Noob question thread! 2020_Summer

1 Like

This is how I had it before
Edit: I just solved my own dumbass question :joy: I followed @mutantbass charge only wiring guide :man_facepalming:


Where is this wire at the bottom with the arrow pointing at it?

df7a4dc5097b2a2f4d83cfbb10379e2d166ec4dd

So I got the negative wire of the charge port connected to the C- and the positive wire connected to the fuse that leads to the positive wire of the harness, where does the B- wire connect to, or that goes to the negative wire of the harness

It’s the same connection as B0 (if that BMS has B0) which is battery negative. (B-)

Otherwise, you are forcing the entire charge current through the tiny balance wire and the JST connector. If the BMS even has a B0.

Let me see if the BMS has a -B, what happens if it doesn’t?

Then your charge current is limited to the 1A or so the JST connector can handle.

How many pins are on the balance connector?

I’ve never seen a BMS without a B-.

Some don’t have B0 though.

1 Like

Yup I got a B-, that goes to negative wire of the harness right

Absolutely; the battery will charge through that connection.

1 Like

Alright perfect, so I just need the B- soldered and that’s all for the charge only I got spare 18awg lying around from when I did the charge port, just need to get more solder

If the BMS has a B0 then it’s only used for charging.

If the BMS doesn’t have a B0 then it’s also used for balancing and to turn on the BMS itself.

One more than number of P-packs = has a B0
Same as number of P-packs = hasn’t a B0

Assuming a “bypass / charge-only” configuration

1 Like

I’m considering taking my busted tbdd’s, bolting them to a table, and using them as a sanding station. But im kinda stupid, so, there’s that. How would I go about doing that in a cheap, and preferably uncomplicated way? Can I even run them off of a wallplug? If I don’t care about variable speed, could I run them with a simple on off switch, instead of an esc? Is this even worth the effort?

You can’t, but you could use a really cheap ESC like an old VESC 4.12

You’d still need a transformer, some diodes, and a capacitor to step down the wall voltage to a DC value like 40 volts ish. Or a battery and a charger, preferably keeping it around 50% SOC

Yeah I kinda figured xD
If I buy an esc it’s goin in a board, so I probably will not pursue this route.

You could use a super-cheap non-esk8 ESC (like one for RC planes). No bells and whistles, no extra features, just apply power and throttle signal, and it spins. You can get a “RC servo tester” for a few bucks that will generate the throttle signal for you.

If you don’t need them to run at super high speed, a hacked computer PSU will provide lots of current, but only at 12 volts. 24/36/48 volt power supplies can also be had, but usually not as cheap.

5 Likes

Hey guys, snow is almost gone here and I can’t wait to get back on the board.

I spotted a really good price for a second hand (apparently brand new) stormcore 60d+ and 2x 20k lipos on our craigslist equivalent. He sent me a few pics and everything looks good visually.

Any tips to make sure I avoid any (hidden) issues? I’m thinking about bringing a laptop to connect the 60d into the vesc software. I don’t have the necessary wiring to connect motors though. I know the 60d+ is regarded as one of the better vesc (I think?) I just want to make sure I’m not buying a DOA device.

Same thing for the lipos, I’ll make sure they are balanced and check the Internal resistance on the spot.

Thanks :canada: :wave:

1 Like

Check that it connects like you planned, and also do this

None of those should be low resistance

1 Like

If you have an android device, you can just use the vesc tool app. Stormcores have Bluetooth. Make sure he has the button and you can just plug in one of the lipos.

Buying lipos second hand is a bit more… sketchy. You have no way of knowing how many cycles are on them and how much they’ve been mistreated besides internal resistance.

2 Likes

If you have three test leads with crocodile clips on either end, you should be able to do a quick sensorless detection and spin test.

3 Likes

Anyone got any ideas, I’m still stuck on problem 1. VX2 remote not showing any battery, amps or speed but appears to be functioning correctly.

All standard setup on remote done correctly. Using on Stormcore 60d+.
S ttings on vesc tool were not correct as I had to switch control type from OFF to Current so very possible something missing in other app settings.

1 Like