#11
|
|||
|
|||
E Bikes
On 4/10/2011 4:01 PM, Phil H wrote:
On Sep 30, 4:31 pm, wrote: Do they or can they reverse the flow when going downhill to recharge the battery? Like the electric trains up and down the Blue Mountains putting power back into the grid? Regenerative braking is a fairly common feature on electric bike motor controllers, or it was last time I looked. However, I think it's more of a feel-good thing than a practical feature; the cumulative inefficiencies involved mean that of the energy that goes into getting the bike moving, only a very small proportion ends up back in the battery. -- Phil Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? |
Ads |
#12
|
|||
|
|||
E Bikes
Rob wrote:
On 4/10/2011 4:01 PM, Phil H wrote: On Sep 30, 4:31 pm, wrote: Do they or can they reverse the flow when going downhill to recharge the battery? Like the electric trains up and down the Blue Mountains putting power back into the grid? Regenerative braking is a fairly common feature on electric bike motor controllers, or it was last time I looked. However, I think it's more of a feel-good thing than a practical feature; the cumulative inefficiencies involved mean that of the energy that goes into getting the bike moving, only a very small proportion ends up back in the battery. -- Phil Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? Here we go again, you get nothing for nothing. |
#13
|
|||
|
|||
E Bikes
John Henderson wrote:
That 200W limit is Australia-wide (enshrined in the Australian Road Rules). When did that happen? |
#14
|
|||
|
|||
E Bikes
Fraser Johnston wrote:
On 22/09/11 1:45 PM, Zebee Johnstone wrote: As far as I know the conversion is "replace the wheel with the hub motor one, locate the battery somewhere, run the cables." I'm thinking illegal. Why? Is the motor power more than allowed in your state? |
#15
|
|||
|
|||
E Bikes
On Oct 4, 7:46*pm, Rob wrote:
Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. *Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? To paraphrase Homer Simpson: in this country we obey the laws of thermodynamics! You're describing perpetual motion. It wouldn't work. -- Phil |
#16
|
|||
|
|||
E Bikes
On 5/10/2011 9:29 AM, Phil H wrote:
On Oct 4, 7:46 pm, wrote: Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? To paraphrase Homer Simpson: in this country we obey the laws of thermodynamics! You're describing perpetual motion. It wouldn't work. -- Phil Maybe the word topping up isn't correct. I know you don't have perpetual motion. What I was suggesting was placing energy back into the battery so as to extend the range of the charge, even if it was only 10%. |
#17
|
|||
|
|||
E Bikes
"Rob" wrote in message ... On 5/10/2011 9:29 AM, Phil H wrote: On Oct 4, 7:46 pm, wrote: Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? To paraphrase Homer Simpson: in this country we obey the laws of thermodynamics! You're describing perpetual motion. It wouldn't work. -- Phil Maybe the word topping up isn't correct. I know you don't have perpetual motion. What I was suggesting was placing energy back into the battery so as to extend the range of the charge, even if it was only 10%. Good way to get fitter and lose a bit of weight. T. |
#18
|
|||
|
|||
E Bikes
Rob wrote:
On 5/10/2011 9:29 AM, Phil H wrote: On Oct 4, 7:46 pm, wrote: Well why can't there be a generator on the front hub feeding the battery - that would be topping it up all the time. Wonder how that would translate into horse power loss of efficiency of the rear motor to drive the generator? To paraphrase Homer Simpson: in this country we obey the laws of thermodynamics! You're describing perpetual motion. It wouldn't work. -- Phil Maybe the word topping up isn't correct. I know you don't have perpetual motion. What I was suggesting was placing energy back into the battery so as to extend the range of the charge, even if it was only 10%. Only if you put more in,like pedal harder. |
#19
|
|||
|
|||
E Bikes
terryc wrote:
John Henderson wrote: That 200W limit is Australia-wide (enshrined in the Australian Road Rules). When did that happen? Earlier, rather than later IIRC. The earliest copy I've got is 2008, but it was there before then. John |
#20
|
|||
|
|||
E Bikes
Rob wrote:
What I was suggesting was placing energy back into the battery so as to extend the range of the charge, even if it was only 10%. On your proposal, is the charging done only when the brakes are applied? If so, it'd require specialized brake levers with a switch. Output of hub generators is typically 3W - given losses, much closer than 1% of drive motor output than 10%, and only for the short time spent braking. If it's charging all the time, it would require extra rider effort to produce that extra 3W. Either that or it (and more to compensate for losses) will be drawn from the battery, reducing both short and long term battery life. John |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
do police stations still sell recovered bikes? 2nd hand bikes | Maurice Wibblington | UK | 11 | September 19th 06 09:23 AM |
Bikes and Things Bikes - I'm kind of Ignorant | FunkyRes | Techniques | 8 | September 14th 05 02:07 PM |
Dreadful bikes, awful bikes, triage and maintenance | Simon Brooke | UK | 14 | August 10th 05 04:14 PM |
A question - Girls' bikes and boys' bikes - Why the difference? | ShoeFly | General | 7 | April 21st 04 01:34 PM |
Cheap Bikes vs expensive bikes - what are the real differences? | The Real Slim Shady | UK | 8 | August 13th 03 08:30 PM |