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)
