Yedoo Scooter project Dual motor high Range

Updated:
This was my first dual-motor project—huge thanks to the Grin team for answering all my questions! I built these two e-scooters with high fun, portability (bike rack compatible), and long-range capabilities in mind. With dual 21700 battery packs, I achieved a tested range of about 80km** on steep hills roads, even at 2°C.

The front motor is a Grin All-Axle Slow Wind, powered by a Phase-runner V6, while the rear motor is an SAW20 with a 74mm axle width, capped at 400**watts for that extra push on the many steep hills in Quebec's northern regions. As shown in the picture, I can pull my kid in the Thule full-suspension trailer (about 50 pounds total) while maintaining a solid 18-22 km/h** up an 8% grade hill.

I've created a custom rack to hold both battery at the same time as seen in on of the photos, because carrying the extra battery in a backpack was really getting heavy on those long ride.

I’ve decided to hold off on adding solar for now, since the components I need aren’t available in Canada. I’ll revisit that option next summer.

In the meantime, once Grin has batteries back in stock, I plan to upgrade from 48 V to 72 V. The 48 V pack delivers plenty of power when fully charged, but below about 50 % its output falls off sharply—and with a heavy load (kid trailer in tow), big hills become impossible. The switch to 72 V isn’t about gaining top speed it’s simply to keep the power more consistent across the entire charge range. At least its the ideal.