[Elecraft] [K3} AGM Battery recommendation for K3

[Wes Stewart]

Jim,

I can tell you what I'm very successfully using.

I have a Deka 95AH AGM battery that is on continuous charge via a homebrew 25A "smart charger".  I also have a boost regulator to keep the supply voltage up to minimize TX IMD, even when the battery voltage is dropping during a power outage.

The charger uses a modified Astron 35A supply to provide the raw DC and pass transistors.  A slightly modified A&A Engineering card delivers the "smarts".  Contrary to what some in this forum will tell you, this combination will not overcharge the battery, but will keep it fully charged even while transmitting at 100W, even during an RTTY contest.

My battery sits on the floor under the operating desk.

Wes

--- On Tue, 11/27/12, Jim Miller <jim at jtmiller.com> wrote:

From: Jim Miller <jim at jtmiller.com>
Subject: [Elecraft] [K3} AGM Battery recommendation for K3
To: "Elecraft Reflector" <elecraft at mailman.qth.net>
Date: Tuesday, November 27, 2012, 8:47 PM

I've decided I might get a battery for my K3 for occasional operation
to chase QRM issues. As long as I'm getting it for reception I thought
I might consider one which would prove useful for transmitting as
well.

My "shack" is in the living area of our house with hardwood floors. I
wouldn't be happy with an acid spill there. So I'm looking for battery
size and type information and what sort of operating time I might
expect with QRP and 100W levels (and anything in between...).

Also would like some recommendations for practical handling and
charging to avoid "issues." Charging would be from the AC line. No
solar planned.

I'm pretty sure an AGM deep cycle battery is what I've seen
recommended. What else should I look for?

All recommendations welcome.

73

Jim ab3cv
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