Cold Batteries [RE-wrenches]

[Steve Willey, Backwoods Solar]

Shunts in series with sensing spread between them may not be accurate.
Notice shunt sensing terminals (for the meter) are on the side of the
blocks, and not on the main power terminals, because voltage losses in the
connections of the large wires can rival those in the calibrated measurement
part of the shunt. Just an opinion, have not tested this, but I think two
shunts in series with meter split across both would have to be strapped
together with very heavy copper, maybe soldered, to be trustworthy over
time.

Steve Willey   www.backwoodssolar.com
Backwoods Solar Electric Systems

----- Original Message -----
From: "Travis Creswell, Ozark Solar" <ozsolar at ipa.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, December 21, 2000 8:20 PM
Subject: Re: Cold Batteries [RE-wrenches]


> Since I am no longer worried about the small fortune of batteries freezing
> in the less than tight box truck I think I will get defensive and snooty.
>
> A hydrometer Windy?  Heck, I can't use the one I've got at 77f  let alone
at
> zero (in the wind).
>
> Wind chill is very much a factor on in animate objects in regards to how
> fast they loose BTU's.  Ya' all leave me alone or I'll get into this shunt
> discussion and tell you why I would do it series!  I have done all kinds
of
> studies on buildings thermal envelopes with utility grade analysis
software.
> (a past life)  Wind speed and direction can be a dramatic factor in how
many
> BTU's you have to put in a building to keep it comfortable.  Also, tell
the
> pipe that broke and froze under the cantilevered part of my house Sunday
> that wind doesn't matter.  It had been that cold before but not that cold
> and WINDY as when the pipe broke.
>
> Soooo there..   I know you are..   but what I am I?
>
> And when did (Slippery)Smitty one of first solar thousandaires get on this
> list?  I thought we were trying to maintain some sort of standard.
>
> Travis
>
>
> ----- Original Message -----
> From: allan <allan at positivenergy.com>
> To: <RE-wrenches at topica.com>
> Sent: Thursday, December 21, 2000 4:30 PM
> Subject: Re: Cold Batteries [RE-wrenches]
>
>
> > Travis,
> >     Did I hear that you needed something to worry about?  I can share
some
> > of mine...
> > Allan
> > -----Original Message-----
> > From: R. Sparks Scott <sharkey at mrsharkey.com>
> > To: RE-wrenches at topica.com <RE-wrenches at topica.com>
> > Date: Thursday, December 21, 2000 12:15 PM
> > Subject: Re: Cold Batteries [RE-wrenches]
> >
> >
> > >>Wind chill? that only applies to heat loss on exposed human skin.
> > >
> > > Agree with Windy on this, wind chill is NOT a factor for inanimate
> > objects.
> > >
> > >>Cold will not increase the self-discharge
> > >
> > > In fact, lower temeratures will decrease the self-discharge, as it
slows
> > >down the local action inside the batteries.
> > >
> > >>Find something else to worry about
> > >
> > > Not a problem, if you don't have something to worry about, your mind
> will
> > >invent something.
> > >
> > > -S
> > >
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>
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>
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>  RE-wrenches-unsubscribe at topica.com
>
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>
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>
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>  michael.welch at homepower.com
>
> ___________________________________________________________
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 http://www.topica.com/lists/RE-wrenches/

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 RE-wrenches-unsubscribe at topica.com

To check out the other RE-Wrench participants:
 www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine: 
 www.homepower.com

For info contact list moderator by email:
 michael.welch at homepower.com

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