options...
ElectricWheelEric Posted September 18, 2016 Share Posted September 18, 2016 What is the difference between the 1640wh and 1600wh model besides the voltage (80v/67.2v)? Link to comment Share on other sites More sharing options...
ElectricWheelEric Posted September 18, 2016 Share Posted September 18, 2016 Is the 1600wh 80v the high torque and the 1640wh 67.2v the high speed edition? Link to comment Share on other sites More sharing options...
Ivar Dijkstra Posted September 18, 2016 Share Posted September 18, 2016 If the engine is the same then it should have a higher speed with higher voltage. Also more output watts. And 25% stronger too. Link to comment Share on other sites More sharing options...
US69 Posted September 18, 2016 Share Posted September 18, 2016 so what now? 80 or 84 Volts??? 84 would match to 20seriell batteries...80 matches to nothing! if its the same motor and board have much fun in beta-testing gotways first 80/84Volts throw :-) Hallelulja to the Mosfets :-) Link to comment Share on other sites More sharing options...
OliverH Posted September 18, 2016 Share Posted September 18, 2016 1 hour ago, KingSong69 said: so what now? 80 or 84 Volts??? 84 would match to 20seriell batteries...80 matches to nothing! if its the same motor and board have much fun in beta-testing gotways first 80/84Volts throw :-) Hallelulja to the Mosfets :-) Massive reduction in Ampere. Link to comment Share on other sites More sharing options...
OliverH Posted September 18, 2016 Share Posted September 18, 2016 1 hour ago, KingSong69 said: so what now? 80 or 84 Volts??? 84 would match to 20seriell batteries...80 matches to nothing! Which voltage? Depends on that. 80/ 84 charging/ operational voltage? How much cells in series? What's the cell voltage? Link to comment Share on other sites More sharing options...
Donafello Posted September 18, 2016 Share Posted September 18, 2016 Now I'm totally confused. What would be the difference in selling one overseas and one domestically. Does anyone have a take on this? Link to comment Share on other sites More sharing options...
OliverH Posted September 18, 2016 Share Posted September 18, 2016 5 hours ago, Donafello said: Now I'm totally confused. What would be the difference in selling one overseas and one domestically. Does anyone have a take on this? DriveSaver weight and Ampere. Just a quick caculation based on the voltage... 84 V / 20 = 4.2 V per cell 79.8 V / 19 = 4.2 V per cell 67.2 V / 16 = 4.2 V per cell Link to comment Share on other sites More sharing options...
Donafello Posted September 18, 2016 Share Posted September 18, 2016 1 minute ago, OliverH said: DriveSaver weight and Ampere. Just a Quickborn caculation based on the voltage... 84 V / 20 = 4.2 V per cell 67.2 V / 16 = 4.2 V per cell So which unit would have more torque 2 minutes ago, OliverH said: DriveSaver weight and Ampere. Just a Quickborn caculation based on the voltage... 84 V / 20 = 4.2 V per cell 79.8 V / 19 = 4.2 V per cell 67.2 V / 16 = 4.2 V per cell What does this mean for a buyer looking into getting one of the two units? Link to comment Share on other sites More sharing options...
Donafello Posted September 18, 2016 Share Posted September 18, 2016 Also this would be what Lin told me a couple weeks ago that the 1600wh is only for overseas market. But my question is why make a different unit for 2 different markets Link to comment Share on other sites More sharing options...
Cloud Posted September 18, 2016 Share Posted September 18, 2016 My understanding its 84v , not 80 gotways's communication creates a lot of confusion, does anyone have more info on the differences between these two versions, and how a stronger torque is achieved in the 1640wh 67v version? Is the max speed still 40 kmh? Link to comment Share on other sites More sharing options...
esaj Posted September 18, 2016 Share Posted September 18, 2016 3 minutes ago, Cloud said: My understanding its 84v , not 80 gotways's communication creates a lot of confusion, does anyone have more info on the differences between these two versions, and how a stronger torque is achieved in the 1640wh 67v version? Is the max speed still 40 kmh? I'm guessing they're "rounding" to nearest tens of volts and meant 84V (max)... sales/customer service personnel are not (necessarily) technical people, so they could get the details wrong at times. Link to comment Share on other sites More sharing options...
Donafello Posted September 18, 2016 Share Posted September 18, 2016 23 minutes ago, esaj said: I'm guessing they're "rounding" to nearest tens of volts and meant 84V (max)... sales/customer service personnel are not (necessarily) technical people, so they could get the details wrong at times. My seller has. It shipped my unit and I'm sure it's possible to grab the 1640wh but I'm really curious about the differences of the 2 units! Link to comment Share on other sites More sharing options...
esaj Posted September 18, 2016 Share Posted September 18, 2016 12 minutes ago, Donafello said: My seller has. It shipped my unit and I'm sure it's possible to grab the 1640wh but I'm really curious about the differences of the 2 units! Probably no one else except the Gotway engineers can say for sure. Like others have stated, if the motor is the same in both models, then the 84V -version can attain higher top speeds. As (total) power is simply voltage times current, it will still need the SAME amount of current to produce the same power, ie. the torque and amperage values are same. I'd suspect the motors may be different (different torque / max speed at same voltage), but of course can't know for sure. Link to comment Share on other sites More sharing options...
Donafello Posted September 18, 2016 Share Posted September 18, 2016 So if it's the same motor then tourney should be the same just higher top speed? Link to comment Share on other sites More sharing options...
esaj Posted September 18, 2016 Share Posted September 18, 2016 5 minutes ago, Donafello said: So if it's the same motor then tourney should be the same just higher top speed? Pretty much. Of course there are limiting factors, something will "give up" if you just keep feeding higher and higher voltage to a motor... the windings may start "shooting through" (ie. the voltage is high enough for a breakdown to occur, and the current starts "jumping" through the insulations of the windings right next to each other). While the rotational speed of a motor is (pretty much) linear vs. the voltage, the output power and efficiency do not work in the same way: Overall, the dynamics of an electric motor are pretty complex, and the finer details go way over my head Link to comment Share on other sites More sharing options...
litewave Posted September 19, 2016 Share Posted September 19, 2016 30 minutes ago, esaj said: Pretty much. Of course there are limiting factors, something will "give up" if you just keep feeding higher and higher voltage to a motor... the windings may start "shooting through" (ie. the voltage is high enough for a breakdown to occur, and the current starts "jumping" through the insulations of the windings right next to each other). While the rotational speed of a motor is (pretty much) linear vs. the voltage, the output power and efficiency do not work in the same way: Overall, the dynamics of an electric motor are pretty complex, and the finer details go way over my head Nice graphs - are they from http://www.learnengineering.org ? Link to comment Share on other sites More sharing options...
OliverH Posted September 19, 2016 Share Posted September 19, 2016 5 hours ago, esaj said: Probably no one else except the Gotway engineers can say for sure. Like others have stated, if the motor is the same in both models, then the 84V -version can attain higher top speeds. As (total) power is simply voltage times current, it will still need the SAME amount of current to produce the same power, ie. the torque and amperage values are same. I'd suspect the motors may be different (different torque / max speed at same voltage), but of course can't know for sure. I can't follow your explanation. For my I understanding W = V x A https://en.m.wikipedia.org/wiki/Watt If I use this I need less A if I higher the voltage. Where's my mistake? Link to comment Share on other sites More sharing options...
Ivar Dijkstra Posted September 19, 2016 Share Posted September 19, 2016 From what I heard it's 20cell 84v! Could mean 25% more speed. And found websites that advertise with 70kmh max. And 170km range with the 84v version. Link to comment Share on other sites More sharing options...
OliverH Posted September 19, 2016 Share Posted September 19, 2016 If the only reason is to improve power and speed instead of keeping on the same power and reduce current it's very stupid. Remember what @Mistagear happened with his custom build at high speed Link to comment Share on other sites More sharing options...
Keith Posted September 19, 2016 Share Posted September 19, 2016 2 hours ago, OliverH said: I can't follow your explanation. For my I understanding W = V x A https://en.m.wikipedia.org/wiki/Watt If I use this I need less A if I higher the voltage. Where's my mistake? @OliverH, no mistake, looks like a slip of the keyboard by @esaj. A higher voltage does indeed mean the same power would require less current, thus a higher voltage can result in less heat loss and better efficiency. However, if the motor is not rewound for higher voltage then, in use, the higher voltage would permit higher current as well increasing the maximum power and heat losses, it would also permit higher RPM as the no load (I.e. Maximum RPM) would also increase. So power, torque and max speed would all increase but the current could become too high, I.e. Overheating more likely. The biggest problem, assuming the electronics are designed to take it, in simply raising the voltage is that the maximum power and maximum efficiency curves also move to a higher RPM meaning that current at slower speeds and balancing will be likely be higher, generating more heat and reducing efficiency. I.e. The wheel would have to be driven faster to gain any benefit. Really, a higher voltage needs also a rewind of the motor to lower the kV and optimise the setup. Link to comment Share on other sites More sharing options...
Ivar Dijkstra Posted September 19, 2016 Share Posted September 19, 2016 In Russia thay advertise the new 84v version as 70km/h! It's translated to English. Link to comment Share on other sites More sharing options...
Henrik Olsen Posted September 19, 2016 Share Posted September 19, 2016 @Ivar Dijkstra no way you are getting anywhere near 170km in range... I struggle to get beyond 40km, on the 820wh version at less than half speed. Link to comment Share on other sites More sharing options...
US69 Posted September 19, 2016 Share Posted September 19, 2016 Did somebody take into account that 1600wh would be about 20s6p? instead of 1640wh with 16s8p? so on this 1600wh 20a6p the complete drawn amperage would only been split to 6 parallel packages, instead of 8.... so that takes away the advantage of a general lower amperage on higher voltage! my 2 cents!!! example: board/Wheel needs 2400 watt! 1640wh/8parallel every pack at 67,2 volt has to generate 2400/8=300watt means 4,4amp 1600wh/6parralel everpack at 84 volt has to generate 2400/6=400watt means 4,76 amp So in the end you do not have any lower Amperage advantage at all!? 170Km??? Haha...if your weight is 35kg and you dont drive faster than 20kmh...then perhaps! Link to comment Share on other sites More sharing options...
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