small diesel generator [RE-wrenches]

[Tom Lane, Energy Conservation Services]

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What you don't seem to get is that the D.C. generator could work without
batteries with a direct attachment to the positive and negative cables from
the inverter.  Most of the time, the D.C. generator is working, is when
there is a need for power AND the D.C. power will pass straight through the
inverter at the efficiency of the inverter.  ONLY the power that is not
being used by the inverter is going into the batteries.  The D.C.
generators' efficiency is much higher than the A.C.  The inverter's
efficiency in taking the direct DC power and delivering  it though the
inverter to the load is far more efficient than going through a battery
charger in the inverter. This combined with the AC generator's 50 to 60%
efficiency is the difference.  There seems to be an assumption that the DC
power is not delivered directly through the inverter, but has to go into the
battery bank first.
----- Original Message ----- 
From: "Hugh Piggott" <hugh at scoraigwind.co.uk>
To: <RE-wrenches at topica.com>
Sent: Friday, June 18, 2004 3:48 PM
Subject: Re: small diesel generator [RE-wrenches]




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At 4:51 PM -0400 17/6/04, Tom Lane, Energy Conservation Services wrote:

>--- the inverter has made the ac
>generator obselete

I don't think we are communicating here but I'll give it just one last shot.

If you want to use AC (m0st do now), and your have no renewable
energy producing DC, then it makes more sense to me to generate AC
from fuel than to generate DC and convert to chemicals in the battery
and convert it back to DC and then convert by inverter to AC, no
matter how super the efficiency of each stage may be.  I really don't
think there is any point in batteries playing a major part in the
process.  Better to use a small generator and produce the AC you
need.  Charge the battery with the surplus but don't expect to get
much back from the process if the batteries are down and out.

There we go - three times is enough.  :-))

over and out
-- 
Hugh
Scoraig Wind Electric
http://www.scoraigwind.co.uk/

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