Just wanted to share a few details on my first build:
- Scott Aspect MTB
- 3D printed 440mm diameter belt wheel, fixed to 16 spokes. No teeths, just friction tape
- NTM 4248mm 650kv outrunner w 20T GT2 timing pulley
- 10mm wide 1524mm GT2 belt
- 30:1 gear ratio
- 4S 16Ah Multistar LiPo pack
- 50A VESC
- Tensioner by rubber band loaded dual ball bearings
- Type of riding: Power supported daily commute.
So far I've done 6-7 short trips, and today I took the bike for work - 10km each way. It worked well, my average speed was are 25km hour +- 2km/h depending on wind. Recharged during work with 6004mAh, so consumption around 600mAh @ 4S per KM. Perhaps less for the return trip, as this had tailwind. This would translate into 200 watts of assist power. The motor temp is around 20*C above ambient, so electric efficiency would be at least 80%, I guess.
The bike does more or less what I hoped, perhaps it's more power hungry than I expected.
Is 200W to be expected for light/medium assist? I was perhaps expecting 100watts, but there are losses, ofc.
thx / vbr
- Scott Aspect MTB
- 3D printed 440mm diameter belt wheel, fixed to 16 spokes. No teeths, just friction tape
- NTM 4248mm 650kv outrunner w 20T GT2 timing pulley
- 10mm wide 1524mm GT2 belt
- 30:1 gear ratio
- 4S 16Ah Multistar LiPo pack
- 50A VESC
- Tensioner by rubber band loaded dual ball bearings
- Type of riding: Power supported daily commute.
So far I've done 6-7 short trips, and today I took the bike for work - 10km each way. It worked well, my average speed was are 25km hour +- 2km/h depending on wind. Recharged during work with 6004mAh, so consumption around 600mAh @ 4S per KM. Perhaps less for the return trip, as this had tailwind. This would translate into 200 watts of assist power. The motor temp is around 20*C above ambient, so electric efficiency would be at least 80%, I guess.
The bike does more or less what I hoped, perhaps it's more power hungry than I expected.
Is 200W to be expected for light/medium assist? I was perhaps expecting 100watts, but there are losses, ofc.
thx / vbr