Ebike 36v Battery Pb 15A fuse to beConverted with battery litium36v 200Ah 20A service30AMax. I demand of is necessary to install limitatore A (15) V36

[Gastone]

In an electric bicycle already equipped with three 12 volt lead batteries each connected in series for a total of 36 volts and a capacity of 5 Ah,: Is it possible to replace them with a single pack of 36 Volt lithium batteries with a capacity of 200 Ah and a current output of 15A normal and 30A peak.! I repeat, is it possible to replace them? If so, what precautions should I take to avoid burning out the bike's engine control unit?
Could you tell me on AliExpress a suitable current limiter for my question? Keep in mind that the engine of my bike. And the control unit are currently protected with a 15A fuse so I deduce that this is the value not to exceed: I am therefore looking for a current limiter to not exceed 15A, correct?

 

[Gastone]

Risposta di deepseek(IA):
That's right, if your bike's motor and control unit are protected by a **15A** fuse, it means that the system is designed to work with a maximum current of 15A. To avoid exceeding this value, you can install a **current limiter** or a **current controller** that prevents the battery from delivering more than 15A.

### What to look for on AliExpress:
On AliExpress, you can look for a **DC current limiter** or a **current controller** with the following specifications:
- **Input voltage**: compatible with 36V (make sure it supports at least 36V, but ideally a wider range, for example 20V-50V).
- **Maximum output current**: adjustable or fixed at **15A**.
- **Power**: make sure the device can handle the required power. For 36V and 15A, the power is \( P = V \times I = 36 \times 15 = 540W \). Look for a limiter that supports at least **600W** to have a safety margin.

### Examples of products on AliExpress:
1. **DC-DC Converter with Current Limitation**:
- Search for "DC-DC buck converter current limiter" or "DC-DC step-down converter with current limit".
- Example: a module like the **XL4015** or **XL4016** (adjustable up to 5A) or the **LM2596** (up to 3A). However, these do not support 15A, so you should look for more powerful models.

2. **DC Motor Current Controller**:
- Search for "DC motor speed controller" or "PWM DC controller".
- Example: a 36V and 15A PWM controller, like the **KY-009** or similar models. Make sure it is adjustable and allows you to set a current limit.

3. **Specific Current Limiters**:
- Search for "current limiter module 15A" or "DC current limiter 36V".
- Example: modules like the **DROK DC-DC Current Limiter** (available on AliExpress) that support voltages up to 36V and currents up to 20A, with manual adjustment of the current limit.

### AliExpress search link:
You can use these keywords to find the right product:
- ["36V 15A current limiter"](https://www.aliexpress.com)
- ["DC motor current controller 36V"](https://www.aliexpress.com)
- ["PWM DC controller 36V 15A"](https://www.aliexpress.com)

### Tips:
- **Check reviews**: Make sure the product has good reviews and is reliable.
- **Check the specifications**: Read the technical specifications carefully to make sure that the device supports 36V and 15A.
- **Safety margin**: Choose a device that supports a slightly higher current (for example 20A) to ensure greater durability and safety.
Is correct?
I will buy the correct limiter, can you suggest of is necessary?
Thanks

 

[lnanek]

The motor controller's function is essentially a current limiter. You input a throttle or PAS signal, it decides how much current to draw. A good controller will be programmable with a certain max battery amps to draw at full throttle. A cheap generic controller will generally have a fixed amount it draws, often on the label. This amount should always be less than the max amount your battery pack can sustain. The controller should also have a low voltage cut off so as to not run once the battery is depleted past a certain voltage.

A good lithium battery pack should have a BMS. The BMS, similarly, is programmed with a max discharge limit in the case of expensive ones or has a built in limit in the case of cheap generic ones. This limit should always be lower than the max discharge of the cells times the number of them in parallel.

A fuse is... kind of pointless. I guess you can add one just in case something gets shorted. The max amps of the fuse should be higher than any of the other numbers.

E.g.
15A max controller
30A max BMS
10A max cell times 5 in parallel in a e.g. 10s5p pack = 50A
60A fuse

 

[Gastone]

Thank you

 

[E-HP]

a single pack of 36 Volt lithium batteries with a capacity of 200 Ah and a current output of 15A normal and 30A peak.! I repeat, is it possible to replace them?

Depends on how solid your bike frame is and how much space you have.

200Ah would require a 57P pack, if using 18650 3500mAh cells. So, for 36V, that's a 10S57P pack, or 570 cells. An 18650 cell weighs 50 grams, or 28500 grams for the pack, or 63lbs of cells alone, vs maybe 12lbs for the 3 batteries you have now. If you have room, and your bike can handle 5 times the weight and you have ~$3000 for a battery, then yes.