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WB4IUY > TECH 27.03.06 23:13l 52 Lines 3104 Bytes #999 (0) @ WW
BID : 2023_WB4IUY
Read: GUEST DJ9UI DL1LCA
Subj: Parallel Batteries
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0ACC<DB0GOS<DB0RES<ON0AR<N9ZZK<CT1EJC<
CX2SA<KD4KVG<W4RAL<WB4IUY
Sent: 060327/1345 2023@WB4IUY.#rtp.nc.usa.noam
I must agree with Neil ZL1ANM.. I have repeaters and packet node sites with
batteries running in a common configuration. Several years ago, I removed all
of the isolation diodes, regulator modules, etc. These devices were driving me
nuts every time a rig would take lightning damage or internal failures, as
well as problems associated with voltage drop across these isolators. At a
repeater site, sometimes one can have 50+ amps of continuous current draw
when several repeaters are transmitting, and this requires large heat sinks
for the diodes or regulators. We even resorted to soloar charging for small
blowers to keep the devices cool. I finally tired of all this and decided to
do some empherical testing of my own.
Somewhere around 1994, I tied a batch of batteries at one of my site
together. There were 4 _large_ tank batteries, charged by a conventional high
current automotive charger. After 4 years, these batteries were still in
decent condition. I moved on to another site, and connected all of them
together, with no problems. Over the years I notice no difference in battery
live by connecting them in this manner...not better, not worse. I finally
set up all repeater and node sites for full time battery power, and eliminated
most all of the conventional DC power supplies... I only use banks of parallel
batteries w/battery chargers. It has significantly reduced my repeater and
node site maintenance and operating cost.
For 10 years, I've had my entire ham shack (lots of gear, you can see it
online at www.2vulcans.net) running full time on a bank of 4 automotive
batteries in parallel, with no fancy isolators or balancers. I finally
replaced the batteries this past summer... all batteries were 9 YEARS old,
with no problems.
At times I've had as many as 24 batteries (6 sites) connected in this manner,
and have _never_ had and problems. It simply costs me less $$ in this
configuration. I still read all of the stuff I see in rags and oline
about this topic, but I have real-world experience that suggests while
there may be a great technical reason for isolating, there's no significant
reason for the hobbiest to bother with the aggrivation of isolation
systems.
Just my $.01 worth :-)
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º °°°°°°°°°°°°°°°°°°°° WB4IUY Dave Youngsville NC USA FM05 º
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