Noob question thread! 2020_Summer

it gets very saggy from 36 to 34-35v and thats where it completely dies at idle with no way of turning it on without charging, from 42v to 36v it feels normal however

Are you discharging through a BMS?

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never opened the battery pack so cant confirm but i assume it has one?

… probably bypassed then @b264

Is this an mboards pack

nope, scrapped it from a pre built board

however it does get ~27km range on 80mm wheels so it cant be broken

So it’s almost certainly “discharge” and not “bypass”.

I would set the VESC hard cutoff slightly (0.5V?) above the lowest voltage you’ve measured from your pack with a multimeter. I’d set the soft cutoff maybe 1 or 2 volts above that.

So maybe these cutoffs

or bump up the hard cutoff to like 34.5V

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^^

I personally set my good cell battery packs to 32v final cutoff on 10s

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yeah ill do that but strangely the range seems pretty spot on so maybe these arr some funky ass chinese cells that only operate to 34 lol

@zZoKo the reason you probably shouldn’t do this is because it sounds like your BMS already has a hard cutoff above that.

Also coming from MBoards they may not be good cells.

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Well he said he scrapped it from something else but the same thing applies. I have only run a discharge bms on Lipo before so I’m not sure how they tend to react at low voltage but it does sound like the bms doing work here, maybe in combination with the cells being bad

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gonna get dem 20ah lipo bricks one day and cruise to infinity and beyond :airplane:

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I need everybody to look at my Gulf GT40 livery but I don’t have my own thread so I’m posting it here.

The frosted grip tape hides my paint crimes nicely.

Need to buy a sharp blade for my knife before I trim it tomorrow.

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What kind of frosted grip is it?

I tried one kind and it was the shittiest shit on the planet, then I tried MOB clear grip and it was so much better then whatever I used the first time, that I just continued to buy MOB, scared of getting anything like whatever the first kind was.

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Don’t know if it’s any good it’s just just what the local skate shop had.

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:grimacing:

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you guys confuse me…Vesc tools pre setting for 10s lion is like 31V final cutoff, no? Is that to low for the cells?

I would not set it that low personally, I like mine to start cutoff at 3.3v/c and end at 3.2. It just protects the cells a bit more

Besides once you get past 3.2 if feels like the dropoff is instant

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Do I want an 8mm round shaft or a 10mm D shaft on flipsky motors?

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There are many more pulleys available for shafts with keyways, and most gear drives demand an 8mm shaft. So go with the 8mm round one :+1:

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whats the biggest battery i can fit in a 330 long x 160 wide x 40mm tall box including bms? would getting a custom built one be necessary to maximize the used space?