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DIY lithium banks

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Re: DIY lithium banks

Postby wagonrunner » March 5th, 2019, 10:20 am

88sins wrote:different skyboxes deal with what could be deemed hazmat in different ways. what one won't ship, another will without a problem.
https://gizmodo.com/faa-bans-cargo-shipment-of-lithium-ion-batteries-on-pas-1832947332
The Federal Aviation Administration and the Department of Transportation on Wednesday issued an interim rule banning the transportation of lithium ion cells and batteries as cargo on passenger craft, as well as setting a 30 percent charge limit on ones shipped as air cargo.

There will be a backlog by air. by sea would be the better option.

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Re: DIY lithium banks

Postby X_Factor » March 5th, 2019, 11:57 am

sea feight is also 50/50
once the item has a specific UN number labeled on the packaging you will need hazmat
found out the hard way when i ordered some lit ion cordless drills wit laparkan
hazmat is 250usd to ship

one of the get arounds is to have it delivered to someone in the US and have them repackage labeling it as capacitors or anything that does not contain the word lithium and then ship that over

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Re: DIY lithium banks

Postby adnj » March 7th, 2019, 1:06 pm

88sins wrote:
adnj wrote:Actually, current supercapacitors have an energy density of 2% to 10% of LiIon batteries and about 8% to 40% of lead acid. They also have voltage/current supply curves that are similar to LiIon .

88sins wrote:caps will be more like 4.1ah, and the small ups batteries are about 7-8ah. but the advantage of the caps is that they will recharge faster, supply more power more steadily, and have a better lifespan and deeper discharge rate than the Pb acid battery.

edit
going to be lighter to, as well as more efficient and cheaper in the long run.


yes, but we must keep in mind exactly what caps are and what they are designed to do.
they are not batteries, they don't function like batteries, and they're not made for charging slowly or holding large amounts of electrical current with minimal discharge over long periods of time. that's what batteries are designed to do. comparing them to batteries is kinda like trying to compare apples to grapes. they're both fruit. but that's where the similarities end. same for comparing capacitors to batteries, they both hold and discharge electrical energy, but in totally different ways.

basically, they are used as a way of supplying the amp with all the power it wants as fast as it wants it while protecting the vehicles battery from being drained too low, too fast and too frequently.


I believe that you stated that a supercapacitor storage bank was lighter than a battery for a certain amount of energy. That is unfortunately incorrect.

Additionally, large amounts of energy are typically stored in supercapacitor banks. They just happen to be quite large.

There are many reasons to use either electrostatic or chemical storage but for the stated purpose of packaging an audio system power backup in a passenger vehicle, chemical currently has the best packaging and weight characteristics that meet your constraints without reengineering the powertrain.

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Re: DIY lithium banks

Postby X_Factor » March 8th, 2019, 11:20 am

Movements
FB_IMG_1552058324415.jpeg

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Re: DIY lithium banks

Postby L'Audi » April 16th, 2019, 1:05 pm

Update: I'm about to do some in-car testing on some 5.5Ah Ford CMax cells, it's gonna be in a 4S3P configuration for a 15Ah total.
Pending the outcome, a second bank will follow.

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Re: DIY lithium banks

Postby X_Factor » April 16th, 2019, 6:37 pm

Awesome

That holds 3-4k rms easy
Wats ur charge voltage

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Re: DIY lithium banks

Postby L'Audi » April 17th, 2019, 8:58 am

X_Factor wrote:Awesome

That holds 3-4k rms easy
Wats ur charge voltage


Yup, and they do great on music. There's a guy daily-ing a single 15Ah bank on a Soundigital 8k at a half ohm and doesn't go under 13.9- full tilt.

My voltage is gonna be somewhere in the low 15s.

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Re: DIY lithium banks

Postby X_Factor » April 18th, 2019, 7:17 am

at that voltage you are good to go
since its a small bank use full copper bussing if u can, instead of the 6061 aluminum

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Re: DIY lithium banks

Postby L'Audi » April 18th, 2019, 8:18 am

X_Factor wrote:at that voltage you are good to go
since its a small bank use full copper bussing if u can, instead of the 6061 aluminum


This is my shts and giggles bank so I'm using 6061- I won't have it or long before moving to a 120Ah unit, later next month. But at $11 a cell shipped, I couldn't help myself.

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Re: DIY lithium banks

Postby Team2lo2flo » April 19th, 2019, 1:59 am

CMax Ftw!

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