144vdc charging [RE-wrenches]

[Matt Tritt]

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Hi Hugh,

As you no doubt remember, the early Jacobs were commonly available in 120
volts. One problem with this configuration was the inherent danger in
maintaining a high voltage battery bank, especially for the average farmer.

I was working at one of these installations (about 22 years ago!) when I
witnessed just how much potential for disaster there is with high
voltage/unlimited amperage and short circuits. Let's just say that plasma
cutters don't have much up on a 5/8" spanner connecting the + and - poles of
a 3,000 amp hr. battery at 125 volts. Fortunately, besides a very impressive
fireworks display and a wrench with a missing middle section, the only
personal damage to the guy was a pretty bad burn on the palm of his hand.

I know that a 48 volt bank can be dangerous, but the potential for bodily
harm @ 120 + volts is so much greater.

Matt T
----- Original Message ----- 
From: "Hugh Piggott" <hugh at scoraigwind.co.uk>
To: <RE-wrenches at topica.com>
Sent: Monday, July 19, 2004 11:54 AM
Subject: Re: 144vdc charging [RE-wrenches]




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At 7:45 AM -0700 18/7/04, Darryl Thayer wrote:
>   I have
>heard that 'excel tec'? makes inverters of Odd
>voltages.

This 144V thing sounds like a 120 volt nominal battery.  If so then
you can go to Exceltech.  I also recommend Power solutions Australia
for high power 120 VDC synch/sine inverters, although they maybe only
do 50 Hz.
http://www.powersolution.com.au/profile.htm

   120 VDC makes a lot of sense for high power systems and I wonder
why it is so rarely seen.
-- 
Hugh

Scoraig Wind Electric
At Enterpriseworks in Ghana
http://www.enterpriseworks.org
http://www.scoraigwind.co.uk/

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