In standby service, can't you just float the battery on a current limited
constant voltage? Something like an LM317?

Harold


> Hi friends,
>
> I need to use a 12V SLAB for backup purposes in a design. Normally this
> design is powered but on very rare cases power can be out for 1 hour max
> during which the slab should supply power. It can take months between
> these
> power outages. I need s simple (hopefully) circuit to keep the slab fully
> charged. With the long time between outages fast charging is not  needed
> its
> OK if its take a week to charge the battery again after a power outage.
>
> How would the ***simplest possible*** working charger for a scenario like
> this look like?  I have 12V regulated. I have a PIC so I can measure
> current
> and voltage and temperature and do PWM. I also have some space left for a
> charger....  Ideas?
>
> Cheers
> /Ake
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