The Baserunner Z9 packs the same field-oriented control as Grin’s Phaserunner into a flat enclosure that sits inside the base plate of common downtube battery cradles, so the controller disappears from the frame.
It is sized for smaller hub motors: 55A peak phase current, roughly 30–35A continuous, and up to 14S (58.8V) packs. The battery leads are bare and are soldered to the cradle’s existing terminals. Configuration needs Grin’s software and a USB-TTL cable.
Note: Grin states that since 2025 the regular Baserunner uses an overmolded case that is not fully waterproof and is meant to stay inside the battery cradle; a potted stand-alone version exists for external mounting.
Specifications
| Parameter | Value |
|---|
| Current limit | 55 A / 30 A |
| Control mode | Sine-wave FOC |
| Housing | Potted |
| Low-voltage cutoff | Programmable |
| Motor sensor | Hall / Hall-less |
| Communication | UART |
| Configuration | USB |
| Protections | Over-temperature |
Models & specifications
| Model | Housing | Dimensions | Voltage | Current limit | Weight |
|---|
| Baserunner Z9 V6 | Potted | 90 × 55 × 15 mm | 24 / 36 / 48 / 52 V | 55 A | 180 g |
| Baserunner Z9 Stand-Alone | Potted | 98 × 60 × 15 mm | 24 / 36 / 48 / 52 V | 55 A | 280 g |
Highlights
- Hidden install: Lives inside the battery base plate instead of on the frame.
- Small-motor sizing: 55A peak phase suits 250–500W nominal hub motors.
- V6 signal demux: Reads speed and temperature signals sent on one motor wire.
FAQ
Can I mount it outside the battery?
Grin recommends the potted Stand-Alone variant for external mounting; the regular unit is meant for inside the cradle.
What battery voltage can it take?
Up to 14S lithium (60V max input), i.e. 24–52V nominal.
Wholesale, quote-only. Tell us the quantity, battery voltage, motor model and connector standard you need and we will reply with a quotation.
