Maxwell Boostcap Ultracapacitors
a new power source for electric vehicles:
slightly lower energy density when compared to Lithium Batteries... but not by much from my initial test!
extra weight added to the power system of your vehicle of choice... ie: http://www.youtube.com/watch?v=Qiz-GY30d-E
high voltage discharge...may do this to you if you are a noob... http://www.youtube.com/watch?v=_WheLp0RdLQ ...a potato... http://www.youtube.com/watch?v=BqgxQG1PyfM&feature=related ...a watermelon... http://www.youtube.com/watch?v=gj1pkyCL75E&feature=related ... http://www.youtube.com/watch?v=hIkNY5xjy5k ...get the disclaimer picture
instantaneous charging capability...can you say a 1 minute full charge ...needz bigz wirez thoughz orz thiz wouldz happenz http://www.youtube.com/watch?v=zzKAFS6Lyrg
instantaneous regen capability...can you say absorb most of the available regen energy in a matter of seconds... an analogy from yours truely little twit oldfart dennis http://www.youtube.com/watch?v=6voVYic4aS4
claimed extremely long lifespan if not damaged due to abuse... ie: http://www.youtube.com/watch?v=v5v4_AlDQTo&feature=related ... http://www.youtube.com/watch?v=ZG6GR_Gow0w ... http://www.youtube.com/watch?v=-Nzq2GorVH4&feature=related ...
testing info to follow...
i did wonder at the first post.
3000 farads between 41v and 25v = 440Wh
37v 10Ah = 370Wh
looks like the ultra caps win,
except maxwell don't make a 3000F 48v cap bank.
they make 48v cap bank made of 3000F cells (20 x 3000F cells in series = 150F)
3000F at 48v weighs around 260kg.
165F between 41v and 25v weighs 14.2kg, and gives ~25Wh.
they do increase power density if you are looking for less than 2 seconds worth.
over more than 2 seconds, you are better off with more battery to increase power.
(cheap large format LiFePO4 is at ~500w/kg now, those caps over 2.8sec are also ~500w/kg)
Dennis thanks for sharing beautiful information i recently join the forum and enjoy your knowledge much, thanks
Thanks for sharing.
I wanted to do the same thing once (use ultracapacitors to help with acceleration in parallel with the battery).
And yes, you can easily to regenerative breaking with them.
In fact, I think all the electric cars, and some of thy hybrids have ultracapacitors on board for the regen.
Does your module have a controller to limit the voltage of each Cap?
I have a couple of BionX kits, is there a way that you know of hacking the kit and and adding a few Ultra Capacitors cells to optimise Regen and acceleration?
I would imagine this would also increase the cells life as the Ultra-capacitors would discharge first and capture the excess regen current. I saw somewhere of a methods of hacking a BionX batteries to add LiFePo cells, I wonder if the same method could be use to add UC,
I'll guess that I'll wait until my battery dies or drops dramatically before trying to hack it a bit, it would be great to have an integrated system, If you had ultracap regen efficiency and batteries life would be extended dramatically and the value proposition would change dramatically. But I imagine the logic of how to manage both type of energy sources is not that simple. As it is there is not much advantage from BionX to petrol prices, minus your conscience and your health of course.
Hey guys and gals. First time poster here but I've been lurking for a while. I'm in the planning process of building my first electric assisted bicycle! I've been really excited about the idea ever since I recently discovered electric hub motors. They are AMAZING!!
The reason I am posting here is because my power source will come from BCAP3000 Maxwell Ucaps. These are used, possibly contaminated cells. I will probably be getting around 10 or 15 of these. They seem to have quite a bit of juice and might fit my application. My goal is to make a 35mi round trip commute to and from work (hopefully able to charge at work) with potential speeds for 30mph. Am I crazy for thinking this is possible with these ucaps?
I am overwhelmed with the hub motor choices and I need a good place to start. Right now I'm thinking a kit without the batteries is the best way to go? If I can even buy what I need that way. Before I discovered this site I thought Crystalyte manufacturer was the way to go but now I realize there are many other options. I'm looking for reliability and quality along with helpful customer service.
Looking for a good place to start for a first time builder. I feel like I've got a good thing going with these hand-me-down ucaps but I may be wrong? I would love to get some more information and knowledge from anyone interested and experienced.
Thanks in advance. Glad I found this place. :)
Its exactly what Im doing too. Put a 2.5v 400ma solar cell on each UltraCap (about £5 each) bang the lot in series and ull be amazed. On a sunny day the thing will charge up enough to help each time u hit a hill!
Im getting less than ten minutes when using it continuously, so it is more an aid for slopes and hills giving it a chance to recharge in between
I'm seeing how the 'magic' of supercaps kinda hit the fan when the four letter word came into play : math.
But considering that Dennis only used 1/4 or so of the energy from his caps, 120 yards is not too bad.
I want to try building a switching 'boost' power supply to let such a system get about 3/4 of the energy out of the caps. I agree that the caps can be used for a short duration high current burst.