The rule of thumb is to over design the system. I have nearly the same system
with a few differences. I don't use a distribution panel, rather my 2x 140
AHr batteries and the solar panel are netted at the
K3 with a 5 Farad cap 12" from the K3. I monitor the voltage at the connector
of the K3 and only see a .1-.2 volt drop from resting to key down. So YES make
all leads HEAVY and short.
Mel, K6KBE
From: George Thornton <[email protected]>
To: Ron D'Eau Claire <[email protected]>; 'Bob Jonas' <[email protected]>;
"[email protected]" <[email protected]>
Sent: Saturday, February 4, 2017 4:17 PM
Subject: Re: [Elecraft] power issues
I did some checking today on my voltage to the K3 using two different routes.
I am using an Astron RS-35m power supply. It was tuned up to output slightly
under 14v. Normally it mediates through a PG40s backup and switching device,
connected to three 140AH backup batteries as well as the power supply.
When I connect the K3 power through the PG40S distribution panel I read 13.3
volts at the K3. This drops significantly when I transmit, going down to under
12 volts.
I then direct-wired the K3 lead to the Astron using ten gauge wire and a
relatively short lead. Power at the K3 then reads 13.8 and drops only to 13.7
during transmit.
Since I had failures attributed to erratic power supply, my conclusion is the
K3 should only be run via a short, large gauge lead direct to a power supply in
good order.
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