Heat wave and motor temps

[hillslayer@]

Did a 105 degree 36 mile ride on my bbso2 1500 watt direct drive hub combo. The hub does most the work but the mid drive was still getting a little hotter than l like . I really don't think a single motor rig would survive in these temps unless it is modded for cooling. I would think most geared hubs melt pretty fast unless they are running metal gears .

 

[neptronix]

Oh yeah, subtract easily 33% of the power rating of any motor in the middle of summer.. the ol' air cooled versus water cooled engine debate comes up..

And increase the battery's internal resistance 4x in the middle of winter ( i mean real winter, not what you experience in most parts of CA )

Adjust your build accordingly!

 

[Apartunis]

One of my coworkers rides a homebrew e-bike I made with a 36v battery scavenged from a rental scooter. In this heat the battery has to cool down a while before the BMS agrees to charge. It is not heating up from running hard. Mostly it is ambient heat plus sunshine.

 

[hillslayer@]

Oh yeah, subtract easily 33% of the power rating of any motor in the middle of summer.. the ol' air cooled versus water cooled engine debate comes up..

And increase the battery's internal resistance 4x in the middle of winter ( i mean real winter, not what you experience in most parts of CA )

Adjust your build accordingly!

I do a morning ride and use way less battery than the same ride in late afternoon. I am guessing if you drilled some nice size holes in the side covers it helps. I do ride some cooler days in the winter although never below freezing and notice a loss of range on the colder days.

 

[morningsun]

Did a 105 degree 36 mile ride on my bbso2 1500 watt direct drive hub combo. The hub does most the work but the mid drive was still getting a little hotter than l like . I really don't think a single motor rig would survive in these temps unless it is modded for cooling. I would think most geared hubs melt pretty fast unless they are running metal gears .

105F for 36 miles is a brutal test for any e-bike motor. Splitting load between two motors probably made a huge difference there. I'd definitely want temperature monitoring before pushing a single motor that hard.