Aetos Pro vs Max vs Ultra: Which Ventus V9600 Gen.2 Controller Is Right for Your Build?
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If you're upgrading your Sur-Ron, Talaria, E-Ride Pro, or similar light e-moto, the Ventus VTB Aetos V9600 Gen.2 lineup is one of the strongest controller options on the market. All three versions — Pro, Max, and Ultra — share the same advanced Gen.2 platform and deliver up to approximately 76kW peak power. The key differences come down to voltage range and phase current capability. Choosing the right one depends almost entirely on the battery system you run — or plan to run.
Here's a clear breakdown so you can pick the best match for your build.
What All Three Controllers Share
Before diving into the differences, it's worth understanding what every Aetos Gen.2 controller has in common:
- Up to ~76kW peak power output
- Advanced FOC (Field-Oriented Control) / sinusoidal vector control for smooth, precise torque delivery
- Full VTB mobile app tuning — throttle curves, torque maps, burst power, regen levels, ride modes, and more (iOS & Android)
- High-resolution color display with real-time power, temps, voltage, speed, and battery status
- IP67 waterproofing and improved thermal design over the previous generation
- Support for a wide range of motors and bikes (with the correct Version 1.7 / Gen.2 bike-specific harness)
- Future firmware features including wheelie assist, anti-rollover, G-force logging, and enhanced safety functions
The differences between the three are purposeful. As voltage capability increases, phase current is reduced to maintain reliability and thermal performance. Here's how that plays out in practice.
The Three Controllers at a Glance
| Controller | Phase Current | Voltage Range | Best For |
|---|---|---|---|
| Aetos Pro | 1,200A (tested to 1,600A) | 60–80V / 12s–22s | Standard 72V builds — most riders |
| Aetos Max | 960A | ~80–109V / 12s–26s | Higher-voltage builds with room to grow |
| Aetos Ultra | 760A | 100V+ / up to 32s (~135V nominal) | Extreme high-voltage specialist builds |
Aetos Pro — The Best Starting Point for Most Riders
The Pro delivers the highest phase current in the lineup at 1,200A (tested to 1,600A), making it the strongest choice for low-end torque and off-the-line acceleration. It's optimized for the 60–80V range, which covers the vast majority of Sur-Ron Light Bee, Ultra Bee, Talaria Sting, and E-Ride Pro builds running stock or mildly upgraded battery packs.
Choose the Aetos Pro if:
- You're running a standard 72V system (or plan to stay in the 60–80V range)
- You want the highest phase current for maximum low-end torque and acceleration
- Your build uses a stock or mildly upgraded battery
- You want the best balance of power, responsiveness, and value
The Pro is the most popular choice in the lineup — and for good reason. Its higher phase current delivers a stronger punch off the line and excellent throttle feel across the entire rev range.
Aetos Max — The Middle Ground for Growing Builds
The Max sits between the Pro and Ultra, offering 960A phase current with support for battery systems up to approximately 109V (26s). It's the right choice if you're already running — or planning to upgrade to — an 80–96V pack, and you want voltage headroom without jumping straight to the Ultra.
Choose the Aetos Max if:
- You currently run or plan to upgrade to an 80–96V battery system
- You want more voltage headroom while maintaining strong performance
- You're building a higher-power setup that may grow over time
The Max gives you room to increase voltage without immediately needing to replace the controller — a smart choice if your build is still evolving.
Aetos Ultra — The Specialist High-Voltage Option
The Ultra is built for extreme builds. With support for systems up to 32s (~135V nominal) and 760A phase current, it's designed to handle significantly higher voltages than the Pro or Max. Phase current is lower by design — at these voltage levels, the power math still works out, but the controller needs to be rated for the electrical stress of a very high-voltage system.
Choose the Aetos Ultra if:
- You're building an extreme high-voltage system (100V and above)
- You need maximum voltage capability (up to 32s / ~135V nominal)
- You're pairing it with very high-output motors and custom high-voltage batteries
The Ultra is the right tool for serious high-voltage builds — but overkill (and more expensive) for standard 72V systems. Don't buy it unless your battery plan genuinely calls for it.
Quick Decision Guide
- Staying on 72V (or under ~92V fully charged) for the foreseeable future → Aetos Pro
- Planning to move into the 80–96V range soon → Aetos Max
- Building a true high-voltage (100V+) machine → Aetos Ultra
Matching the controller's voltage rating as closely as possible to your battery's upper operating range generally produces the best combination of power, efficiency, and long-term reliability.
Important Notes Before You Buy
- A bike-specific Version 1.7 / Gen.2 wiring harness is required for all three controllers and is sold separately.
- Some stock motors — notably certain Talaria XXX and 79Bike models — are not compatible and require an aftermarket motor upgrade before installing any Aetos controller.
- Proper installation, motor calibration, and app setup are essential for safe and optimal performance.
- Always verify exact compatibility for your specific bike model, motor, and battery with the seller before ordering.
Final Recommendation
For the majority of riders, the Aetos Pro is the smartest starting point. It delivers the highest phase current in the lineup, works excellently with common 72V systems, and provides the strongest real-world acceleration and throttle response for the price.
If your battery plans are already heading higher in voltage, step up to the Max or Ultra now — so you don't have to replace the controller later.
Whichever version you choose, the Aetos Gen.2 platform gives you deep tunability through the VTB app. Throttle feel, power delivery, regen behavior — all of it is adjustable to match exactly how you want to ride.
Have questions about which controller fits your specific bike and battery setup? Reach out — we're happy to help you choose the right one.