sn0wchyld said:Your controller may get a little hotter stepping down to 30% of OCV than it would with a lower pack voltage (ie stepping down to 60% OCV - but these losses are minimal anyway. This is also the key point - your controller is stepping down the voltage from your pack to your motor in order to control the phase currents in the motor... so be it 60v or 100v or any other V... the motor only ever 'sees' what the controller wants it to 'see'.
it sounds like your mis-using the motor sim - use the same motor, same controller with the same phase current limit and adjust the 100v pack so it matches the speed/power draw of the 60V pack - and you'll find it has the same (or near enough) efficiency + power use, same hill climb ability and thus same heat generated.
Merlin said:if you creep up a hill with a 100v surron at 10-15mph/5kw its probalby 2500w heat you generate in losses. dont wonder when your stock surron guy tops the hill with half the temperature.
efMX Trials Electric Freeride said:
efMX Trials Electric Freeride said:
macribs said:Well from what I know from riding snowbikes 450cc and an older 500cc 2st power is everything and it ain't real fun before you strap on that nitro bottle, I mean a snowbike need as much power as possible to feel like a mx on snow. Stock sur ron motor and battery.....not much fun to ride I bet. Maybe a fun garage project but I bet it is horrible to ride in the deep stuff.
motomoto said:2 Grand. Not too bad.
https://www.timbersled.com/en-us/snow-bikes/st-93-ripper/
efMX Trials Electric Freeride said:the rear track is designed for pit bikes (with a similar power to surrron) .. of course it's no comparison to 450cc.. still likely better than wheels for some winter snow fun
macribs said:You need the ski lift at the blip of the throttle, you really massive power to launch "kick off" from ledges, to get that mx feel.
I don't think grown men can have much fun on that thing.
efMX Trials Electric Freeride said:depends on location and expectations.
efMX Trials Electric Freeride said:so surrron snow bike would be a lot more fun than "no-bike"
motomoto said:The guy that made this video verified that he bought it from Luna. Eric is such a creative engineer. My 58 tooth is below.
3DTOPO said:macribs said:You need the ski lift at the blip of the throttle, you really massive power to launch "kick off" from ledges, to get that mx feel.
I don't think grown men can have much fun on that thing.
Why is having a "mx feel" a requirement for "grown men" to have fun? I have a blast with the Sur Ron in the snow now - it's completely different than mx or bike riding or skiing. It's an experience all of its own and I think its very fun.
By adding a ski to the front and a track to the back, it would allow me to float on top of the snow (compared to a single contact point of tires the surface area would magnitudes more). So it would be like what riding in the snow is for me now, but I suspect even more fun, and much more capable.
efMX Trials Electric Freeride said:so surrron snow bike would be a lot more fun than "no-bike"
Well said.
so surrron snow bike would be a lot more fun than "no-bike"
The team says that they managed to keep the weight “under 500 lbs fully loaded,” which is competitive with current options on the market, but while being equipped with a significant 15 kWh battery pack.
That battery pack powers a PMAC motor with 250 N.m. of torque and about 80 kW of power output, which is a lot of power for a machine that weighs less than 500 lbs.
It’s why they can achieve a scary 0 to 60 mph acceleration in just 3 seconds.
Funny we had this conversation two years ago, back on page 86,87 of the thread. I'd love to see that Sur-ron Timbersled Ripper riding in a video. Could be more fun than we think. I know my local motoshop has the older Ripper 93 version for $1k, which would be reasonable. That's only if I don't need to do a ton of custom work to get it to fit the Sur-ron. Seems like you'd have to with the chain on the other side, no foot brake and such.efMX Trials Electric Freeride said:58 mine.jpg (446.75 KiB) Viewed 194 times
Does the grin sim take the current ripple from high voltage into account or saturation? I see a drop in efficiency but wondering if it’s the esc or esc n motormadin88 said:sn0wchyld said:Your controller may get a little hotter stepping down to 30% of OCV than it would with a lower pack voltage (ie stepping down to 60% OCV - but these losses are minimal anyway. This is also the key point - your controller is stepping down the voltage from your pack to your motor in order to control the phase currents in the motor... so be it 60v or 100v or any other V... the motor only ever 'sees' what the controller wants it to 'see'.
it sounds like your mis-using the motor sim - use the same motor, same controller with the same phase current limit and adjust the 100v pack so it matches the speed/power draw of the 60V pack - and you'll find it has the same (or near enough) efficiency + power use, same hill climb ability and thus same heat generated.
Not only the controller will get hotter when stepping down from higher voltage, but also the motor. The reason is that with higher voltage there is more ripple current (current spikes which make just heat everywhere in the windings and controller, but no torque).
I guess the motor sim doesn't include this in the calculations (correct me if i am wrong), as it also doesn't include saturation (max torque you get in real world), but it will be definitely a few percent overall less efficient.
I am too thinking that 24s is a bad idea, simply because it will push the top speed in Motorcylce territory which makes not much sense on a bike like this other than for drag races or short top runs (battery and motor is to small for this power).
Merlin said:if you creep up a hill with a 100v surron at 10-15mph/5kw its probalby 2500w heat you generate in losses. dont wonder when your stock surron guy tops the hill with half the temperature.
The difference probably won't be that big , but thats correct.