Re: Battery power for big SSTC

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

Actually, you can probably pull a lot more than 60A from that 60Ah
battery... 200A wouldn't be unusual.. you'd have to watch the heating of the
battery, though.

If the batteries are engine starting types (car batteries), then they're
designed for 100% duty cycle at a low current (20 hour discharge) and for
infrequent gargantuan current (starts at 300A+, but perhaps 30 seconds/hour
duty ).

Indeed, stringing together a bunch of batteries is a good way to get very
high powers without depending on mains current.  My "portable" x-ray machine
power supply originally used 100V of NiCd to put out 100A into the 500Hz HV
inverter.  Charge for 8 hours on the 115V wall socket, make those 10 kW
exposures for 100 seconds, etc.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, September 17, 2003 6:59 AM
Subject: Battery power for big SSTC


 > 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
 >
 >