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„Yeah, that's just 11S and a limited 15A controller... waiting for my 70A micro-controller on Friday to put it inside the bottom bracket.“
- Thread starter SSR
- Start date
Update on the stealth build: I did some real-world load testing today comparing standard "soft" cells vs. the new EVE 50PL cells, and the results are hilarious.
The test rig is currently running 11S on a temporary larger controller restricted to a 15A cutoff. Top speed on flat ground is a solid, real 47 km/h (29 mph) on GPS (ignore that 69 km/h spike in the screen recording, just GPS glitching over potholes lol).
The test results:
1. Standard Samsung cells: After pinning the throttle over 4 bridges, these things were literally too hot to hold in my hand. But here is the funny part – because of the massive voltage sag from the heat, the internal resistance dropped, and they actually stopped tripping the controller's overcurrent protection on takeoff. They simply couldn't sag hard enough to trigger the cut-off spikes anymore. Talk about a "thermal safety feature" by running in limp mode.
2. EVE 50PL cells: Absolute night and day difference. After the exact same run, they stayed completely ice-cold. No voltage sag, pure linear power delivery. They feed the motor with zero effort. You can see how they pull in the screen record.
The current setup requires me to pedal-start because this big temp controller has a crappy low-voltage cutoff algorithm from a dead stop. But the good news is... the new micro-controller is on its way for Friday.
It measures just 2.8 x 2 cm, but it packs 70A MOSFETs on the board. No software limits, it just pulls. And yes, the final plan is to slide this tiny beast directly INSIDE the bottom bracket shell / spindle area.
Once it's in, the entire high-amp drivetrain and brain will be 100% enclosed within the steel tubes. No wires, no external boxes, just cold EVE cells and a hidden 70A micro-brain. Friday is soldering day. Stay tuned.
