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Danny Sauer wrote:

>R. wrote regarding 'Re: [EE] Semi-Trailer Battery Power Filtering' on Tue, Nov 15 at 16:20:
>  
>
>>Shawn Mulligan wrote:
>>    
>>
>>>Thanks Larry.
>>>
>>>------
>>>nasty environment. Spikes and long term surges caused by all sorts of
>>>things like use of air brakes, 
>>>------
>>>
>>>      
>>>
>>How do you figure use of air brakes is going to cause an electrical 
>>spike?  The only electrical I know of involved is the brake lights and I 
>>doubt the will do much spiking.  even the compressor cycling on and off 
>>is done with a non electrical  air switch.
>>    
>>
>
>That air compressor may be switched on by an air pressure switch, but
>it's usually an electric motor.  
>
The air compressor is driven by the diesel motor usually by direct gear 
drive.  The total air brake system  is designed to work with total 
electrical failure.  It is a total pneumatic system. except for the 
brake lights and other warning light


>Those lights draw a fair amount of
>power too, then there's the CB, the gauges, the headlights (flash to pass,
>anyone?), a starter, an air conditioner compressor, possibly a large
>air conditioner on a trailer, electric fans, etc.
>
>The electric cooling fan(s) and HVAC fan would probably be the biggest
>concerns, since the engine cooling fan(s) will be kicking on and off
>periodically.  The fan in my car, for example, pulls between 25 and 40
>amps, depending on the operating speed.  I'm running a 100 amp
>alternator and the headlights still dim when the A/C compressor comes
>on, activating both cooling fans at full speed...
>
>--Danny
>  
>

I am sure there are plenty  of other things in the system to cause 
spikes and variences.

What about this thought


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