True on the loaded speed in relation to the tire size. Ill need to measure to check those as Im on hubba hubs which are a tad wider.
But bench speed, unloaded, should be around 46mph. Im getting 42mph in the vesc and davega. As far as I can understand tire size being off shouldn’t affect this at all.
EDIT Ive also posted in the Bioboards thread to get their take on it since Im running a BioX
Im guessing it your duty cycle limit start being at 85-90. This maybe how it acts on the bench, not 100% sure.
Try bumping that up, especially if its 85. I usually run 90-93 depending on setup.
Correct.
85% duty start
95% max
But doesn’t adding this stat into the calculator under efficiency take that into account?
Not really, efficiency setting is more for mechanical Ederlosses to the drivtrain and friction. DCLS is its own thing, it really softens the top end speed quite a bit.
I found 85 was too low.
It feels as if you get to 85 in a hurry and then it just crawls up to 95 and takes some time.
It’s a noticeable difference going to 90-92.
The calcs are just close estimates as there is variables at play. Motor kv isn’t always spot on and is almost normal to have up 10% deviations from spec. Also, the correct wheel size is another.
It’s also quite possible your motors are not the exact KV they claim to be, could be a few percent difference
KV could totally be off a bit too. BKB 6384s
Biggest question is whether or not the vesc/davega speed reading is correct. Neighbor has a radar gun, going to see what it says soon lol
I believe the RPM tracked by VESC/DAVEGA is accurate. I’m also confident the RPM to speed conversion in DAVEGA is correct. The calculation is pretty simple; it’s been well tested and there haven’t been any recent changes.
As others mentioned, the fact the max unloaded speed is lower than expected can simply be due to the duty cycle not being 100% and also the motor kv can be off.
The mismatch between GPS speed and DAVEGA speed can simply be because of the wheel diameter being off. You can always adjust your drive settings to compensate.
Duty cycle current limit start.
Just so it won’t cause confusion
Also (in general):
Duty cycle ≠ duty cycle current limit start
Right on. Thanks. I just wanted to see if the readout was fairly accurate or if I missed something. Not concerned with it being a little lower than estimated before the build, I expected that a bit. Appreciate it. Love your products.
Need some help getting back the BMS screen!! Normally, I could scroll thru all the screens but, after my riding session today, I can’t view the BMS screen anymore. Is it a settings things?
Edit: Powered my board on and this time the BMS screen came up. Previously, it seems like it’s not getting found…so no BMS screen. Has anyone else had this issue! Could this be from a warm battery after a ride!
Which BMS? If LLT, it could simply be that BT connection failed, which may happen ocassionally. Power cycling should fix it.
It’s LLT and Power cycling did fix it. Good to know for next time. Thanks Jan.
Having the LLT issue again. No BMS screen. Tried cycling over 7 times and nothing. Is their any trouble shooting I can do or only power cycling can help.
It may be that the BT connection is not ideal. The only idea that comes in mind to fix that is to bring the LLT BT module closer to the DAVEGA. You could potentially extend the cable between the LLT and the BT module.
Nevertheless, DAVEGA was never designed for use with the LLT. It was added as an experimental firmware update and it should be treated as a fact of life that it does not always work great.
BMSes that are guaranteed to work correctly with DAVEGA include ones that connect over CAN bus – DieBieMS, Ennoid BMS, FlexiBMS.
My Davega X is acting up and don’t know why. During my ride it totally shut off and now I only get a white screen when powered.
I’ve tried multiple cables, changed connectors, holding down up and mid on boot. I’m stuck and don’t know how to go about it.
Sounds like a hardware failure. Please take the electronics out of the enclosure and check for any signs of damage. Which hardware version is that (it’s written on the PCB)? How long have you been using it? Any chance water/moisture got in?
Ver. 1.2.1
All the electronics look okay. No sign of water damage or corrosion. It’s a fairly new unit. Had it connected to a usplit but whatever happened killed that as well.
Got in for christmas and hasn’t seen much use
Sounds like something bad happened. Did it just come out of nowhere or are you aware of any changes that might have caused it?
Either way, it’s likely the DAVEGA is dead. You’ll need replacement electronics. I’ll PM you and we’ll figure something out.
Got your PM and responded.
For some reason my usplit is heating up you can’t touch it which I believe caused solder to reflow leading to a short. The Davega was just there to take part of the voltage spike. Now the Davega starts to heat up a ton while plugged in
I’m going to try it on a different ESC just to make sure. Happened out of the blue. Looked down to check speed and it was fine, next time I looked down it shut off and will only boot to a white screen.