> spring-wound bathroom timer ... works fine for AC or DC ...15-20 amps.
Reminder: But ONLY AT LOW VOLTAGE DC. Use it once at any higher voltage on DC, and when the contacts open, and arc will not only burn it up, but probably catch it on fire. Solution of course is to put a snubber resistor and capacitor across the contacts. But without that, it will not open a HVDC circuit,... just arc and burn. I think this thread is about individual cell modules, so low voltage. But I had to remind everyone not to take that above sentence out of context. Bob On Wed, Nov 4, 2015 at 9:19 PM, Lee Hart via EV <[email protected]> wrote: > Mike Beem via EV wrote: > >> I have been trying to re-balance my 4 year old 100Ah CALB pack with >> mini-BMS... I don't have any other suitable DC lamps or other safe >> (to me) items which I can guarantee won't damage a cell by my >> inattention... What suggestions do people have for me? >> > > A couple things come to mind: > > First, you can get a spring-wound bathroom fan timer (Intermatic is one > brand). They are sold at Home Depot, Menards, etc. for $15 or so. It > installs in a normal electrical box like a light switch. It uses no power, > and so works fine for AC or DC to switch loads up to 15-20 amps. > > Use it to switch your lamp or other resistive load across a cell or > battery. The knob usually goes from 0-60 minutes (though 0-4 hour and 0-12 > hour versions are also available). It will automatically shut off the load > even if you forget! There are versions that have a "continuous on" position > at the end, and versions that don't -- for this application you want the > kind that don't. And it doesn't need AC power, and there are no batteries > to go dead. > > Another option is to put a string of ordinary silicon diodes in series > with your lamp or resistive load. Each diode drops about 0.6v-0.8v at its > rated current, and essentially stop conducting below 0.5v. So a string of > (say) 6 diodes automatically removes the load when the cell goes below 6 x > 0.5v = 3.0 volts. > > -- > Any intelligent fool can make things bigger, more complex, and more > violent. It takes a touch of genius, and a lot of courage, to move > in the opposite direction. -- Albert Einstein > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20151105/9b9b54c8/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
