[aprssig] Battery & Charger for APRS Station
noskosteve at yahoo.com
Mon Apr 21 19:48:54 CDT 2008
damn keyboard. I'll try this again.
--- Ray Wells <vk2tv at exemail.com.au> wrote:
> I wonder if you misunderstood the function of the solar charge
> controller? It didn't float the battery at 14.4 or 13.4, they were the
> switch off and switch on limits for charging.
OK. got it. The best charge voltage is still a function of the battery's
construction and the load characteristics. This tells me that you are
describing a current charge with voltage sense limits. That is, indeed, a
I'd still be curious about a comparison between the float and this
> The problem with a 13.8v float charge is that a) the battery is only
> charged to about 85% capacity
This is not my understanding of a float, but I was not in charge (no pun
intended) of battery operations, only listened in and read some about it. A
couple of small SLAs I have recommended, if I recall, 13.6 - 13.8 float.
> Regarding RF pollution from chargers. I had a homebrew 15A/13.8v supply
> of standard design - bridge, big cap, 723 regulator driving external
> pass transistors. This supply produced RFI up to the 6m band and it was
> coming from the bridge rectifier. A 0.1uF disc ceramic across the
> rectifier DC tabs fixed it.
Interesting. I'll drop off this OT thread. Good luck with your APRS digi
backup batteries. (;-)
73, Steve, K9DCI
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