[Elecraft] Elecraft Power supply

[N6JW]

"How much would you be willing to pay" for an internal
uninterruptible PS in the P3?

Let's see: Working from what we already know . . .

Gamma Research HPS-1a is $169

According to Ron AC7AC there is only 4x4x6" space available in the P3, 
so keeping that as a limiting factor, even the following LiFePO4 battery 
pack would fit in:

Powerizer's 12.8v (working; 14.6v peak; 10v cutoff) 9.9aH (127WH at
 21amp) LiFePO4 battery pack (4S3P) 2lbs, 4.3x3.3x3.4"  [since LiFePO4
batteries allow full power operation through more than 95% of its capacity,
this pack would allow for significant operational time at 100w.  Also note
this technologies reputation for safety (no fire or explosion risk), 10+
year
lifespan with thousands of full discharge/charge cycles, and quick recharge
times.]    Current Price = $154  [$139 in quantity] 

Of course, one might not need anything nearly as large as this battery
pack for the intended function!  Powerizer also lists a 6.6aH pack for $75.

So one could reasonably surmise that it should be possible to sell an 
internal P3 PS along the lines suggested for somewhere between $175 to
$350.  At anything like these prices, I would buy it without hesitation.

73

John 
N6JW



WILLIS COOKE-2 wrote:
> 
> How much would you be willing to pay? $300, $500?  
>  Willis 'Cookie' Cooke 
> K5EWJ 
> 
> JOHN SAID
> 
> Elecraft could design a small (RFI 
> quiet) switching PS which would constantly recharge an 
> appropriately sized LiFePO4 battery pack, which in turn would
> supply the power needed by the K3/P3 combo (i.e. 25 amps).
> In effect this would replace the large caps in the HPS-1a 
> design, with the LiPo battery.  Bottom line: a universal voltage
> uninterruptible internal PS.
> 
> I agree, and more to the point -- I would buy one.  
> 
> eric
> VA7DZ
> 
> 
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