parabellum
1 MW
I am cheap!Quajochem said:
Why battery packs?
- Thread starter tdneVmoDK
- Start date
parabellum said:I am cheap!Quajochem said:
BTW parabellum.. the 6S 15C 5AH lipos are on flash sale and are $44.90 ea. from the USA warehouse.
Their dimensions and weight are just a few mm larger, and a few grams heavier than 5S 20C stuff..
This is the best wHr/KG lipo i have ever seen on the net and i just ordered 13 of em O_O
Highly recommended if you're going for a lot of AH for a long distance..
parabellum
1 MW
Enjoy it my American friend! :wink:neptronix said:
Quajochem
100 W
(lol)
oldpiper
1 kW
Back to the original question: why battery packs instead of just one big battery?
Two reasons:
One technical - the discharge rate is roughly inversely proportional to the distance between electrodes, because you have to move ions around inside to move electrons around outside. It's a lot easier to make two electrodes parallel and just a few nanosmidgens away from each other for a short distance than for a long distance (and there is a lot less danger of bending the electrodes so they touch, also).
One financial - If you could make the really large cells at a reasonable price, then it still would mean that if it went south (as they all will eventually), you would have to replace the whole thing instead of just replacing a smaller (and cheaper) cell in a pack. There's a tradeoff between convenience (maintenance fewer times with larger cells) and price (replacing cheaper cells). There probably aren't many out there that are running high amp battery packs with AAA-size cells. :lol:
Cameron
Two reasons:
One technical - the discharge rate is roughly inversely proportional to the distance between electrodes, because you have to move ions around inside to move electrons around outside. It's a lot easier to make two electrodes parallel and just a few nanosmidgens away from each other for a short distance than for a long distance (and there is a lot less danger of bending the electrodes so they touch, also).
One financial - If you could make the really large cells at a reasonable price, then it still would mean that if it went south (as they all will eventually), you would have to replace the whole thing instead of just replacing a smaller (and cheaper) cell in a pack. There's a tradeoff between convenience (maintenance fewer times with larger cells) and price (replacing cheaper cells). There probably aren't many out there that are running high amp battery packs with AAA-size cells. :lol:
Cameron
Lebowski
10 MW
I'm thinking about getting a cow or a horse and taking out one of it's
rear leg muscles. Then I'll connect the muscle between a fixed frame point
and the crank. Then I just need to build a container around the muscle so
the liquid energy source (beer) doesn't leak out and some sort of piezo-electric
electrocution device to fire the muscle at the correct moment.
who needs batteries ?
rear leg muscles. Then I'll connect the muscle between a fixed frame point
and the crank. Then I just need to build a container around the muscle so
the liquid energy source (beer) doesn't leak out and some sort of piezo-electric
electrocution device to fire the muscle at the correct moment.
who needs batteries ?
parabellum
1 MW
Other side is mass production. Small cells can find use in much more applications. starting from small electronic devices up to big EVs and energy storage applications.
Lock
100 MW
Sounds spendy. One glass of 5% Carlsberg = 82 food cals = 95Wh.Lebowski said:
Not sure about conversion efficiencies, but probably not good...
A small chunk of plutonium-238 would do me... Research into Advanced Stirling Radioisotope Generators going well:
http://www.grc.nasa.gov/WWW/TECB/RPS_ASRG_ Handout.pdf
Any ebiker in Alaska might take a quick boat ride across the Bering Strait as Chukotka has about 150 old radioisotope thermo-electric generators (RTGs) with strontium-90 power cores just laying about free for the taking...
Terrific page here BTW on old-school and more modern thermo-electric generators `case anybuddy wants to run their ebike on propane etc:
http://www.neazoi.com/technology/thermocouple.htm
L0cK
parabellum
1 MW
For 160 We constant for 14 years could make space for 20kg module on my bike!Lock said:
daveyjones97
10 W
- Joined
- Dec 7, 2011
- Messages
- 77
saw an article in car magazine a while back about some battery that can have its electrolyte replaced within 10mins. it was in some ecar and the deal was that filling stations would exchange the electrolyte. cant remember the details. also hydrogen is coming on, but i dont see it beating battery tech for ebike suitability anytime soon
Patriot4
100 mW
Probably Vanadium Redox
parabellum
1 MW
neptronix said:
My personal, Little Fukushima.
e-beach
10 MW
OK, so I haven’t flown my tin foil kite yet, but Tesla said that more radiant energy is evident at higher altitudes. In the mean time, I will have to go with my cursory experimentation.
A true story.
I hung a 2’ x 5’ piece of tin foil from a bookshelf in my second story bedroom. I connected one wire from the center of the foil to the positive end of a small capacitor.
Outside, I pounded a 1 foot long piece of iron rebar into the ground. I attached another wire to it, ran it up the side of my house, into the window and attached it to the negative side of the capacitor.
After 12 hours I measured the voltage on the capacitor and it had gone up, not by much, but it had gone up.
I then wondered if radiant energy was AC. Tesla liked AC so I hooked a rectifier up to the wires and sure enough, the capacitor started filling much more quickly.
Turns out radiant energy is AC!
After a week I measured the amount of energy I had collected in my capacitor and extrapolated that with that amount of tin foil it would only take 20 to 25 years to recharge 1 AA battery.
Beyond that I extrapolated that if you had a about 6000 square feet of tin foil surface you could recharge a AA in about one day, give or take.
Conclusion:
If you had a really big back yard and a very large roll of tinfoil, you could power your bicycle on radiant energy as long as you ride no further then your wires can reach.
This spring I am going to fly my tin foil kite, watching out for the power poles of course! :wink:
A true story.
I hung a 2’ x 5’ piece of tin foil from a bookshelf in my second story bedroom. I connected one wire from the center of the foil to the positive end of a small capacitor.
Outside, I pounded a 1 foot long piece of iron rebar into the ground. I attached another wire to it, ran it up the side of my house, into the window and attached it to the negative side of the capacitor.
After 12 hours I measured the voltage on the capacitor and it had gone up, not by much, but it had gone up.
I then wondered if radiant energy was AC. Tesla liked AC so I hooked a rectifier up to the wires and sure enough, the capacitor started filling much more quickly.
Turns out radiant energy is AC!
After a week I measured the amount of energy I had collected in my capacitor and extrapolated that with that amount of tin foil it would only take 20 to 25 years to recharge 1 AA battery.
Beyond that I extrapolated that if you had a about 6000 square feet of tin foil surface you could recharge a AA in about one day, give or take.
Conclusion:
If you had a really big back yard and a very large roll of tinfoil, you could power your bicycle on radiant energy as long as you ride no further then your wires can reach.
This spring I am going to fly my tin foil kite, watching out for the power poles of course! :wink:
