Do not use off the shelf battery chargers, commonly found at Wal-Mart.
These are SMPS conviently located with a 600kHz operating frequency.
Try an LM-317 set as a constant current regulator to trickle the
battery with C/100, Say 1 Amp for a typical Deep Cycle marine battery.
A common wall wart should be able to be modified for this purpose
nicely.
Then I would use a 120V coil relay with 20A contact to switch to the
battery on AC loss, and a big 68,000uF Cap on the line going off to
the repeater to sustain DC during relay switch time.
On 4/17/06, Lee Williams <[EMAIL PROTECTED]> wrote:
> I am now in charge of some club repeater sites which use the standard
> Micor power supply. These have back-up batteries on them which are being
> boiled dry by the 14.9V the power supply delivers,these supplies are not
> the battery back-up versions. I am looking for a good solution to solve
> this problem,maybe someone else has been there,done that??? Are there
> adjustments to set the voltage on these beasts? I thought about a
> relay,some big diodes,but it looks ugly... 73,Lee
>
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> Yahoo! Groups Links
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