I wonder how much of an effect this really has, by the way that reads it should be beneficial for FLA in the winter?I like the part that says:
"[without capacitors] The resulting current surges in and out of the
battery tend to generate extensive heat inside the battery,
which leads to increased battery internal resistance – thus
lower efficiency and ultimately premature failure"
Thanks for that Duncan, saved me having to ask how to convert capacitance to ah. Stuff must be meg a cheap in the states, 3000f Maxwell caps to buy here AU$2,123 for 26 units. At 48v not quite 0.5ah. With a motor looking for 650amp peak that's not much of a buffer.Hi Michael
144v x 160Ah TS = $10,800 energy = 23Kwhrs
52 off 3000F capacitors
at 144 v - energy = capacitance (3000/52) x 144v x 144v x 0.5 = 589,153 Joules
589,000 joules = 166whrs = 0.166Kwhrs
That is if you can use the power all the way down to zero volts - SAAAG!!!
If you use a second voltage booster you could use down to 100v
energy = 3000/52 x 144 x 44 x 0,5 /3600 = 50Whrs
23Kwhrs = $10,800 for TS = $469/Kwhr
50 whrs = $2,000 for caps = $40,000/Kwhr
Sounds a little more expensive to me!
Way back in 2003 the batteries available had much higher internal resistances most were only capable of a 0.5C discharge - a supercap pack stiffener was a good idea then
An idea that is past its time
The motor I'm looking at using at the moment is the 48v Green Motorsport that is matched to a 650amp controller. I plan to use this as a hybrid drive for my motorhome conversion so it's other function is regen braking, with the bus weighing around the 10 tonne mark there will be lots of regen. If the ultra caps could soften the impact the Thundersky batteries would cop from that amount of regen then they would be a viable proposition but simply adding an additional 100ah to the battery bank for around the same cost it looks to me to a better way to spend the money. If the ultracaps could absorb the regen load and release it slowly into the batteries I would get a better cycle life but they don't have the capacity to absorb more than a few seconds from what I can see. I may have got that all wrong, I'm very green at this stuff.Hi Ti
AU$2,160 will buy another 16 100ah Thundersky cells. Min 200ah rate at 3C max charge/discharge = 600amps, another 100ah at 3C gives me 900amps, sounds far more logical to me. Am I missing something?
I must be getting old - did not understand - can you explain a bit further what you are planning?