Must be time for a photo! Here's how things currently stand:
My goals for this build were for a lightweight/discrete commuting bike that could assist me to increase my average speed. Is it lightweight? Total added weight was 7kg, so I hesitate to give myself a pass there, although it doesn't feel heavy when I ride it so perhaps it is just a pass. Discrete? Well it doesn't scream ebike to me, however that frame bag is hard to miss! In my neck of the woods a rack and panniers would be much more discrete as I see them everywhere, however that involves putting the full weight of this conversion on the rear wheel. So perhaps it is just a pass here to. Impact on my average speed? Well I can now ride up most of my hills at 30kph, and easily cruise at 40kph on the flat using about 300-400 watts, so definitely a pass there!
Current issue: is my controller going to overheat? Here's how things look:
So yes the controller is in a bag with little opportunity to shed heat. I note molybdenum has been successful running his controller in a bag:
molybdenum wrote: ↑
Mar 11, 2018 4:18 am
I hide my external controller in a small under-seat bag, which is a no-no but I'm only pulling 200-300W so it doesn't overheat even on the hottest days.
I do have a possible solution though: adding grommets to the sides of the bag inline with the controller, and an exit port at the back to create a wind tunnel affect when I'm riding to get some air moving past the controller. Something like three of these on each side of the controller, with a hole at the back to let the hot air out:
Realistically though it would not move a significant amount of air.
The alternate solution is to add a temperature sensor to side of the controller and just monitor the temperatures, dropping power if it ever overheats.
One like this could be put inside the bag which would sound an alarm if things started to overheat (for less than $10 bucks):
https://www.ebay.com/itm/Digital-Alarm- ... Sw2Ptap0P0
One like this could even be mounted on the handlebars to provide real-time monitoring:
https://www.ebay.com/itm/9Mini-Digital- ... SwHG9asPyZ
So my inclination is to just add a temperature monitoring probe, set an alarm, and throw it in the triangle bag. Thoughts?