[Elecraft] Battery back-up system for multiple rigs

[ke4rg at arrl.net]

I use the Astron BB-30M for shack and RV.  This is the 30A version, but they
make larger.  Attach minimum 33.6 Amp 13.8 V supply, your SLA battery(ies),
and your load.  (33.6 Amps is max load plus charging current.)  The
controller will switch immediately to battery if the power supply DC goes
away.  During heavy loads the power supply and battery will combine for
greater output.  And of course the controller keeps battery charged.  If
your batteries are flooded lead acid this is NOT the solution.  Flooded lead
acid batteries require a three level charger.

I worked many years for firms that designed, manufactured, and installed
equipment requiring heavy battery backup.  We NEVER attempted to isolate the
batteries from each other.  We did always install new batteries of same
technology (FLA, AGM, Gel) and manufacture.  In fact, my house emergency
power is a Trace inverter powered by 12 80AH AGM batteries in
series/parallel (48volt).  They have been operating flawlessly for 8 years
now.

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of N2TK,
Tony
Sent: Thursday, January 22, 2015 2:48 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Battery back-up system for multiple rigs

Looking for some advice. Trying to help out a friend who is setting up an
emergency communications system for the Hams in their condo group.

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