super caps

[matt20]

I came across these super caps and would like to know if anyone has used them. What I like about them is their cycle life > 5000.

I'm building 12 volt battery packs for an RV and would like to have something that is dependable, light and long lasting... I'm using optima lead AGM batteries now, and they seem to discharge too quickly, heavy and low cycle life. I'm done with lead.

I'm going to make a basic 40 amp hour battery to start with. I don't know what the best approach to balancing them would be? BMS? Any ideas on how to get there? I forgot, safety is big -- don't want to burn up.

http://www.electriccarpartscompany.com/NEB-Super-Caps-br-10-100Ah-32V-br-LiFePo4-Lithium-br-Super-Capacitor-Batteries_p_156.html

 

[agniusm]

Sorry for dumb question, but whats RV? Here is info about various BMS systems: http://liionbms.com/php/bms_options.php
Lifepo4 chemistry is most safest. I tested A123 cells with axe and shotgun and all they do is smoke, heat up but don't catch fire.
Boys back here tested those supecapacitors and got good results:

 

[fivari]

I asked for a quote for these supercapacitors (that don't have anything to do with capacitors, it is just a marketing term):

Thanks for your kind inquiry for our hybird supercapacitor li-ion battery products!
For your inquires, please find our answers below:

32 units of 20Ah hybrid supercapacitor 3.2V
USD1088.0 or 34$/pc

16 units of 10Ah hybrid supercapacitor 3.2V
USD272.0 or 17$/pc and so the same price per Wh as the 20Ah

Shipping to Belgium.
We can send sample products by DHL or Fedex, please confirm the quantity so that we can calculate the shipping cost!

Also the price for bigger quantaties like:
400 pieces of 20Ah hybrid supercapacitor 3.2V
USD13600.0 or still 34$/pc

They have the advantage over the pouch cells to have these bolt connection. On the other hand they are less compact.

 

[psomero]

what a bunch of misleading jackasses...

 

[Punx0r]

Have a search on here for super capacitors - the information on energy density and usable capacity may change your mind, and hopefully avoid you potentially wasting money.

 

[TylerDurden]

Supercaps are friggin awesome... if you're building a rail-gun.


Traction applications, not so much, at half capacity, you get half the voltage.

 

[matt20]

Thanks for the replies. I think they may be a little too much money... but I'm not sure... If they are reliable and get 5000 cycles.

An RV is a recreational vehicle... It may be a generational term. I'm getting close to retirement. I have a sprinter van that is converted for long trips. I can carry bikes on the back and see the country... It sleeps 2, bathroom, kitchen, 22 miles per gallon (diesel).

I am making a battery pack out of lithium batteries. I don't want to wake up smelling smoke, so I'm looking for safe chemistry. I think that about 200 amp hours would work out pretty well. I might get by with less -- modular approach. I'm thinking it will cost about $10/amp hour.

 

[Hillhater]

If you are comfortable "building" a pack from cells, look up the A123, 20Ahr pouch cell threads. (There are many)
http://endless-sphere.com/forums/viewtopic.php?f=14&t=38761
http://endless-sphere.com/forums/viewtopic.php?f=14&t=38901
At approx $25 each, they would work out much cheaper than your budget $10 /Ahr @ 12v
You might also want to check out EVTV where they have looked at most battery options for EV's and seem to have concluded that CALB cells are the way for max reliability.

 

[agniusm]

Oh, ok, this is easy then. buy 4x40ah supercapacitor cells, get 4s bms of bmsbattery.com, you can choose discharge 20-40amps or 90-150amps depending on what electric stuff you will connect. Optionally you can install solar panel on the roof and charge your battery through solar conttoller.
200ah supercapacitors in 4s2p configuration would set you back 2000usd plus 60usd for 160a bms plus shipping cost. Dont start with a123, will be easier with supercaps. you will be able to draw 1.9kw for your stuff.

 

[agniusm]

Have a search on here for super capacitors - the information on energy density and usable capacity may change your mind, and hopefully avoid you potentially wasting money.

what a bunch of misleading jackasses...

Supecaps are friggin awesome... if you're building a rail-gun.
Traction applications, not so much, at half capacity, you get half the voltage.

You have to read the whole thing. Liyuan supercapacitor is LiFePo4 chemistry lithium battery not capacitor !!! Just a marketing name.

 

[agniusm]

Here is the stuff you'd need:
8 cells @ 250USD = 2000USD
1 BMS @ 59USD = 59USD (http://www.bmsbattery.com/bmspcm/405-10s-lithium-ion-bms-for-bottle-battery-case.html)
11 Braided Cell Interconnector @ 3.15USD = 34.65 (http://www.evworks.com.au/index.php?product=146)
TOTAL: 2093.65USD + Shipping
BMS will allow for 12V x 160A = 1920W discharge
Battery packs would allow for 5C x 200AH = 800A x 12V = 9600W discharge.
Hope this helps

Oh and think this would be safe, just need to check cell voltages time to time.

 

[Punx0r]

Liyuan supercapacitor is LiFePo4 chemistry lithium battery not capacitor !!! Just a marketing name.

Someone needs a punch in the stomach for calling them such a stupid name...

 

[agniusm]

Well, not really, they produce a lot of supercaps (caps) as well.

 

[Punx0r]

Yes, really!

It's hard to think of a more deliberately confusing example of product naming.