EVOFORCE BIKE Build 1

[Evoforce]

This was my first e-bike 2009 And tho I still like it, it only does about 15-20 mph. My daughter likes riding it with me because I let her ride in front on the seat. This is my second e-bike project which is a build this time! New folding bike platform. Compatti bike. The welds could have been a little better from china and it had a blemish under the paint job and arrived with a defective front rim. They sent me a new rim and aside from all that it works well. View attachment 18 This is a mockup of where I intended to place my battery. View attachment 17 I bid for my battery on Ebay and got it for $290 including a 5 amp charger and bms. It is a LiFePo4 48 volt 20 Ah V-Power battery that I bought from cammy-cc. It came well packaged. I was very happy with the seller and all of the good contact. Even tho they are located in china they were easy to work with. I was able to pick which battery shape I wanted. I changed my mind about where I was going to mount the battery because I was anxious to get her on the road. In the end I don't think I saved myself much time.

I contact cemented the battery to the drawer of this box.

Then I reinforced the inside with wood strips for more support and for screwing in the outer case sides.attachment=0]P1010011.jpg[/attachment] Then I added the side cases which were also a different sized cd holders. Those were screwed into the inner support wood that I previously installed in the main box.View attachment 16View attachment 14 I added the controller and cycle analyst shunt to one side case and the bms, charger port, key switch and fuse to the other side case. If I had it all to do over i would have switched sides with the bms and the controller because when I ride I leave the controller case door partially open to keep it cool. This is on the left hand side next to traffic. This causes excitement from people thinking something is going to fall out. I am constantly getting " your case is open" by well meaning people who are alerting me. Maybe thats why I was paced by the cops one day also. When I am charging the battery I leave the bms side open. Still planning on adding a dc/dc converter for 12 volt someday. All attachments are easy to unplug for quick and easy removal of system off back rack.View attachment 6 Well I screwed up posting pictures somehow so some of them are not in order. I had to add a solid stainless steel seat post to keep the weight from bending it and causing my rear rack to rub my wheel. At first, I was concerned about all of the weight at the back of the bike but I got used to it. I would not recommend a woman ride with this much weight up high on a back rack. 30 pounds is what my rack box weighs. I put a Crystalyte (phoenix racer) 5303 hub motor kit on this bike and it goes a good 37 mph on the flat. I really enjoy this bike and am happy how nice it turned out. Notice my daughters tow trailer that I built for her years ago. She rides like a queen! Cheers...

 

[kentlim26]

hi evo,

i have also used that vpower battery 48v 20a (bought in jun 2009), it seem very good. i think have done my battery about 7000km+ i ride all type of speed. Full throttle or low speed. for vpower is try to to go all the way full speed, im not sure if this battery can last me another few more years. i can get 59v on a full charged. most of the time i ride 3/4 throttle speed or 30km/h - 45km/h. im trying to bid one more pack battery from vpower,, but i couldn't bid the price i will like. so finally i purchased from bmsbattery.com. this will be my 2nd pack lifepo4 pack 48v 12a only.

that pack of 48v 20hr, weight is 13.2kg

cheers. nice build ebike

kentlim

 

[dnmun]

jim brought by a 20Ah 48V pouch pack/duct tape battery and i could tell that the problem on each end of the pack was associated with high self discharge rates.

examination exposed that the mylar on the surface of the outside wall of the end pouch had gas inside, not vacuum.

got me thinking that the way people assemble the thundersky with the end plates to clamp them might also be of advantage with the pouch assemblies like this.

so looking at how you built the box got me thinking.

imagine on each end of your box, you had a plate that would push against the outside of the end pouch with even force spread over the entire surface of the mylar.

then consider how it could be released to remove the pack from the box.

1. assume a plate that fit the face of the mylar, and between the plate and the end of the box insert a few party balloons. or a few small bladders of some sort inflated by spray foam?

2. maybe just use a plastic sandwich bag, squirt in a little foam and zip it up fast.

 

[Evoforce]

Hi dnmun, how have you been? That thermister you sent me is still going strong. Thanks again! That 50 volt 1000uF cap that I temporarily put in the charger, that I bought from Frys Electronics is still working, so I have not changed it out yet for the 63 volt one that I got from Mouser. Cammy-cc sent me a new charger so I have it sitting as a spare. Hope things are well for you. Hmmm... why not cut some 1/4" thick pieces of plastic that fit each side and plastic band all the sides to each other with a bander.

 

[kentlim26]

i got my test on the vpower battery. this pack of lifepo4 48v 20hr can gives you only 710.3watts. today i got a test... run alot to many places.. my total range i got is 95.22km (total). i have stop and go many times, shops or food court.. it was of off day for that day.710.3watts = 14.79hr of current true density of the vpower.i have run this battery for 2days then i am able to do 95km.

kentlim

 

[Evoforce]

Mine goes to 16.9 before BMS cutoff and I get close to 61 volts on full charge.