Wind controller for Batts [RE-wrenches]

[sunwise]

Thanks Hugh,

BTW, I should have added one of those :) things at the end of that
message.

Kurt Nelson

-----Original Message-----
From: Hugh Piggott [mailto:hugh at scoraigwind.co.uk] 
Sent: Wednesday, March 05, 2003 2:11 AM
To: RE-wrenches at topica.com
Subject: Re: Wind controller for Batts [RE-wrenches]

>Greetings all,
>
>Can anyone tell me if the Trace C-60 CC does three stage "charge
>control" when used as a diversion regulator in a wind system?

The Trace C- series controllers have the same charging parameters 
when used in diversion load control as they do in PV control mode. 
However the charging voltage set-points are not adhered to very 
accurately in gusty conditions.  The controller has a time lag in its 
response.  The lag is about 5-10 seconds.  Threfore the voltage can 
swing by 5% or more.  In the extreme case this can cause the inverter 
to trip on over-volts.
>
>
>It sometimes seems like the difference between PV people/manufacturers
>and Wind folks/manufacturers is that PV people design systems around
the
>battery to maximize battery performance and life service, while wind
>folks consider batteries to be little more than a necessary nuisance.

PV is a much more predictable and constant source than wind.  Systems 
are designed with very careful load analysis so as to match the 
supply and demand.  Wind systems by contrast typically suffer a 
'feast and famine' cycle whereby there are times where it is 
appropriate to be profligate with energy (and the battery can easily 
be equalised) and other times where it may be appropriate to test the 
deep cycle capability of the battery to a greater extent  than would 
be prudent on a weekly basis.

It is much harder to say 'what you can run' off a wind system because 
no two years are the same.  And no site can be accurately assessed. 
And accurate performance data is scant in any case.


>We install these really nice, smart CC's for PV like the Solar Boost
50,
>and along comes the addition of a wind generator and the whole battery
>gets stupid.


The charge controllers supplied with wind turbines are not usually as 
sophisticated as the Trace C-series, but at least they operate at a 
stable voltage instead of lagging behind the action like the Trace.

-- 
Hugh

***Next SEI self-build windpower course is at Guemes Island in
Washington
April 14-19: Homebuilt Wind Generators with Hugh Piggott***
hugh at scoraigwind.co.uk
http://www.scoraigwind.co.uk/

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