[time-nuts] Portable standard

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Apr 6 07:26:11 UTC 2011


In message <BANLkTi=We=7+_yiK4S1yhqAt7ZWU5GA6RA at mail.gmail.com>, Joseph Gray wr
ites:

>Some charge circuits use pulsing current for SLA
>batteries. Would this affect the OCXO?

The only place where charge pulsing has shown an effect is where
you have long strings of batteries (10+) where the pulses help
equalize the charge by overcharging all the batteries, at a heavy
cost in battery lifetime.  A much better solution is electronic
charge equalizers which does the same job without the cost of
battery lifetime.

A simple float-charger will do just fine for what you are trying
to do.

>Obviously too much air flow will be a problem.

Don't underestimate the thermal mass of the SLA batterieies, if
you put them inside the insulation, you will have a much more
stable temperature.

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