72vdc Battery charging for siren [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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The siren requires lots of current because it accelerates up to speed  
in an inefficient way. It uses a series-wound DC motor, like a car  
starter. As the pitch rises, it is speeding up in what is in effect, a  
long-duration starting surge.

Then they cut the power and let the speed coast down, then apply power  
again to speed it up. The structure is like a centrifugal blower with a  
set of large whistles around it.

Always something to talk about on this group!

You might want to contact BZ products if you need a custom charge  
controller that nobody else wants to make.

Windy



On Aug 2, 2004, at 8:51 PM, Dean T. Newberry wrote:

>
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> Drive Sirens!!
>
> I seem to recall a line from Kurt Vonnegut, maybe Slaughterhouse Five  
> about the air raid siren removed from Berlin, and relocated in the  
> midwest being driven by a  Messerschmitt V12. My guess is the 94A is  
> real, A big sound requires lots of energy, the "referigerator" Altec  
> S1A dual drive bass horns we made for a sound company can accept 2kW  
> each, we put two on each side of an outdoor stage at 8kW total 120V  
> that's 66A. They sounded pretty good at 1/4 mile 90 degrees, the siren  
> has to project farther than that at 360 degrees.
>
> enJoy Life
>
> cul  deant
>
>
>
> Jeremy Rodriguez wrote:
>
>>
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>>
>> Wrenches,
>> I have a request to come up with a system to charge 12-6v batteries  
>> in series, 72vdc, to supply a dc siren motor. They claim the motor  
>> draws 94 amps! Any thoughts?
>>
>> Jeremy
>> All Solar
>>
>> [Non-text portions of this message have been removed]
>>
>> Your free subscription is supported by today's sponsor:
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