Hi Fred and All, I measured them with a known good meter at
3.53v/cell so use that to calibrate yours. I don't charge them up so safer to
ship.I parallel the 2 48vdc nom sections in a 4 kwh module and charge them with
a MPJA sold hf240w-sf-48. Once you get it, adjust it to 49.2vdc and you
are good. Don't charge over 49.2vdc. I too am looking for more powerful and
reasonably priced solutions that can handle lithium in 48, 96, 120 and 144vdc
packs.I think your 3vdc/cell is too low and I'm using 3.2vdc/cell for now.Would
like to hear others on what voltages the 2013 Volt uses or what they are
using.?And what inverters at a reasonable price one can use to run off the
48vdc EV pack to give V2H?Thanks, Jerry Dycus
From: fred via EV <[email protected]>
To: via EV <[email protected]>
Cc: fred <[email protected]>
Sent: Tuesday, January 30, 2018 6:15 PM
Subject: [EVDL] Leaf module charging recommendations
Thanks to Jerry Dycus for selling me a great looking clean Volt battery module.
My still-working Radio Shack (top of the line) digital multimeter tells me all
the cells are within 0.01 at 3.56 or 3.57 volts.
I've found this useful bit of data:
Number of cells 36
Construction 12 in-series x 3 in parallel
Length 9.5"
Width 9.5"
Height 10.5
Weight 45 lbs
Output terminal M6 nut
Amp Hour 47
Total Voltage 48vdc
CELL SPECIFICATIONS
Cell type Laminate type
Cathode material LiMn2O4 with LiNiO2
Anode material Graphite
Rated capacity (0.3C) 17 Ah
Average voltage 3.8 VDC
Maximum Voltage 4.2VDC
Minimum Voltage 3.0VDC
I measured 42.5vdc across each 12 cell block and the math says it should be
42.72vdc, which is close enough for my meter. It's not 48vdc and from an
earlier discussion I expected that to be the case.
When it comes to charging this battery, I would like to ensure to get the right
stuff. My experience with other lithium based batteries is that the nominal
voltage of the charger is referenced to the battery and in all cases, the
battery voltage is higher than the nominal voltage "listed." That is to say, a
36v battery charges to 42vdc and rarely drops to the 36v reference figure in
regular use. The charger, of course, pushes electrons into the battery at those
higher levels.
In the case of the Volt battery, I believe I would not want to use an
off-the-shelf charger rated for a 48v battery. My search results have all been
ending in devices with excessive top-end termination.
I would like to have an off-the-shelf solution, however, if such a charger
exists. My current collection of chargers are plug-in and go type, in that they
have appropriate profiles for charging to a specific level and tapering off as
appropriate for the pack.
As an additional consideration, this battery does not need to be charged in an
hour or even two or three. I'm amenable to a configuration that requires a ten
hour or longer charge period, especially if cost is lower.
I welcome corrections to my train of thought, even to the point of derailment
as appropriate. I'm hoping for an off-the-shelf solution that works
out-of-the-box or works with appropriate adjustments on the panel or equivalent.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180130/c42b1a2d/attachment.html>
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
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/20180130/da20fd81/attachment.html>
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
