Re: Battery power for big SSTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

There doesnt seem to be any reason it WONT work.  Though 20 car batteries 
is a few hundred pounds!  Things to make note of: pure DC makes short HOT 
sparks... not really in our best interest.  You can design an interrupter 
to simulate a 60hz pulsed coil, or any frequency for that matter, BUT at 
high power this gets tricky!  You need some sort of ZVS detector that 
controlls the interruptor so that the interrupter only turns the coil ON 
during the zero volt transition.  You dont want to turn the coil on when 
the mosfets would be in full conduction or else you could get some rather 
nasty transients.  I think the same idea applies for turning the coil back 
off.
But its probably not too difficult to design an interrupter to meed these 
needs.  And that would be a nice power supply!  I would hate to have to 
recharge it though :P

Steve Ward


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Battery power for big SSTC
>Date: Wed, 17 Sep 2003 07:59:27 -0600
>
>Original poster: Matthew Smith <matt-at-kbc-dot-net.au>
>
>Hi All
>
>Inspired by Dan's 10kW SSTC, I was wondering if anyone considered car* 
>batteries** as a power source for larger SSTCs?
>
>I am able to get batteries which are not quite good enough to start an 
>engine but can nevertheless hold a charge, for free.  I use a bank of four 
>to run an ex-telecomms inverter - can give 300W for several hours.  This 
>got me thinking...
>
>A 60Ah battery can deliver 60A for an hour when new.  When old, we can 
>probably still get 60A, just not for so long.  If we hook up twenty of 
>these 12V batteries, we have 60A -at- 240V = 14.8kW to play with. (Yikes!)
>
>Could this be a way of overcoming the limitations of smaller domestic 
>supplies?
>
>Cheers
>
>M
>
>
>
>* Automobile for those in the USA
>* I should really call them accumulators.
>
>--
>Matthew Smith
>Kadina Business Consultancy
>South Australia
>http://www.kbc-dot-net.au