My wife, kd5txd has a k2/100 with a small battery pack backup system at her
desk. It is homemade with 2x, 12v, 7.2AH, lead acid batteries in parallel
with a 1-2A trickle charger. She normally runs about 90 watts output power
on the k2 and has used this power set up as net control for as long as about
an hour, doing ubstantial SSB transmitting. Lead acid batteries are rated
at 7.2 AH assuming either 10hr or 20hr discharge. Discharging at a faster
rate will degrade the AH rating to some extent so that a 7.2AH battery rated
for discharging 0.72 A over 10 hours will not deliver 7.2 Amps for the a
whole hour or 3.6 Amps for a full 2 hours. Note that 90 Watts SSB is much
lower average power than 90 watts of rtty or cw where it is transmitting
full power and drawing full current.
Since we already have two battery systems, the small 14.4AH unit mentioned
above and a 100AH deep discharge battery with 50Watt solar panel, we are not
likely to get another system soon. If we were, I'd be inclined to get the
larger quickstart unit from WalMart or something similar.
That unit offers a 19AH battery along with light, battery booster cables and
I believe two 12v accessory plugs.
best regards,
Charles
wb5izd
> 17. K2/100 Portable Battery Pak Question (Gottlieb, Jonathan)
> Message: 17
> Date: Tue, 2 Aug 2005 13:28:32 -0400
> From: "Gottlieb, Jonathan" <
[hidden email]>
> Subject: [Elecraft] K2/100 Portable Battery Pak Question
> To: <
[hidden email]>
> Message-ID:
> <
[hidden email]>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Does anybody have any experience using the HFProjects Power-Pak with a
K2/100? It is a nice 12v 7ah gel cell with built in trickle charger
(www.hfprojects.com). I wouldn't expect it to power the K2/100 at full 100
Watts, but I'm thinking it would be a good way to have a nice power supply
for camping or traveling and run the k2/100 at 35-50 watts. Please let me
know if anybody has used this successfully.
>
> Jonathan Gottlieb
> WA3WDK
> k2/100 #4856
>
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