DIY Electric Car Forums banner

Supercapacitor storage bank ?

13635 Views 71 Replies 9 Participants Last post by  somecallmetim
Sorry if this product has been raised before, i searched and nothing came up.
Kilowattlabs Sirius Supercapacitor storage "battery "
Several of the other forums ..Solar, EV, tech , etc...are having some debates over the Sirius product which claims to be the first Supercapacitor based storage device for use with Solar systems, utility storage, EVs, RVs etc etc
They claim it can replace any current Lead ,AGM, or Lithium, battery function.
Infact the list of claims are extensive, not least being rapid charge/discharge, 99% efficiency, million cycle life with no capacity reduction, totally fire safe (non combustable materials) , and $1/Wh price point.
Note they are initially offering 3.5kWh and 7.1 kWh , units with other sizes and voltages to follow.
Obviously if any of this is true, then storage has truely advanced instantly, but as many of us realise, these claims go beyond any current proven Supercap performance abilities.....hence why there is hot discussion raging.
Some of you may already be involved in those discussions on other forums , but my reason for raising it here is to rais awareness to either help prove/disprove the validity of this device such that we either can avoid it or benefit from its technology.
1 - 4 of 72 Posts
Old news is old but...

Duncan said:
So 8.5% at 44v and 95% at 53v

Just don't see how you do that with Supercaps unless you set the "zero" at 40v
So if 2.7v is full then "zero" would be 1.9 volts

Maybe that is how they do it - it's actually a 12 kWh pack and they are only using the top 3.5 kWhs
The energy stored in a capacitor is not linear with voltage as it (sort of) is with batteries.

Energy = Capacitance * Voltage * Voltage / 2

So at double the voltage you have 4x as much energy. At 4x the voltage you have 16x as much energy.

It does actually make sense that the voltage skyrockets immediately under very little current flow, and that by the time you drain it even to half voltage, most of the energy is long gone.

Vaporwear is vaporwear.
With constant current, voltage increases linearly with time for a capacitor.
I don't think that's true.

As you add energy into the capacitor, voltage increases as per the formula.

In any case, was just nitpicking a point Duncan made.

It's important when something is bullshit, that the reasons you debunk it aren't bullshit too. This thing is bullshit enough that it is plenty sufficient to debunk it using a dozen valid arguments, so it's important to make sure those are accurate. Duncan was on the right track but, off on one attribute.

I say this as someone who occasionally picks up bits of context in threads like this and finds out years later it was wrong, or years later come across threads like this where no one corrected it and then "learns" something untrue.

Evidence is clear they're LTOs, nothing to see here.
Hopefully not a hijack, not sure this thread has much more use in it, after its thorough debunking...

Yes. But constant current doesn't correspond to constant energy per time, it corresponds to constant charge per time. And, for a capacitor, voltage is charge divided by capacitance and energy is charge times voltage. So constant current means energy is going up as the square of time. And since voltage goes up as the square root of energy, voltage goes up linearly with time.
Hrm, I'm half-following you here. (I'm sure it's a fine explanation, but I have only a beginner's grasp of it). I get that energy and current are different, and that voltage starting low means energy going in starts lower, I'm just not sure the two cancel out entirely, one is squared, one seems linear to me.

But let me rephrase what you're claiming...

If I take a constant-current power supply, set it to some low current with a max voltage of whatever my capacitor is, and pick a capacitor that is large enough that it charging is watchable on a human-timescale...

Suppose I pick a 50v capacitor. And I measure and it takes, oh, 5 minutes to charge at whatever rate I picked. You're saying that at 1 minute it was at 10v, 2 minutes it was at 20v, 3 minutes it was at 30v, 4 minutes it was at 40v along the way?

I'll have to try that on some suitably-sized capacitor some time.
Thankfully, weber is doing a great job of hosing down the BS. !
Weber just slayin' their claims left and right.

'We're still waiting for you to explain why, when you remove the Kilowatt Labs sticker from your claimed USB-chargeable AA-sized "graphene supercapacitor", it says "LTO" and "battery"? And why the words "graphene" and "capacitor" are nowhere to be found?'

Merciless :p
1 - 4 of 72 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.