> >then 13.8V would be more or less right for NZ's 10-20C
> >temperature range. However, I think I'll trim them back

> Probably not a good idea either.
> The backup battery in the bell box is charged from the
> 13.8V through a diode,  In all the alarm systems I have
> seen
>
> Peter Cousens

13.8V is what I commonly see too (with and without a
diode). Referring here again

http://www.stealth316.com/2-dynabatt.htm

they say that actual battery temperature is the biggest
factor affecting battery service life. I wonder then if it's
worth using a tempco or spending a lot of time working
out a set float voltage value if 1% or 2% variation in said
float voltage might in the long term make not make a
scrap of difference in variable ambient temperatures

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