Electric dirt bike specifications often appear simple: one model claims 24 kW, another mentions 35 kW, and another lists 52 kW. It is tempting to arrange those numbers from smallest to largest and declare a winner.
That comparison can be misleading.
Power figures may describe rated output, production peak output, instantaneous peak output or a result recorded under controlled development conditions. They may also be measured at different points in the system. Without a common definition and test method, the largest number does not automatically identify the fastest, strongest or most capable motorcycle.
The current discussion around the Light Bee 2 and TRB Apex provides a useful real-world example.
The Published Numbers
The regional Light Bee 2 product page promotes 24 kW peak power. The same page also states that 35 kW peak output was recorded during controlled Surron R&D testing. It lists a 65 kg curb weight, a 78.54 V 45 Ah battery with 3.53 kWh of energy and a claimed maximum speed of 90 km/h.
Source: Surron New Zealand — Light Bee 2
TRB Apex uses a different specification format:
- 26 kW rated motor power
- 52 kW instantaneous peak motor power
- 72 V 45 Ah battery
- 3.24 kWh nominal battery energy
- 300 A RMS battery current
- 600 A peak battery current
- 800 A peak controller phase current
These figures describe different parts and operating conditions. A responsible comparison must explain those differences before drawing conclusions.
1. Rated Power
Rated power describes an output level assigned for operation under defined voltage, temperature, cooling and duty-cycle conditions. It is generally more useful than a peak figure when evaluating sustained workload, but it is not automatically a universal continuous-power guarantee.
The exact meaning still depends on the manufacturer's test procedure. A motor may carry one rated value while the complete vehicle is limited by the battery, controller, gearing or temperature-protection settings.
For the TRB Apex motor, 26 kW is identified as rated motor power. That does not mean the complete vehicle can deliver exactly 26 kW indefinitely under every ambient temperature and riding condition. Final system validation is still required.
2. Production Peak Power
Peak power usually describes the maximum output available for a limited duration in a production configuration. It may be constrained by software, battery current, controller current, motor temperature, traction or mechanical protection.
The Light Bee 2 regional page uses 24 kW as the promoted peak-power figure. The page describes it as the steady peak output of the production-oriented EVO-2 system.
Peak duration is important. A motorcycle that can maintain a lower peak for longer may behave differently from one that produces a higher output for a very short interval.
3. Instantaneous Peak Power
Instantaneous peak power describes a short-duration maximum rather than a sustained operating level. It can be useful for understanding the system's available headroom during events such as initial acceleration or short bursts of high load.
TRB identifies 52 kW as the Apex motor's instantaneous peak power. The word “instantaneous” should remain attached to the number in product literature, tables and advertisements. Removing it would change the meaning of the claim.
The figure should also not be converted into an acceleration, top-speed or wheel-torque claim without complete-vehicle testing.
4. Controlled R&D Peak Results
Development testing can explore the technical limits of a motor or powertrain under controlled conditions. Those results can be valuable engineering information, but they may not represent the standard customer configuration.
The Light Bee 2 page notes that 35 kW was recorded during controlled Surron R&D testing while the promoted production peak remains 24 kW. This is a good example of why context matters.
A controlled-test maximum may use different software limits, battery conditions, temperatures, instrumentation or test duration. It should not automatically be compared with a production specification or another manufacturer's instantaneous motor rating.
5. Where Is Power Measured?
Electric power can be described at several points:
- Battery electrical input — voltage multiplied by battery current.
- Controller electrical output — power delivered to the motor phases.
- Motor-shaft mechanical output — power after electrical and motor losses.
- Wheel output — power after gearbox, belt, chain and tire losses.
These values are not identical. Every conversion stage introduces losses, and test instruments may calculate averages over different time windows.
When a specification does not state the measurement point, the comparison should be treated cautiously.
6. Battery Power Sets a System Boundary
A motor cannot deliver useful vehicle output without sufficient battery power.
The simplified electrical relationship is:
Electrical power = voltage × currentHowever, real systems are more complicated. Battery voltage changes with state of charge and load. Current may be limited by the cells, BMS, controller, cables, connectors, contactor or temperature protection.
The TRB Apex battery is specified at 72 V 45 Ah, with 300 A RMS and 600 A peak current. Multiplying nominal voltage by peak current gives a theoretical electrical value, not a guaranteed motor-shaft or wheel output. Voltage sag, time limits, efficiency and protection settings must still be considered.
The Light Bee 2 regional page lists 78.54 V, 45 Ah and 3.53 kWh. It also discusses its battery's discharge capability and thermal behavior. Those details reinforce an important point: amp-hours describe charge capacity, not maximum power by themselves.
7. Controller Phase Current Is Not Battery Current
Another common error is treating phase current and battery current as the same quantity.
The TRB Apex E100 Pro controller lists:
- 250 A maximum input current
- 800 A peak output phase current
The controller can produce phase current higher than battery input current because it converts voltage and current according to motor speed, duty cycle and control strategy. This is especially relevant at lower motor speeds.
Therefore, “800 A controller” should be written as “800 A peak output phase current.” It should not be presented as an 800 A battery draw.
8. Power Alone Does Not Predict Acceleration
Acceleration depends on more than peak kilowatts. Important variables include:
- Complete-vehicle mass
- Rider mass
- Wheel torque
- Reduction ratio and gearing
- Tire grip and surface conditions
- Motor-speed range
- Controller calibration
- Battery state of charge
- Wheel-lift and traction limits
The Light Bee 2 page publishes acceleration figures and a curb weight for its regional configuration. TRB has not yet published confirmed Apex vehicle weight, standardized acceleration, wheel torque or top speed. Those missing values should be clearly marked rather than estimated.
Without them, it would be inaccurate to claim that the Apex accelerates faster solely because its instantaneous peak motor figure is higher.
9. Power Alone Does Not Predict Top Speed
Top speed depends heavily on motor maximum speed, field weakening, reduction ratio, wheel diameter, aerodynamic drag and software limits.
A high-torque gearing setup may produce strong low-speed response but a lower maximum speed. A taller ratio may increase theoretical speed while reducing wheel torque or increasing thermal load.
The TRB E100 Pro supports field-weakening control, but that feature should not be converted into a specific top-speed claim without final gearing and vehicle testing.
10. A Better Comparison Framework
Use the following checklist when comparing electric dirt bike power specifications:
| Question | Why it matters |
|---|---|
| Is the value rated, peak, instantaneous or experimental? | Defines the operating condition |
| How long can the output be maintained? | Separates short bursts from repeatable performance |
| Where is power measured? | Battery, controller, shaft and wheel values differ |
| What battery conditions apply? | Voltage, charge and temperature affect output |
| What current limit applies? | Battery and phase current are different |
| What is the complete-vehicle weight? | Strongly affects acceleration and handling |
| What are the gearing and motor-speed limits? | Affect wheel torque and top speed |
| What protection or derating is used? | Determines repeatability under heat and load |
| Are the figures from the same test method? | Required for a fair direct comparison |
Light Bee 2 and TRB Apex: What Can Be Said Fairly?
Based on currently available information:
- Light Bee 2 has a published regional production peak of 24 kW.
- Its regional page also reports a 35 kW result from controlled R&D testing.
- TRB Apex specifies 26 kW rated motor power.
- TRB Apex specifies 52 kW instantaneous peak motor power.
- These four figures do not use one identical operating definition.
- A direct claim about acceleration, speed or overall superiority would require standardized complete-vehicle testing.
What can be said is that both products reflect the industry's move toward higher-output lightweight electric off-road systems. They approach that market with different published power definitions, battery architectures and system strategies.
Transparent Specifications Build Better Products
Clear definitions help customers make better decisions and help engineering teams avoid unrealistic expectations. They also create more credible marketing.
TRB product material keeps “26 kW rated” and “52 kW instantaneous peak” separate. Battery current and controller phase current are also listed separately. This makes the specification longer, but it is more useful than presenting one maximum number without context.
To understand how the complete system works, read TRB Apex 52 kW: An Integrated Electric Off-Road Performance System.
If you are evaluating a motor, battery and controller combination for an electric off-road application, share your target voltage, vehicle mass, gearing, duty cycle and performance requirements with TRB. Our team can help assess an appropriate system configuration.
Light Bee and Surron are trademarks of their respective owners. TRB is not affiliated with or endorsed by Surron. Third-party specifications are based on publicly available regional product information accessed on August 19, 2026 and may change. No direct performance conclusion should be made without comparable test conditions.
中文参考稿：轻蜂 2 的 24 kW、35 kW 与 Apex 的 52 kW，应该怎么比较？
电动越野车参数看起来很简单：一款写 24 kW，一款提到 35 kW，另一款标注 52 kW。把数字从小到大排列并宣布谁更强，看似直观，实际上很容易产生误导。
不同数字可能分别代表额定功率、量产峰值、瞬时峰值或研发受控条件下记录的最大值，也可能在电池端、电机轴端或车轮端测量。口径和测试方法不一致时，最大数字并不能直接证明整车更快、更强或更适合越野。
目前公开的功率数字
轻蜂 2 区域产品页面主推 24 kW 峰值功率，同时注明 Surron 研发受控测试曾记录 35 kW 峰值输出。页面还公开 65 kg 整备质量、78.54 V 45 Ah / 3.53 kWh 电池和 90 km/h 最高速度。
来源：Surron New Zealand — Light Bee 2
TRB Apex 使用另一套表述：26 kW 额定电机功率和 52 kW 瞬时峰值电机功率。电池为 72 V 45 Ah / 3.24 kWh，确认的电池电流为 300 A RMS、600 A 峰值；E100 Pro 控制器最大输入电流为 250 A，峰值输出相电流为 800 A。
四种功率口径不能混为一谈
额定功率
额定功率是在规定电压、温度、冷却和工作周期条件下赋予的运行数值，通常比峰值更适合判断持续负载能力，但仍不代表整车能在任何环境下无限时间保持该输出。
量产峰值功率
量产峰值通常表示标准车辆配置在有限时间内可以调用的最高输出。其持续时间可能受到电池、控制器、电机温度、牵引力和软件保护限制。
瞬时峰值功率
瞬时峰值表示短时间最大值。TRB Apex 的 52 kW 必须完整写作“52 kW 瞬时峰值功率”，不能去掉“瞬时”二字，也不能直接换算为加速、最高速度或轮上扭矩。
研发受控测试峰值
研发测试可能探索动力系统在特定条件下的能力边界，但不一定代表客户拿到的标准配置。轻蜂 2 页面中的 35 kW 即明确标注为研发受控测试记录，而公开主推的量产峰值是 24 kW。
功率在哪里测量？
电动系统至少存在四个不同测量位置：
- 电池电气输入端。
- 控制器向电机输出端。
- 电机轴机械输出端。
- 经过减速机构和传动后的车轮端。
每个环节都有损耗，测试设备的采样时间和平均方式也可能不同。测量位置不明确时，应谨慎解读。
800 A 相电流不等于 800 A 电池电流
E100 Pro 的 250 A 最大输入电流和 800 A 峰值输出相电流描述的是两个不同位置。控制器会根据电机转速、占空比和控制策略转换电压与电流，因此低速时的相电流可以高于电池输入电流。
所以营销文案应写“800 A 峰值输出相电流”，而不是“800 A 电池电流”。
功率不能单独预测加速和最高速度
加速还受到整车重量、骑手重量、轮上扭矩、减速比、轮胎抓地力、电机转速范围、电池电量和控制器标定影响。最高速度则与电机最高转速、弱磁、齿比、轮径、风阻和软件限制密切相关。
轻蜂 2 页面公开了区域车型的整备质量和加速数据；TRB 目前没有公布 Apex 的确认整备质量、标准加速、轮上扭矩和最高速度，因此不能只凭 52 kW 瞬时峰值就宣称 Apex 加速更快。
更公平的比较方法
比较前应确认：
- 数值属于额定、峰值、瞬时还是实验条件？
- 可以维持多久？
- 测量点在哪里？
- 电量和温度条件是什么？
- 电池电流与相电流限制分别是多少？
- 整车重量、齿比与电机转速是多少？
- 是否采用相同测试方法？
基于当前公开信息，可以确认轻蜂 2 区域页面主推 24 kW 峰值，并披露研发受控测试 35 kW；TRB Apex 标注 26 kW 额定功率与 52 kW 瞬时峰值功率。这些数字的运行定义并不完全相同，直接推导谁的加速、速度或综合性能更好并不严谨。
透明的参数口径比单纯放大数字更能建立客户信任。TRB 将额定功率、瞬时峰值、电池电流与控制器相电流分别列示，目的就是让客户更准确地理解完整动力系统。
如果你正在评估电动越野车的电机、电池和控制器组合，可以向 TRB 提供目标电压、整车重量、传动比、工作周期和性能需求，我们将协助评估适合的系统配置。
Light Bee 与 Surron 是其各自权利人的商标。TRB 与 Surron 不存在关联或授权关系。本文第三方参数来自 2026 年 8 月 19 日可访问的区域公开产品信息，可能发生变化；没有统一测试条件时，不应得出直接性能结论。
