I'm so fed up with 12v batteries I finally today drilled a hole in the roof right over the dome light and mounted a solar panel up there where I could reach the wires and coathanger them over to the pillar and down to the stupid 12v battery.
Solar panel on the dash just was NOT working. AFTER doing all this, I found out why. The blocking diode to prevent night time discharge back through the panel happened to be touching the wire such that it was bypassed. Oh well. Now it will work! Bob -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Thos True via EV Subject: Re: [EVDL] Dead accessory battery (was: Shock and Awe - Historic run 9.589 Seconds @ 152 MPH!!!) Hi Bill, I have to heartily agree that the dead accessory battery happens to everyone at one time or another (Murphy dictates how difficult the timing will be). I recall that we developed the habit of having at least one back up battery just for such a situation. We usually had a couple of the Hawker Genesis batteries on hand for replacements on Father Time's drag bikes, so it wasn't too inconvenient after the first time. -Tom True On Sun, Jun 5, 2016 at 3:04 PM, Bill Dube via EV <[email protected]> wrote: > A dead 12 volt accessory battery has happened at one point or another > to everyone. > > We typically run a small DC-to-DC converter to keep the accessory > battery topped up, just to avoid the dreaded flat accessory battery. > You absolutely _must_ have a 12 volt accessory battery, but a DC-DC > that runs whenever the vehicle is "on" increases the reliability a great deal. > Small expense, but is good insurance against forgetting to charge the > 12 volt, which is easy to forget in the excitement of race day. (Ask > me how I know. :-) ) > > We use a Vicor DC-DC converter module (or more than one in parallel) > like this one: > http://www.ebay.com/itm/201199082834 > You might choose a different model, (like a VE-j72-CY) depending on > your main pack voltage and your wattage needs. You should get a 15 > volt output and trim it down to ~13.5 volts (read the data sheet). If > you get one with > 12 volt output, it won't charge a 12 volt battery because it really > puts out exactly 12.0 volts. > > I don't know who originally said it but, "To finish first, one must > first finish." > > I'm guessing, but you probably used a portable "12 volt" battery > charger to recharge your Li-Ion "12 volt" accessory battery. That is > likely what ruined it. Almost without exception, the open circuit > voltage of all portable "12 volt battery chargers" is greater than 15 > volts, (often as high as 17 volts) which is a death sentence for a "12 volt" Li-Ion pack. > Always measure the open circuit voltage, with a voltmeter, on a > battery charger before you use it to charge a Li-Ion battery. Any > power supply or charger that put out over ~14.7 volts open circuit > will toast a Li-Ion accessory battery. Find one, like a laptop power > supply, that puts out the _correct_ voltage. > > Also, leaving a switch on overnight accidentally will drain the > accessory battery to zero, which will also result in the demise of a > 12 volt Li_ion accessory battery. Good to have an LED tail light or > dash indicator light that lets everyone know that the 12 volts is "on". > > Best of luck! > > Bill D. > > On 6/5/2016 1:20 PM, Casey Mynott via EV wrote: > >> Hey all! >> >> A historic day for the Shock and Awe racing team from Bothell >> Washington and the world of drag racing! >> >> After sitting in gridlock and sweltering heat on the #1 towards >> Mission Raceway, I arrived just as the track was doing lunch. All in >> all it was an amazing day with some serious excitement (a 9.589 >> second 152 MPH run) and a bit of a turn at the end of the day. During >> run #2 the 16 volt AGM (which was changed out for a faltering 16v >> lithium pack of headway cells) ran out just as the team was pulling >> up to the line. So, yesterday ended in a somber moment of reflection. >> A good reminder, racing is a tough sport, physically, mentally, >> emotionally, financially, all of the above! >> >> The team is at the track today hoping to get in another run, >> depending on how that goes possibly a second. >> >> For now, enjoy the video! :) >> >> >> https://www.youtube.com/watch?v=L53JTDnmj_w >> >> >> Cheers! >> >> Casey >> >> -- >> View this message in context: >> http://electric-vehicle-discussion-list.413529.n4.nabble.com/Shock-an >> d-Awe-Historic-run-9-589-Seconds-152-MPH-tp4682360.html >> Sent from the Electric Vehicle Discussion List mailing list archive >> at Nabble.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) >> >> >> > _______________________________________________ > 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) > > -- Remember, it is not that the glass is half empty, in reality, the glass is merely twice the size that it needs to be! -TNT'82 -------------- next part -------------- An HTML attachment was scrubbed... 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