Billboard PV Lighting [RE-wrenches]

[Darryl Thayer]

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Hello to all
Sorry to be slow on response.  
The Billboard lighting is in Minnesota, and it is
cold.  I do not know how to answer the question as to
battery success.  I would think that they must have
frozen in the past 5 years, yet they still work?  On
the first year I took data and still have the record. 
Billboard did not light or at least shut down on
lowvoltage disconnect a few days during the first
winter.  

I have both above ground and burried systems.  The
above ground has be attacked but not breached, the
burried was never attacked.  Both are in locations of
public access.  I would think the burried has a better
enviroment, indeed the burried has continual below
freezing temps but never the extreams.   

When I installed them I believed the AGMs were freeze
tolerent.  I am not so sure anymore, but in this
enviroment they must have frozen and recovered.  

Thanks Daryl  
--- Matt Tritt <solarone at charter.net> wrote:
>   Thanks Darryl,
> 
>   So, now what do you think about your choice?? I've
> been working on a 
> design for a (very) remote aeration system that goes
> into deep-freeze mode 
> for months at a time, so the thought was to do
> something similar - but the 
> oh-so-cold ground has me wondering about batteries
> of any kind. Not to 
> mention the possibility of theft.
> 
>   Matt
>   ----- Original Message ----- 
>   From: "Darryl Thayer" <daryl_solar at yahoo.com>
>   Subject: Re: Billboard PV Lighting [RE-wrenches]
>   Hi Matt
> I used a plastic electrical enclosure with gasket.
> I also insulated the outside with styrofoam.
> 
> The batteries were Concorde AGM. a starved
> electrolite Valve regulated battery.  


		
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