bike builds

[buddy64]

Hello everyone,
I would like to think Endless-sphere and it's member's on my two bike builds, the first build was my wife's bike, a Huffy that had been returned and was on sale at
Wal Mart for $38.00, Excessories/Ebay, 48V/1000W rear wheel for $260.00. Three 4S Lipo batteries, 50.4V, fully charged. the price of the batteries for $80.00. Thunder 350W power supply cost of $60.00. Thunder charger 1220, 300W, 12S for the price of $100.00 assortment of wire connectors. The second bike build was a Mongoose 20" Fat Tire bike bought for my 8 yr old Grandson, same wheel hub, I had to put the motor in a 20' rim so I bought some 80 mm spokes for $55.00, same battery setup, now the Huffy has over 200 miles on it, the Beast as my Grandson calls it has close to 30 miles, I have the speed turned down to 16mph for him.
Now I was wondering if you could help me with these questions I have.
Question 1. Why is the 20" motor louder than the 26"? Same motor, same controller, same LCD screen, batteries ect.
2. Why is the Thunder charger saying I have a dead battery when I have it plugged into a 120V wall outlet, I have hooked up two 1156 12V bulbs to the power supply, this has seemed to help with the low battery problem when I am bulk charging or balance charging, it stops charging and but the power supply is putting out 15.50V?
3. Was does the top right hand numbers mean on the Thunder charger mean and what should it read?
4. Would like to put in a BMS system. any recommendations/USA supplier's?
5. Where is the best place to get a 48V/1000W controller?
6. I hooked up the two gray wires on these controller's, now when I brake, I notice the battery indicator on the LCD is going up, will this hurt the Lipo batteries?

 

[Nobuo]

nice builds!

there is no reason to be one of the motors noticeable louder than the other if both are identical with identical electronics. the reason would be related to the rim spokes pressure or maybe differences in the controller configuration (it depends of how much the sound differences are)

You should test both motors with no load and slow acceleration, if possible exchange controllers once, that will give all the essential information needed

 

[buddy64]

Nobuo,
Thanks for the compliment and I will try your suggestion and it's ironic I watched your video on your 20' bike build which gave me the ideas on my 20' bike build.
thanks.
Buddy

 

[Nobuo]

oh really? That's the best compliment I could receive

Did you get the right spokes for the 20" at first attempt? :wink:

I hope we can spot the noise issue

 

[buddy64]

Nobuo,
Yes, I got the right length spokes on the first attempt, 80mm, it was also the first time I ever laced a bike wheel, it actually took me 10 hrs to get and it true. At the 8th hr I thought the sledgehammer and few real hard bangs would fix it, I sit down and suddenly it came to me, take the screwdriver, grind each end off, make a long point in the middle, started at the valve core hole and starting tightening spoke nipples with a screwdriver with long point in the middle. When the point touched the spoke, the screwdriver would lift up out of the nipple slot and stopped turning. I then would grind some of the long point off the screwdriver. I would start at the valve core hole, start tightening and turning the wheel, this kept everything pretty well even, this helped to get started and kept it pretty true from the get go. So thanks, you said 80mm, I took my measurements, it was pretty close to 80, so I bought 35, 80mm spokes for $49.15 shipped. I only had $50.00 on my account and if I had bought 36, it would went over $50.00, so I made one. I took a long spoke out of the 26" electric bike wheel, cut it to 87mm, the best I remember, pinged a new head on it, bent it and put it in the well and it worked good. Tonight I was having fun with my daughter and granddaughter riding the two bikes that I never thought about doing any testing, it really isn't that bad of a noise but it is an electrical noise.
Buddy

 

[Nobuo]

haha, we all get once the same mad time the first time lacing, then things go smoother.

I choosed 80mm and had to cut a little the 4 ones that goes straight in my lacing pattern, maybe 78mm would be more precise in my case, it depends on the motor and rim.

Maybe if you could someday take a close video of both motors working with no loads from 0% to 100% throttle we can spot sure if is normal or not.

also some pics of the Thunder charger and we can spot the meaning of the numbers

 

[buddy64]

With no load on the wheel, they do sound the same, when I have the chance I will take a picture and post it of the thunder charger.
Thank you for the response.