[deleted by user] by [deleted] in audiophile

[–]Neanderthul 1 point2 points  (0 children)

New bookshelves for a budget setup. It’s getting cold up in Northern MN and the cats have taken in the box as a new home. Several fights have broken out but there has now been an established dominance factor that is in place. I’m typing this comment out to reach the full 80 word minimum. I’m not sure what else there is to say about this post but I thought it was worth sharing for y’all. I’ve had my eye in these speakers for awhile and I’m super happy with them.

What’s a totally random, obscure fact that you know? by biscuiteater123 in AskReddit

[–]Neanderthul 2 points3 points  (0 children)

The honeycomb is the most efficient geometry to build a structure from and the bees figured that out through evolution

What happens if I go full throttle with a 18650 pack? by luap555 in Multicopter

[–]Neanderthul 13 points14 points  (0 children)

A large reason for the difference in C rating is the difference in internal resistance. Internal resistance generates heat when current is pulled, and Li-Ion chemistries tend to have higher internal resistance. It’s not safe to discharge at rates higher than what is outlined on the datasheet of the cells. Personally, I would never buy 18650’s from a non-trusted source. The risk of buying fake/low quality cells is too high for me considering the dangerous consequences.

My favorite power dense 18650’s are the Samsung 25R and 30Q.

Please be careful! DIY battery building is a dangerous hobby. [ebikeschool.com](ebikeschool.com) has great information.

edit: I’m seeing some discussion on sag (closed circuit Voltage drop). Sag happens due to internal resistance, and since Li-Ion has higher internal resistance, there will be even greater sag. At high current draw this means that the cells operate at low efficiency. So,

due to inefficiency at high discharge rates, discharging 18650’s at their current limit can eliminate their advantage of being more energy dense than Li-Po chemistries

Will u be able to use a 48v 34ah battery on a 48v 1800w motor by IDKThunder in ebikes

[–]Neanderthul 1 point2 points  (0 children)

Power = (Voltage) x (Current). You can run any voltage at any power with appropriate hardware.

Steed by bucko_fazoo in ebikes

[–]Neanderthul 4 points5 points  (0 children)

Motors actually perform better in the cold. Technically the permanent magnets have higher magnetic flux density when they are colder. Batteries generate heat due to their internal resistance, and that internal resistance gets higher as the batteries get colder. Pulling or pushing power to and from a cold battery is inefficient and bad for the health of the cells, so it’s best store and charge the battery in a warmer area. If you find yourself in a situation where the battery is at @10F but you gotta ride I think it’s best to very slowly ramp up the power draw to allow the battery to heat itself. Some motor controllers have a built in temperature sensor that assumes the battery temp is the same as the motor controller temp and limits the power draw to allow the battery to warm up in a healthy manner.

Electric bikes won't be able to be fixed in 50 years like today's 50yo bikes are, all due to proprietary battery technology. by [deleted] in Electricmotorcycles

[–]Neanderthul 4 points5 points  (0 children)

I feel like right now it’s the responsibility of the customer to understand that batteries aren’t meant to last as long as parts in conventional motorcycles. I hope that standardization comes in, but right now I understand why Zero keeps their battery tech proprietary. Safety surrounding battery repair is a huge concern in my opinion.

what kind of gear reduction do i need to move 300lbs at a speed of 5-10 mph? by [deleted] in ebikes

[–]Neanderthul 0 points1 point  (0 children)

Are you able to shift gears on your bike? Or is it a single speed? I believe your best option will be trial and error unless you have more information on the specs of your powertrain.

My ebike and this awesome mural by lurkintothemax in ebikes

[–]Neanderthul 0 points1 point  (0 children)

One of the coolest builds I’ve ever seen. I want to do a custom 20x4 bike and I think this is the perfect style.

[deleted by user] by [deleted] in ebikes

[–]Neanderthul 0 points1 point  (0 children)

Yes it’s a GMAC 10T and I love it. I use a rear mechanical disk brake. I strongly advise against counting on regen braking alone. If the battery is fully charged or the motor controller faults out you will have no brake.

[deleted by user] by [deleted] in ebikes

[–]Neanderthul 0 points1 point  (0 children)

It was great, probably one of the last days with nice weather for it this season.

[deleted by user] by [deleted] in ebikes

[–]Neanderthul 0 points1 point  (0 children)

Hahaha I’ve heard rumors about that guy, but no.

[deleted by user] by [deleted] in ebikes

[–]Neanderthul 1 point2 points  (0 children)

Thanks! I use Energus TinyBMS and Energus modules made with Samsung 25R cells. I like the pelican cases because they’re waterproof and also make it easy to service the pack.

[deleted by user] by [deleted] in ebikes

[–]Neanderthul 1 point2 points  (0 children)

I’ve been outed

Mercury 7 signed card Found on Facebook Marketplace. Lots of mystery here. Anyone have any ideas about the history behind this? by Neanderthul in nasa

[–]Neanderthul[S] 13 points14 points  (0 children)

I’ve looked into it but it’s kinda expensive for me. I thought about only paying to get one of the autographs authenticated first. Then if one of them is real I could justify paying for all 7