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Archiver > TMG > 2003-06 > 1054861884


From: Richard Brogger <>
Subject: Re: [TMG] Comment on UPS
Date: Thu, 05 Jun 2003 20:11:24 -0500
References: <5.1.1.6.2.20030605131957.00a82ba0@mail.comcast.net><3EDF9EBC.79C20D54@infoave.net> <008001c32ba9$c6a86d20$d7b9fea9@MYRNICE>


myrnice wrote:
>
> If you really want backup, why not get a small generator to provide AC to
> keep the batteries charged for several days if necessary.

Hi Myrnice,

I have two engine driven alternators to charge the batteries during an
extended outage. The little one will give me 40 amps for charging and
the larger, 120 amps. That is why I can get by with just four
batteries.

Now if I would convert the small engine to propane, I could let it run
off of my 500 gallon tank. I might even be able to salvage some of the
waste heat and get double duty from it. <g>

It is strange that you mentioned 750 KW gas turbine driven units. I
used to teach about them. Those used Solar gas turbines from IHC. They
were packaged into a semitrailer sized to fit into a C130 and could be
used as stand alone units or paralleled. To be classed as emergency
generators, the unit had to be able to start and assume full load
within ten seconds. Those gas turbines could do it in about four
seconds. However, they used about 120 gallons of diesel per hour at
full load. That same amount would run an 1500 KW EMD unit for and
hour. The gas turbine units were easy to transport but it did not take
them very long to burn enough extra fuel to equal the weight of an EMD
unit.

Richard Brogger

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