Maxwell Ultra-Cap's/Lithium cells hybrid pack

[zeropointbug]

Yes, you can 'always' add more cells, but thats not the point. This is a redundant add-on, it will take away all the strain from the batt, WHATEVER the battery pack may be. THeoretically it will pay for it's self.

-Cells will last alot longer
-safer for esc
-better performance
-guaranteed rated battery cell life (you will never get rated cell life in RC apps)
-it's more of a one time buy, they last 500,000 duty cycles, they are not wearing out anytime soon, they will be there new pack after pack...

[zeropointbug]

The future of energy storage will most likely have to do with capacitor type storage.

[Serum]

And only then they are interesting, this is what i said in a previous post. (fast charging, fast discharging, long lifetime)

All the possitive things you name are also a fact with adding more cells, but the biggest point is that you will gain more than double the runtime..

A reason for me NOT to use them (in case you didn't noticed my opinion on them)

[aqwut]

you think that capacitors would really help?... a long time ago.. I use to use the 10, 000 uF caps and I didn't really notice any difference... they where 1" x 1" x 1"

[zeropointbug]

AQWUT, you were using 'capacitors', you had '10,000uF'

I am talking about 'ultra-capacitors', let say '140,000,000uF' for the same size.

QUITE a big difference, they are basically super concentrated capacitors, they are double layered(electrode plates), and have a few other tricks.

[Serum]

and they are heavy!

[zeropointbug]

230 grams for 8 cell pack?! I wouldn't call that heavy!

[Serum]

:031: what happened to the 480 gramms you talked about in your opening post.?

[zeropointbug]

HAHA, here we go again Serum. 480 grams was a larger bank, which is unnecessary large. The 140 Farads would do it, prob the 120 Farads too.

[BrianG]

OK, I think I'm going to order several of these caps and make a "2s2p" bank for a total of 11v and 1F and install it on my Jato for giggles. All I need is an Eagletree to take some readings on voltage drop. I guess I could strap my Fluke meter on top and set it to record min/max/average voltages...

[zeropointbug]

Brian, i really don't think 1 Farad will do the job, that would only be 60 Joules, even if you used 1/4 of that on a burst you are down to 3/4 the voltage, prob higher than your batts in the first place. It might have too high resistance/impedance you think? I don't think they will help it. You could try it though, they're only $3.50...

[BrianG]

I see what you are saying, but I know how much difference a 1.2F cap makes with my 800w (conservative rms) car stereo when pushed. Without it, the headlights dim quite badly. With it, the dimming is hardly noticeable. Of course, more capacitance would obviously be better, but 4 of those small caps won't weigh much at all or take up much room and will at least help somewhat. They will be going to go in the rear battery compartment of the Jato. If I can fit two more in there (1.5F), I might try running 2s1p since the pulse load on the battery will be less.

[BrianG]

Originally Posted by BrianG

OK, I think I'm going to order several of these caps and make a "2s2p" bank for a total of 11v and 1F and install it on my Jato for giggles. All I need is an Eagletree to take some readings on voltage drop. I guess I could strap my Fluke meter on top and set it to record min/max/average voltages...

Well, scratch that idea. After looking at those caps a little more closely, I started to wonder if the terminals and internal conductors could pass the kind of current I'm looking for. So, I finally found a datasheet and found that the rated continuous current is so low that it would be all but useless. They are designed for long, very low current discharge (in the mA range).

[zeropointbug]

Really? I would have thought that they would do fine as far as current.

Maxwell Technologies haven't replied yet on the email about the 120,140,310,and 350 Farad medium size cells. Im starting to think that the smallest cell, the 120 Farad cell should be enough. Enough to keep the voltage of my pack at least 16.0 volts (16.5volts nom.) under normal driving, which is bashing for me. But you know what, it would be so cool, cuz if you let the truck sit a couple seconds you would be able to bring the system up to no load voltage, which would be 17.25 volts (around 3.45 volts/cell), and then get a huge burst of NOS. :026:

I just hope the caps are around 20-25 dollars a cell.

[Serum]

Arh.. The blinging light problem.. Get Xenon lights on your next vehicle, and the blinking problem will be gone.. LOL

indeed, for a car a 1F takes away some punnish.