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How much Power Output is a Cap Pack Capable of?
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- Опубликовано: 19 июл 2020
- A capacitor is not capable of supplying a significant amount of power for much time at all. However, they are capable of supplying quite a bit of power for a very short period of time. It is within this capability that capacitors play an important role within our ESC's. In this video we also review ripple voltage and the purpose of a capacitor bank installed in conjunction with the ESC.
This is with no doubt the best electric power system channel on the RUclips, congrats. As a Mechanical Engineer I really appreciate learning the fundamentals and theory behind the hobby. I'll be installing CC 12V 880uf cap packs on my 60cc electric setups to reduce the load on the ESC as I fly 3D/XA and usually get very hard on the throttle stick.
Hey Ronaldo, thank you for the awesome comment. It certainly means a lot to me and keeps me motivated to make more videos! If your ESC is able to datalog the ripple current, you will be able to see where your system is at.
I actually built a 1.2F cap bank... Because I can 😛 You're spot on with the explanation. Cap bank is basically there for line filtering so your ESC is happy. One other thing I want to mention is most of the cap banks are subpar quality. They typically use average quality general purpose caps without high ripple current ratings like you'd get in say quality automotive grade caps.
the problem ive found with larger cap packs is they arc when you connect them to the battery. this can damage the connector over time. im going to try the arc eliminator xt90 connectors to see if that fixes the problem. it does keep the esc nice and cool though. also, killmode rc makes some nice audio grade cap packs if you dont feel like making them.
Hey Isogen, thanks for the comment and input! A 1.2F cap is quite large. Is this for car audio by chance?
Hey MadScientist, plugging in abattery pack to the ESC usually results in a spark. This is most evident starting at 4s and the spark gets louder and hotter as voltage/cell count increases. You are spot on with more capacitance leading to a larger spark. When you use the anti spark connectors, this problem will go away.
@@RCexplained I actually used it in a coil gun project. And I'm kind of tempted to take the shell off my Typhon and figure out how to mount this on :P
Nice!
Great and to the point!
Thank you for doing that:))
Hey Raz Shifrin, thanks for the comment! Appreciate it!
Apart from voltage and capacitance what spec should i check for each capacitor? I don't want to end up buying the wrong one...are some kind of technology preferrable or i can go for the 101 cap i see on ebay?
Is it good 2 fit large cap like 6000uf on 2s
..Gracias
How does one calculate for a cap pack uF size?
Ok. So more capitance and higher voltage caps the better?
How do I determine what size caps I need for my 2s 8.4 drag set up. 880uF 35 volts. Without tearing one apart I'd love to know
Excellent video as usual. Question, would it be better to have a bank of smaller caps, or a single larger one? I like to solder on a single 3300uF 35V cap to my ESC battery leads, would getting a bank of smaller caps be more beneficial? Thanks!
Hi Spacecadet, thank you for your comment! A larger single capacitor can work, however smaller capacitors placed in parallel has a couple added benefits. Mechanically, smaller capacitors are able to dissipate heat to the air more effectively by using a larger amount of surface area. The second benefit is that smaller capacitors in parallel will reduce the total amount of inductance vs a single larger capacitor. Both of these points add to the reliability of the system.
Great video, thanks for the info!
Hey Matt, thanks for the comment! Appreciate it!
Great vid ryan
Thanks Colin!
I have a dbxl-e 2.0. I'll be installing an r-snake flier 400a esc paired with a leopard 58113 870kv motor running on 8s. While I don't drag race, I do use full throttle up to 10-15 seconds or a little longer at a time. Would you recommend me using a cap pack? This is a 1/5 scale buggy. My main concern is just to help protect the esc. The batteries I use now are 100c and they tend to drop voltage on full throttle, but I am planning on getting higher c rated batteries 120c+ even if the mah is a little lower.
Edit: I know the system will be drawing over 300 amps on full throttle.
Something else do you think it is best to use more smaller capacitors in micro farads but in total the same amount of Mf. For example one capacitor of 4000mf or four capacitors of 1000mf each?
A larger single capacitor can work, however smaller capacitors placed in parallel have a couple added benefits. Mechanically, smaller capacitors are able to dissipate heat to the air more effectively by using a larger amount of surface area. The second benefit is that smaller capacitors in parallel will reduce the total amount of inductance vs a single larger capacitor. Both of these points add to the reliability of the system.
@@RCexplained thanks again for your reply
Always wanted to ask you that question
Good timing then. Someone did ask that question and I didn't know how to answer it through an email. A video topic made this easier. I hope the main points were clear enough to answer your question!
@@RCexplained 👍
Thank you and good info 👍🏻
Glad it was helpful!
Thank you good vid and info💯🙂
Hey FuriousWolf777, thanks for the comment!
How many voltage and uf I need to run 6s?
Kindly so how can I calculate how much micro farads I should use, for example I use 6s battery so I used 35v capacitors but I wasn't sure how many capacitors I should use for a speed run so I made seven capacitors of 2200 micro farads each connected in parallel and 35v but I can't tell the difference that it made because I am using Max6 esc and 1720kv motor but they don't have the telemetry so I can't see what is happening?
Hi Joseph, the calculation is quite complex with many variables. (Very Complex)
Using 7 2200 μF in parallel is a lot of capacitance. I can't see you requiring more.
@@RCexplained thanks for your reply
Get a castle xlx for speedruns , and cap pack killmode , or ripple killer
Great video, I knew there was more I wasn't considering before I add a cap bank to my rc car. I've been considering using super/ultra capacitors though. Thoughts?
I don't know enough about super capacitors to comment. Off the top of my head, I would not expect them to provide much more of an advantage vs capacitors.
@@RCexplained www.spscap.com/difference-capacitor-supercapacitor.html
From my limited knowledge, much much higher capacity, lower ESR, while keeping all the benefits of a regular cap.
If you’re doing speedruns and you lose esc power or lipo comes unplugged you’ll be able to safely use the servo to steer your car of the road with the power left in the cap packs. Imagine 140mph with a sudden loss in braking or throttle input 💀
So they do a lot but they really don't do much... Got it
I need this explained in more layman’s terms.
Hi GaFFLe, what are you trying to do with Capacitors?
@@RCexplained Power my 5th scale DBXLe 2.0. XLX2 ESC w/ 1100KV motor and eliminate ripple. I see some 50v cap packs with 12000uf and some with 19000-28000uf. I’m wanting to have the most reserve power but not too heavy for the cap pack.
12,000 should be way more than enough to handle some ripple voltage.
@@RCexplained Thank you!
Black board is easier to see the writings compared to the white board.
Yes, sorry don't have one.
That made my brain hurt......
Sorry!
ty for the videos. great stuff. i have some important questions in regard to choosing a set up for a 1/5 on road car. would you have a email address that i could send the questions. ty
Hello, email address is on the about page.
@@RCexplained I massaged you on fb
@@paulpeters2081 you have a reply