M6 fender washers will likely be too wide. M5 is tops on what I can use on my eboosted enclosure.
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need a spintend switch
is this the right type to be used with?
I replaced a dudes stock esc with a stormcore 60d+ and swapped to a bypassed bms a week ago.
Dude says everything is going well but just messaged me last night saying his voltage is dropping a ton under any accel, even on the bench. He sent me this video:
Apologies that it is in percentages, I had him switch it to voltage but didn’t get another video.
I’ve verified that he has it set up as 13s and the correct capacity so I’m curious why it’s dropping so significantly.
I wired the bypass bms like this:
What’s really odd in that video above is that the battery sags a bunch when he takes it to about 25mph but then levels off while he held that speed.
Any thoughts or suggestions are appreciated. I don’t want this guy hitting low voltage cutoff out of nowhere.
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How big is the pack? He’s consuming a fair bit after all.
Is this how the discharge to the ESC is wired?
When I was hooking up a friend’s prebuilt pack from the factory I remember checking 3 things to determine the battery amp settings on a 13s4p
Cells (7x4=28)
Nickel strip width and thickness (38A)
Battery lead AWG (40A)
Ended up with only 30A
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Only a 13s4p which is what I’m keeping in the back of my mind. It’s the Ownboard Zeus so I believe the Tesla 3 cells which mooch rated for 10a continuous.
@jaykup that is exactly how. What brand / pack was it may I ask?
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In the video you can see that he’s drawing 30A before the notification pops up. So I think the voltage sag is expected; he should probably limit his battery current to 20A per side.
Strange that his consumption is so high on the bench though, I wonder if something is causing drag
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The bench part is confusing me too. I’ll check it out more today just to be safe.
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tight belt is usually main cause
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It was on two ebike batteries of different brands. I bypassed the BMS on them. They are definitely not built for high amps.
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The nickel tabs did feel pretty thin. I’ve never built a pack myself before but I thought pictures of packs here had a lot thicker tabs.
The rest of the pack looked decent to my eye.
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The 2x 14awg is great, but the nickel looks like 4x0.15x7mm? So probably ~60A there but hard to know without measuring
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I run Linux VESCTool on my Chromebook, it doesn’t have USB access though so I use it with BT and TCP
Edit: using crouton, not crostini
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I appreciate the feedback!
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Maybe running as root / adding your user to the correct permission groups would allow it to?
Also, can’t chromebooks run android apps? Maybe the mobile vesc tool app works
So would Spintend be considered the top pick in terms of ESC?
For higher voltages, yes. 14s is considered HV, so you need something like a ubox.
the mobile version works fine, but the mobile version ONLY lets you connect over BT and not USB/TCP or anything else, plus I just hate the mobile UI and prefer desktop VT.
I was so pleasantly surprised to find the full apk runs the desktop UI on my chromebook, but still isn’t able to access USB
Add: I have also never, even after 3.01 ever been able to make metr work as a BT for the VT app
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Ensure your phone is connected to the same wifi router as your computer.
If your phone is on the mobile network, it won’t work.
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Yeah everything is on my home WiFi, tried restarting BT service on both devices in various orders, tried the classic restarts and reboots and all.
Metr just doesn’t connect to VT directly no matter what. The only way I’ve found is via TCP
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