Robert Bruninga via EV wrote:
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.
Great idea. I did this years ago, and haven't had a dead 12v battery
since. :-)
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!
You'll probably get about twice the power out of the PV panel with it on
the roof, too. The glass blocks a significant amount of IR, which is
what the PC cells are the most sensitive to.
-----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.
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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
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--
"IC chip performance doubles every 18 months." -- Moore's law
"The speed of software halves every 18 months." -- Gates' law
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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