"stokemonkey" my Tongxin?
- Thread starter kitchenman
- Start date
Umm ... but ... I just changed the gearing from 48T / 15T to 36T / 15T and I'm able now to get up Beech Hill! ... Isn't this because the motor is now able to spin more and perform better? ... When set to 48T / 15T I almost didn't make it! ...
Hi Off course it will climb better but your top speed must be slower by lowering the gearing you get more tourk
I was happy with my speed and torque on Friday but the battery didn't last ...
Hi kitchenman
40 mph no pedaling will EAT battery's like 10/15 minutes or less You will need at least 36 volt 20 AH to get anywhere if you slow down to 20MPH and put in some pedaling effort you will get more range
with our 48 volt 10 ah battery's if you ride throttle only at 30mph you will empty the battery in 30 minutes
BUT that's 15 miles
Frank
40 mph no pedaling will EAT battery's like 10/15 minutes or less You will need at least 36 volt 20 AH to get anywhere if you slow down to 20MPH and put in some pedaling effort you will get more range
with our 48 volt 10 ah battery's if you ride throttle only at 30mph you will empty the battery in 30 minutes
BUT that's 15 miles
Frank
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Frank, this is Cytronex "kit" that used to be on the Cannondale CX700. Battery is 36v 4ah. My mission is to use what I have and to see how it performs on my recumbent. I'm going to commute for another year on my recumbent and then compare the stats that I have. So far, so good. I think I just need to change the gearing slightly and then hopefully the battery will last like it used to.
This was supposed to be a short tour around my bike video but my preparation was poor and the result is worse! ... I know where I've gone wrong and the next video should be much better and shorter! ... One of the things I had hoped to cover was removing the motor. It really is very easy. step-1: dis-engage the chain, step-2 remove the power cable and finally step-3 lift the motor out of the "drop ins" ...
STREET_MACHINE/STOKE_MONKEY REMOVING THE MOTOR - YouTube
STREET_MACHINE/STOKE_MONKEY REMOVING THE MOTOR - YouTube
Or... as I did this morning .... dont press the assist/boost button so much! .... Made it all the way this morning using high speed mode with a very respectable 14.6 mph average and this was in wet conditions .. lots of leaves and mud on the road ... Very happy! ....
Peaks? .. can you put that another way! ..
Gearing: is now 36T / 15T so about 1:2 ratio (on the rhs I have a 14 speed Rohloff - To get up my steepist hill I am able to use 5th gear and high speed mode)
Rated rpm is 175. Its the 180watt motor. Its the standard 36 volt system that Cytronex supplied. Battery is 36 volt 4ah.
At the moment I am having to use the assist button to stop the assistance as the motor doesn't seem to be getting to that point when it is supposed to generate 36volt and hence stop assisting! ... (which is great if I only want to do 11 miles! ) ...
What 4ah battery (Cell type) are you using and with what controller rated / peak (max amp draw) amp?
I'm interested as it clearly works very well with the gearing and to be honest keeping the rpm's quite low you can change with your own gearing. The lower rpm would also mean less heat through the motor so again its a plus point.
Gearing a hub like this is a very good way of opening up exactly what you'd like for whatever terrain while still keeping a small motor and small effciency out of a light system.
Definetly would get the most from the power available.
I'm interested as it clearly works very well with the gearing and to be honest keeping the rpm's quite low you can change with your own gearing. The lower rpm would also mean less heat through the motor so again its a plus point.
Gearing a hub like this is a very good way of opening up exactly what you'd like for whatever terrain while still keeping a small motor and small effciency out of a light system.
Definetly would get the most from the power available.
THe cells are NI-MH. The charger has this on it if its any help ... 60/50 hz 1.8/1.0A ... OUTPUT: 36VDC/2.5A ... re: the controller ... I think its got some gen on a label .. I'll pop down to the bike shed later and check ....
The fact you get 11 miles out of a 4amp36v NI-HM is really good if you ask me.
Thats 13watt per mile. Which on the face of it doesn't sound alot but your probably pulling a high C rate out the batteries and therefore the actual capacity usually drops the more you pull from a cell.
I'm glad you got it all up and working though and now its just monkeying about with it to get exactly what you would like.
At your current setup on a 10amp 36v battery you'd get at least 27miles.
Thats 13watt per mile. Which on the face of it doesn't sound alot but your probably pulling a high C rate out the batteries and therefore the actual capacity usually drops the more you pull from a cell.
I'm glad you got it all up and working though and now its just monkeying about with it to get exactly what you would like.
At your current setup on a 10amp 36v battery you'd get at least 27miles.
Thanks .. Yes. I think that Cytronex are generally considered as having done well with their solution ... which is why I am still excited about what they are going to do next! ... The back of the controller has a label but not all the values are visable:
Rated Power: 250 Watt
Operating Voltage: 36 V
Voltage Protection: not visable.
Regulating Current: not visable.
Control Motor Speed at:not visable.
Had another learning experience this morning ... I cant show you the photo as I forgot my phone this morning (still no checklist!) .. but one of my chainwheels failed. One of the red plastic sides sheared off! I was alerted because I noticed the sound of the chain tapping on the forks and I stopped after 7 miles (half way). I had been pushing it so I suspect my chainline was not quite right and the stress on the chainwheel caused it to fail. Unfortunately I was not carrying a spare which I will obviously start doing and attempted to configure a single chainwheel but this didn't work because I could not get the tension right and the chain jumped of the sprocket causing a lock out which brought me down again! ... fortunately I was only doing 5mph and no damage was done to man or machine. I then removed the chain and completed the ride to work using manual power which surprisingly I managed quite easily. I conquered the remaining two hills without too much trouble. The bike must have been close to 30 kg as I was carrying both my batteries! ...
D
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Bad luck! I guess this is the burden you have to carry for being a pioneer. I hope you carry on so that we can all learn from your experiences.
Thanks. I really need to sort out the chainline. Come up with a proper method for checking if its right or not ...
Regarding the issue with the motor not generating 36volts. Its been suggested to me that as its not in a wheel it never will which I tend to think is probably true. Do you think?
This is the battery
My second ebike was an early S/H Cytronex, a great set up and I loved it. I found I got between 15-20 miles on one charge. These bikes are supposed to be pedalled a lot more though, which is probably why the battery lasts longer.
Although I am sure the batteries do last longer, the spec says the battery will only give you 250 charge cycles!
Regards
Jerry
My second ebike was an early S/H Cytronex, a great set up and I loved it. I found I got between 15-20 miles on one charge. These bikes are supposed to be pedalled a lot more though, which is probably why the battery lasts longer.
Although I am sure the batteries do last longer, the spec says the battery will only give you 250 charge cycles!
Regards
Jerry
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Yes. Thats the one Jerry. I'm getting to work (15.2 miles) in high speed mode with a bit of battery to spare.
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