Electric Skateboard Vlog - 3. Anti-Spark
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- Опубліковано 18 вер 2017
- XT90 Anti-Spark? What is this Antispark you speak of? Watch this video for a quick note on the Anti Spark for Electric Skateboards.
Also check out my How to Build an Electric Skateboard video between 7.26 and 8.18 for more information.
FYI the Anti-Spark provides an initial 0.56Ohm resistance.
Parts list:
XT90 Anti-Spark: hobbyking.com/en_us/xt90-s-an...
HXT 4mm to XT60 Adapter: hobbyking.com/en_us/hxt-4mm-t...
XT60 Wire Harness: hobbyking.com/en_us/xt60-harn...
XT60 Series Connector: hobbyking.com/en_us/xt60-seri... - Наука та технологія
Great video. So you have put the anti-spark connector on the negative wire - does it make any difference which wire you use the anti spark connector on -neg or +pos ? Does it HAVE to be used on the negative wire?
Thanks. If I understand you right, it shouldn't make a difference because all the anti spark is doing is completing the loop, doesn't matter where in the loop as far as I'm aware. The main reason it appears to be on the negative is because of the way the xt60 series connector is designed.
I was wondering what is the difference between your adapter to connect the battery in series and the second adapter to connect the loop key?
why not just solder everything into a much simpler design?
Yeah you certainly could do that and it would probably be better. I was just using parts I had / used the same parts for other projects so kept things as they were :)
Hi! It seems that the xt90 to xt60 adapter is missing from the description. Which adapter would you use?
Hi Ishan, great question. I made that adapter myself using the XT90 male connector that came with the XT90S, and a XT60 female connector I had lying around. However a typical XT90 male to XT60 female adapter should work. E.g. hobbyking.com/en_us/xt90-male-to-xt60-female-2pcs-bag.html
I was expecting this explanation such as:
Try connecting only one wire of the battery to the vesc. There is a spark? Try connecting both- spark again. Why is there a spark?
Here is how the capacitors on your vesc work when connecting the battery (they cause a spark) WHen measuring current from a capacitor it depends on the change in voltage. so i=C du/dt I current C capacitance du-voltage difference dt . So assuming the capacitor is not charged and is connected to some voltage the change in voltage du is the (0-the voltage)* its connected to so the current spikes for a dt duration (let's say milliseconds) hence the spark. The formula says it all.
Now. Disregarding why the capacitors charge when connecting only one wire to them. The whole idea is that we are keeping their voltage high even when not using the board. Does this consume power? No as there is no path for the current to complete a cycle.
So with he red wire ur keeping the capacitors always up to the voltage of the battery and we just connect the black one for example when wanting to connect the battery omitting the initial inrush current into the capacitors due to the sudden change in voltage they are experiencing.
Is the spark bad? Idk maybe for the connectors, don't sweat about it.
As for all the other questions bellow- most questions can be answered from google. Its just understanding the basics of Electrical engineering, its not magic. read the datasheets of the parts that you want to use - they will have maximum continuous operating conditions which will tell you all about the current and voltage that they can withstand. watch some youtube on Electrical circuits basics.
im back with another question. So to complete the anti spark plug, i need to get a 10 awg wire and simply loop it and connect it to the anti spark and complete right?
Edit: Is it possible i just solder the anti spark plug into the end of the "XT60 Wire Harness" and plug that into my straight into the esc?
Yeah just loop the 10 AWG as shown in the video thumbnail.
I'm not sure I understand your second question, but if you're planning to use an XT60 wire harness, then you could essentially cut off one of the XT60 connectors and replace it with an XT90 instead of using an XT90-to-XT60 adapter like I did. Use whatever is best suited for your build.
Would it be possible to use a XT90 as a removeable plug to complete a power circuit and treat it as if it where like a key to a car? But obviously for an electric skateboard. I'm just not comfortable leaving my board somewhere and someone seeing a visible power button then pressing it even if I have the controller. I'd like to have a key that I take with me that renders my board useless without it. Exactly how a key for a car works.
Hey Anthony, yeah you could certainly use it that way but just as a car has door locks and alarms, I wouldn't solely rely on the XT90 as security. Best to keep your skateboard close. If your concern is just to prevent someone accidentally or intentionally turning the skateboard on and draining the battery though, I would think the XT90 would definitely reduce those odds :)
What are the difference between XT60 and XT90? Im planning to get the XT90 Wire Harness because it seems like thats what everyone else is getting, but if i create a Anti-spark plug can i also use the XT60 parts you listed above with the XT90 Wire Harness? Does each plug have their own amp limit/rating? Im using 2 5s 30c 8000mah battery btw. Thanks
Main difference is size. XT90 is bigger and this allows it to have a higher current rating (XT90 has a max current rating of 90A and XT60 has a max current rating of 60A). The connectors are also bigger on the XT90 which means you can solder on thicker wires - again catering for a larger current draw.
The main reason I used XT60 connectors was just because I had them available, plus my vesc came with an XT60 connector which I didn't want to change. Since you can program the current limits on a vesc (assuming that's what you're planning to use), if you really wanted to, you could probably use all XT90 connectors if that simplifies things.
Why don't they make antispark in XT60? Only 90?
Good question. It does seem like there’s a bit of a niche for it, unfortunately I’m not sure.
hey man great video. i just built my own ebike. my controller connector is a xt60 my 36v15ah battery is a xt90. i bought a adapter so they connect. they do awesome. But i am getting that spark. will this apply and work for my ebike battery and controller and stop the sparking? please and thank you
Hi, thanks! Just from your brief outline I would think it would work. The anti-spark connector isn't too expensive so definitely worth it to try in my opinion.
What if i use the same 3 ways setup but using regular shorted xt90 as a switch ... will it prevent damage as I have notice that the sparks came up through the possitive side of ther xt 90 ?
I'm not sure I understand the setup. This must be done with an antispark XT90 as the switch, using just a regular XT90 will not prevent the spark as it lacks the initial resistance provided from the antispark connector.
so is the reason you don't have the antispark connector on your ESC is simply because its already fitted with an xt60 and you don't want to change it? or is there a particular reason why it needs to be separate?
sorry I just looked at your first video and you explained why.
Hello , i was wondering if the exact same loopkey configuration would work with dual vescs ? I want to make the same anti spark switch but would like to know if it is ok to connect the female end of the anti spark to the male end of a dual parallel adapter connected to both vescs.
Good question. It depends on your setup. The max rated current for an XT90 is 90A so you would want to stay well below that. Most vescs I've seen have a max continuous current of ~50A, so that would generally be the limiting factor of the two, but with two vescs in parallel the limiting factor can be the XT90. In terms of voltage, if it was high enough the main thing would be that it could still spark, but based on the vescs specs I would doubt that. The other thing you would want to do is make sure the wires you're using can handle the expected max current and temperatures.
@@sketchcontainer My batt max will be set on 40A per vesc so it shouldn't be an issue.Thanks a lot for your quick reply. Great video by the way ;-)
@@V-lab Thanks MrDamikenificent. Just a note here, if you're planning on having two vescs in parallel drawing 40A of current each, from a single battery source, that's effectively 80A of current from the battery. From what I can find online, the 10 AWG wire I used in my video has a max current of ~55A, so I would be inclined to use a 7 AWG wire to handle the 80A of current; but this is quite a thick wire so not sure how well it fits with the XT90. Again, I'm not actually that familiar with the dual motor, dual vesc setup so it might be worth checking with someone who has built one themselves and can provide you with better information :)
is it possible to put any onoff switch rather than the anti spark?
If you find an on/off switch with the right specs for your circuit, of course this is possible. The difficulty is finding one with the right specs. Due to the sometimes high current drawn from the skateboard, basic switches are usually insufficient.
There is, however, a switch for electric skateboards already out there, which I hint towards in the video, and I would recommend opting for that if you're looking for a switch for your board.
couldn't you get batteries with xt 60s on their outputs and get rid of the adapters ?
Oh for sure, if you can do it like that, that's even better. In fact, I would have the same thing, but sometimes I use these batteries with a drill that has an HXT connection. Great tip though!
Thanks for the great vids, very clear and concise. Great job. Keep it up.
Cheers mate
HXT 4mm can be completely taken away with 2 snips per battery and some salder...
One last question , would changing the serial cable that connects battery, vesc and loopkey to a serial adapter like this one be ok?
www.amazon.com/Serial-Battery-Connector-Adapter-Compact/dp/B01EIZYM74
Or is it safer to use a 10awg series cable?
They're effectively the same connection so I would imagine it would be ok
where can you get the AWG10 wire?
You can get the wires online from ebay or aliexpress (I got mine from ebay). Alternatively you could try your local electronics shop :)
Why is there no xt60 version and why do the anti spark power switches cost 30-40€????
I'm not sure why there are no XT60 Anti-spark connectors by default, it would be handy if there were. If you really need one you might be able to ask a manufacturer, or I've seen some people online adhoc their own.
In terms of the price, I wouldn't expect the connector to be that expensive. I'm not sure where you're shopping but maybe you could try hobbyking, or even ebay or aliexpress, they usually have some cheap items.
Oh my bad, you meant the actual switches. I think part of it is because it's quite niche so there's probably a bit of mark up there. There's not a lot of switches out there that are designed for this purpose with a relatively high current rating and so I think that's why they're quite pricey. It could be the materials used as well but you'd have to do a bill of materials to really see.
@@sketchcontainer are there xt90s loop keys pre-made or do I have to build one myself? I couldn't anything but the XT90S connector with no shortage or wire.
@@AlpakaAntifa I haven't seen any pre-made ones before so you'd have to build one yourself. I think you pretty much got it with shorting the one side of the connector (like the video thumbnail depicts), but if you just google something like "xt90 loop key" you could probably find some good instructions on how to build one
What's the top speed and range for your board?
I've actually just sold my electric skateboard. Unfortunately I didn't get round to measuring the speed and range, but top speed was more than I was comfortable with, and using google maps, the longest I ever rode was about 5kms and there was still some mileage to go. Sorry I can't give you any exact numbers.
Reaper Sketch that's fine thanks
If you were to build another e skate what would you upgrade or add for longer distance and faster speed
If I were to build another one, I would get bigger wheels and use more cells with higher capacity for longer range and higher top speed. I wouldn't really need more speed but if I did I would look into a higher kv motor. I would also look into using two motors instead of one, to handle hills better.
Reaper Sketch do you think diyelectricskateboards Vesc and 190kv motor. Amazon gt2b remote 2 3s 5000mah and 2 3s 2200mah and an LCD screen is a good setup. I know it's a lot
how do you short the xt90?
Using the male (or female) XT90 connector, you connect the two pins together with a wire (or any insulated conductor) that can handle the max expected current. In my setup I shorted the male XT90 connector by soldering on a strip of AWG10.
does it work well for a key?
and also is it possible that you could make a video on how to do that?
Yeah it works well for its price
Shorting a connector is quite a standard thing, so if I get more requests for this I'll make a video for it. But in the meantime, I've uploaded some photos for further reference at github.com/graduit/xt90-anti-spark which should hopefully make things clearer.
Wy all the connectors its all unneccery and a waste of money
Yeah for sure you could make some improvements, if you want to leave any suggestions feel free :)