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Original poster: David Sharpe <sccr4us-at-erols-dot-com>
Tesla list wrote:
>Original poster: Mike <megavolts61-at-yahoo-dot-com>
>I wonder if these could be used in quarter shrinking or rail gun
>applications...assuming you had lot of them in series
They can handle pulse power (currents to 1000A for starter motor assist
true enough). Now for
the ugly truths...
1. They are rated at only 2.5V per cell, (newer to 3.3V max) so you think
an MMC array
soldering is bad, how long would it take you to solder together 4000
of them for a paltry
10kV? Not to mention power connections to handle that current.
2. Capacitor is a Double Layer system closer akin to a battery then an
with polaity separators etc. Plus fact that at least some of the
higher energy units use
electrolyte material that is hazardous (toxic and potentially [no
3. You can over voltage them but life drops as a power exponential to over
to rated, (10% OV cuts life almost in half).
4. They ARE NOT designed for ringwave or voltage reversal. Their voltage
is 0.001%. If you attempt to reverse polarity of capacitor, it
either looses functionality or
blows up! So even in pulse discharge applications they should be
approached with MUCH
Their strong suits are:
Very large energy storage per unit volume, Russians have been using for
many years to start
railroad locomotive diesels electrically at -40F. Also applications
for military (pulse power,
short term memory storage, electric/hybid vehicle power assist).
Large WH per unit liter means some newer devices approach power density of
Not very useful or practical IMO for Tesla or HV pulse power applications.
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA. USA