small diesel generator [RE-wrenches]

[Tom Lane, Energy Conservation Services]

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The DC generator feeds all it"s power direct through the inverter  AT the
effiency of the inverter WHILE  excess  power is  charging the
atteries  --- the lousy horrible efficiency of battery chargers in inverters
AND the  horrible efficiency of AC  generators   versus the great affiance
of  DC generators  AND the effiency of  all these wonderful inverters that
are now 90  -to 95  per cent effiency  --- the inverter has made the ac
generator obselete   of course you can use both  ac and dc but the ac
generator will use more than twice the fuel to do the same job be noisy and
much larger and heavier   gator tom---- Original Message ----- 
From: "Hugh Piggott" <hugh at scoraigwind.co.uk>
To: <RE-wrenches at topica.com>
Sent: Thursday, June 17, 2004 4:08 PM
Subject: Re: small diesel generator [RE-wrenches]




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At 9:35 AM -0400 16/6/04, Tom Lane, Energy Conservation Services wrote:
>An AC diesel generator can only recharge the battery storage bank with a
>small charging current and, therefore, has to run a very long time.

At 7:44 PM -0700 16/6/04, Darryl Thayer wrote:
>I like the idea of generators that charge the
>batteries.

Speaking as one who has lived with batteries for the last 25 plus
years, I don't find engine charging of batteries very rewarding.
Fast charging of very discharged batteries in cold weather is
particularly demoralising.  It seems like you burn a lot of fuel and
the batteries give you no thanks at all.

I'd just as soon leave them to stew and run my loads direct off the
engine if I can, and this means a small engine (title of thread)
running on reasonable capacity factor and yes, doing a bit of battery
charge on the side if possible.  I don't run an engine to power my
electric clock but I don't like to see the battery going down and
down for hours after a brief but expensive generator run.  I'd rather
not cycle them like that nowadays I just try to avoid discharging
them where possible.

The logic points to generating low power AC.  I don't believe that AC
generators are so much worse than DC, especially if AC is what you
want in the end. If you want to cycle your batteries, fine, but my
batteries are usually pretty sulky when they get low enough for me to
start a generator and the cycle efficiency is really poor.  If you
want AC then I see no point in generating DC and then feeding it to
the inverter.  I get more useful kWh per gallon by running direct off
AC engine power with a small enough engine to match the loads.

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

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