[Mobile-Portable] Understanding High-Capacitance in DC Supply Chain

[kd4e]

I thought I would continue to share anything valuable in my 
quest to understand
the good, bad, and ugly of "ultracapacitors", 
"supercapacitors", and "hybrids" in a
DC supply chain.

I just found these interesting tid-bits and have parphrased 
them for clarity:

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A 2 farad 0.002 ohm ESR Capacitor could supply a peak of a 
hundred amps with less
than 1V sag for more than 10ms.

A typical "hybrid capacitor" won't do that, perhaps only a 
microsecond, because a
"hybrid" compromises the low-ESR component by paralleling 
higher ESR components.

There are points of failure and 
loss-due-to-resistance/capacitance/inductance along
the whole power supply chain to the amplifier(s) ... e.g.

Alternator -> Battery B+ -> Short length of #4-#00AWG -> 
Fuse or Circuit Breaker ->
10-20 ft. #4-#00AWG -> Distribution Block Input -> Fuse -> 
2-4 ft. #10-#8AWG
(Sometimes #4) -> Amplifier B+Terminal -> [amplifier power 
supply, amplifier circuit,
speaker(s), etc.] -> Amplifier B- Terminal-> 1-2 ft. 
#10-#8AWG (or sometimes bigger) ->
Vehicle's steel body -> 1 ft. #6-4AWG Ground Strap (unless 
upgraded) -> Battery B-

Where the cap is located matters.
The spare charging capacity of the vehicle or AC charger is 
also a factor.

The digital displays are a waste of time as they are too 
slow, by design, to
capture the spikes and dips -- though this could 
thoretically be remedied.
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It appears as though the 0.0016 ESR 2 Farad cap may in-fact 
add value.
There remains a good deal to learn about the rest!


-- 

Thanks! & 73, doc, KD4E
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