[aprssig] backup pwr systems

Dale Blanchard wa7ixk at earthlink.net
Sat Dec 9 18:59:04 CST 2006

A.J. Farmer (AJ3U) wrote:
> Just some food for thought, if you have the battery hooked up to a
> load while you are charging it, this prevents even a "smart" charger
> from properly determining the state of the battery and that is why it
> boils over the battery.  It is not a problem with the charger - the
> charger is designed to charge a battery under little or no load.
I have a Marine charger that is designed to work with light loads or no 
That is what the book says and why.
I have been using it in my Ham station with some radios on 24/7.
Keeps up OK. But it is a $150.00 charger.
It is difficult to find a proper charger due to the snake oil marketing.
If a company does not publish full specs. I will not buy one.
That is why I do not use a  Deltran Battery Tender.
They publish the charge curves, but do not list the voltages.

A cheap charger normally has wide ranging manufacturing tolerence.
Some smart chargers are reverse engineered in China and do not meet the 
origional makers specs.

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