Specifications
| Specification | Details |
|---|---|
| Manufacturer | Hero Eco - https://heroeco.com/ |
| Bike Web Site | https://www.f4wbikes.com |
| Model | FAST4WARD Peak |
| Model Year | 2012 |
| Price | $1,799 USD |
| Category | Mountain Bike / ATB | - |
| eBike Type | Pedelec | up to 20 mph |
| Frame type | male |
| Frame size | , |
| Weight | 46 lbs |
| Range | 37 miles * (60km) |
| Engine | |
| Engine Position | rear hub |
| Engine Power | 250 Watt |
| Assists until | 20 mph |
| Battery Type | Lithium-Ion |
| Battery Characteristics | 324.00 Wh / 9.00 Ah / 36.00 V |
| Range | 37 miles (60km) |
| Gearshift/Brakes | |
| Gearshift Type | derailleur |
| Gears | 8 |
| Gearshift Brand | Shimano Alivio |
| Brakes Type | V-Brake |
| Suspension | |
| Suspension front/rear | Yes / No |
| Tires | |
| Size | 26 x 1.75 |
Battery
Sony 36V 9Ah Lithium Ion 324 Watt Battery
10s4p 2.25Ah Lion
Capacity Test
| Capacity | Expected | Actual | Percentage |
|---|---|---|---|
| Ah | 9 Ah | 2.6 Ah | 29% |
| Wh | 324 Wh | 93 Wh | 29% |
Disassembly
New Battery
Configuration
10s4P
Layout
Batter Rebuild
New BMS
Max Housing Size - 100mmx65mm
Current BMS
Bluetooth BMS
aliexpress.com - C$23.63
JBD Smart BMS-SP17S005 is a software protection board scheme specially designed
for 10～17series lithium battery packs.The whole system adopts concave convex front-end
acquisition chip
+ Bluetooth MCU scheme, and some parameters can be flexibly adjusted through
the uppercomputer according to the needs of customers.
The Smart BMS Automatically Identify Lithium Battery Strings From 10S To 17S.
Size:102*65*12mm.
Applicable Battery Type: 3.2v Lifepo4 & 3.7v Li-ion Battery Pack.
Package Included:BMS with built-in BT*Balance Wires
Function Introduction
(1)BT-APP in Phone-xiaoxiangElectric App:http://www.jiabaida.com/appdown/index.html
Support Both IOS version and Android version, can monitor and change the parameters.
(2)PC Tool Software: https://jbdtools.oss-cn-beijing.aliyuncs.com/packfile/JBDTools.zip
(3)UART LCD Displayer-Can monitor parameters on LCD display.
Attention
(1)All smart bms support xiaoxiangElectric App IOS and Android version to convert li-ion and lifepo4 parameters.
(2)All smart bms has BT and UART function.
(3)Smart BMS accessories needs buy separately:https://www.aliexpress.com/item/3256804529002284.html
(4)All UART communication can be converted to Canbus communication if needed,
only need to buy a canbus module converter separately.
(5)APP Manual and BMS Specification:pls contact customer service.
Circuit
Initial Replacement BMS
Bluetooth BMS
Capacity Test
Capacity | Expected | Actual | Percentage |
|---|---|---|---|
| Ah | 9 Ah | 9.24 Ah | 103% |
| Wh | 324 Wh | 334 Wh | 103% |
Motor Controller
Specifications
| Specification | Value |
|---|---|
| Product Number | JDW41-2 |
| Voltage | 36V |
| Max Current | 15 A |
| Rated Current | 7 A |
| Low Voltage Protection | 31.5 V |
| Throttle Adjustment Voltage | 1.2 - 4.4 V |
| Width | 2 3/8" or 60.3 mm |
| Length | 3 1/2" or 88.9 mm |
| Height | 1 3/4" or 44.5 mm |
Pictures
Wiring
| Wire# | No. Wires | Wire Colors | Purpose |
|---|---|---|---|
| 0 | 3 | Green, Yellow, Blue | Motor |
| 1 | 3 | Red, Green, Yellow | HALL - Wheel Speed Sensor |
| 2 | 3 | Red, Blue, Black(GND) | PAS - Pedal Assist Sensor |
| 3 | 2 | White, Yellow | Brakes |
| 4 | 2 | White, Yellow | Brakes |
| 5 | 3 | Purple, Grey, Black(GND) | Peddle Assist Switch |
| 6 | 3 | Red(5v), Green, Black(GND) | Throttle |
| 7 | 2 | Orange, Brown | Voltage Monitor? - NOT Used |
| 8 | 1 cable - 5 wires? | Black | Display? - Not Used |
| 09 | 2 | Red, Black | Battery Power |
Internals
Wires Going to Display/Controller (No longer used)
| Wire# | Color | -> | Wire# | Color | Usage |
|---|---|---|---|---|---|
| 1 (HALL) | Green | 8 | Blue | Speed Display? | |
| 7 | Orange | 8 | Green | ? | |
| 7 | Brown | 8 | Yellow | ? | |
| BOARD | Red (36V) | 8 | Red | Power | |
| BOARD | Black (GND) | 8 | Black | Power |
Issues
Power Turns Off When Driving
Sometimes while driving the power turns off. Toggling the power switch fixes the issue and we can continue along.
Thoughts:
- Could be a loose connection that gets jiggled when hitting bumps.
Observations:
- Noticed that the ground connector at the base of the battery was not very tight. Compressed the connections to ensure that they connect better when attached to the bike.
- Performing capacity test to see if the battery is ok.
- Capacity test resulted with a battery capacity of 8.67Ah. Looks good.
Power Turns Off When Driving - A lot
The battery would turn off when pulling higher currents. If I was easy on the throttle, I could get it to stay on.
Testing the cells showed that they were within spec.
| Cell 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|
| 3.957 | 3.959 | 3.966 | 3.968 | 3.975 | 3.969 | 3.979 | 3.985 | 3.977 | 3.988 |
I decided to disassemble the battery and test every cell. They appear to be fine. Capacity tests results were good.
When disassembling the battery, I noticed a wire with exposed copper. I assumed I hit it with the razor blade when taking it apart but it may have pre-existed.
Ordered a new Smart BMS with Bluetooth which might help diagnose future issues.
See Bluetooth BMS.
References
| Reference | URL |
|---|---|
| F4W Peak 350W electric bike | https://www.f4wbikes.com/#!peak/cee5 |
| F4W (Fast4ward) Peak 350W Electric Bike Review | https://electricbikereport.com/f4w-fast4ward-peak-350w-electric-bike-review/ |
| Details | https://www.greenfinder-mobility.com/e-bikes/brand/fast4ward/#/product_preview/1375 |
| Review | https://www.youtube.com/watch?v=1bcUQ2ykW_M |
| How to install a Brushless DC Controller on Ebike: The missing manual | https://www.youtube.com/watch?v=PuwnFMHHtaE |
| Increase speed of ebike: Swagtron EB5 controller upgrade | https://www.youtube.com/watch?v=QbsPzjG-QpA |