Nichicon "supercaps"

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UM series leaded .
"High voltage" (2.7V compared to older 2.5V UC series
0.47 to 47 Farad

        http://www.nichicon.co.jp/english/products/pdf/e-um.pdf

Note leakage of 0.5C mA - ie 23.5 mA for 47 Farad cap.
A 47 F cap at full charge stores about 150 W.s of energy so 
at 23.5 mA, 2.5V it loses 2.3%+ of its energy per minute. At 
constant rate ("which you have not got"*) it would self 
discharge in under an hour !!!

You need 50+ of these to equal the energy stored in a 2000 
mAh NimH AA cell.
You need 150+ of these to equal the energy stored in a 2000 
mAh 18650 LiIon cell.

UC series 2.5V

        http://products.nichicon.co.jp/en/product_detail.cfm

UC selector guide

        http://products.nichicon.co.jp/en/part_search/part_list.cfm
________________

The big boys.
JL series
400F to 2600F
Screw terminal.
"Suitable for regeneration and UPS applications"
STILL 0.5C mA leakage - SO 2600F cap has 1.3A leakage !!! 
:-).

    http://www.nichicon.co.jp/english/products/pdf/e-jl.pdf

2 milliohm DC resistance for the 2600F.
7 milliohm for the 400F.
Hmmm. 2.5/0.002 = 1250A :-)
2.5V x 1250A = 3 kW+
"Not for long" [tm] though.
'May have problems' with contact & lead resistance.
Clearly though, shorting these would be a 'bad idea'.

A 2600F 2.5V cap has about the same energy storage capacity 
as a single NimH 2000 mAh AA cell. \

        http://www.nichicon.co.jp/english/products/pdf/e-jl.pdf


________________

Application guidelines for Nichicon "EVerCAP" Supercaps

        http://products.nichicon.co.jp/en/pdf/e-ev_gui.pdf






        Russell




* non sequitir, gargoyle knows:

            "which you have not got" "naming of parts"



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