The question is incomplete. Which is the SLA capacity (Ah), which is the current profile through the load ? How it looks the backup (which is the voltage level used for the application) ? Vasile P.S. learned from a previous topic that things are different than you imagine... On 8/2/06, YAP wrote: > 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 > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist