-------- Bob kb8tq writes: >Properly charging batteries is a bit complicated.
With VRLA lead-acids: Not really, constant voltage 2.3V/cell, current limited to $Ah/10 and you're done. For the tonnage of batteries relevant for us, when used indoors, temperature-compensation and all that is not relevant. Charging Lithium on the other hand is several kinds of nightmares, many of them involving unquenchable flames. >One “cute” alternative is to do a battery + boost converter ( = switcher) >instead. >[...] >The advantage of a switcher is obviously efficiency. A fully charged “12V” >LiFePo4 stack could easily be at 14.8V. >Fully discharged it might get down to 10.4V. Allowing for that 1.4:1 output >ratio with a linear regulator means a >lot of (expensive) battery energy goes up in heat …. Yes, for most stuff I would just slap a good isolated DC/DC converter on a single 12V battery and be done with it. But for a BVA I would choose more expensive batteries over switching noise any day... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
