Posted by
Phil Kane-2 on
Jul 11, 2007; 8:12pm
URL: http://elecraft.85.s1.nabble.com/battery-backup-etc-for-QRO-K2-tp450109p450115.html
On Wed, 11 Jul 2007 11:22:15 -0700 (PDT), Chris Kantarjiev wrote:
>What have other people set up along these lines? What website
>should I be visiting? Is the "super" powergate really worth
>double the price? :-)
I run my multi-receiver / multi-transceiver station from a 100
AH gel-cell float-charged by an allegedly regulated MFJ 45A
switching supply through an isolation diode (one half of an
automotive dual-battery isolator connected "backwards").
The steady-state load approaches 7A with all receivers and
transceivers in "squelched/receive" mode. The battery bus
(load) voltage is 13.4V which means that the battery is near
the end of its life - it falls to 12.6V under load with the
charger removed. I plan to replace it with a higher capacity
battery bank by the end of the summer.
I would rather set the bus voltage at the recommended 13.8 V
float voltage. The only problem with this is getting the supply
to maintain 14.6V. Right now it's at 14.2V and the isolator
drop is the advertised 0.8V including the 0.2V drop through two
shunts for measuring the battery and load currents.
I hesitate to remove the isolation diode lest the supply
voltage fall below the battery voltage for some reason and
reverse current flows into the supply regulator. That can
happen when "adjusting" the variable voltage output and it
destroyed a linear supply that I had many years ago.
That's how I do it.
--
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
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