Re: Battery power for big SSTC

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

Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net> 

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, September 17, 2003 8:59 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 not. Not sure about car batteries, but all the lead rechargable
batteries I come across are rated at a 20 hour rate. I think you get less
than half the rating if you run it for an hour.

If your car batteries are free, no loss, but they are not deep cycle and
fall apart when you charge and drain then flat and start all over again.

Marine and UPS (not toy UPSes that plug into an outlet) batteries are deep
cycle and can be drained over and over again.

KEN

 > 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
 >
 >
 >