Get a fairly large AGM type unit, say 60 to 80 amp-hours or thereabouts,
and charge it slowly with a 1 to 2-amp charger. There will be almost no
chance of overcharging the battery, and no chance whatsoever of a spill.
It will run the K3 for at least 24 hours of normal intermittent
operation (10% transmit, 90% receive) in the event of an emergency.
Since it will charge from regular mains power, you don't care if it
takes 2 or 3 days to recharge, and the charger can build up the battery
while you are asleep. For absolute safety against spills, put the
battery into a large plastic tub instead of directly onto the floor. An
amazingly small charger will keep the battery up if your operate time is
typical of most hams, that is to say just a few hours of actual "on-air"
time a week.
- Jim, KL7CC
On 11/27/2012 6:47 PM, Jim Miller wrote:
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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