There is four cells per module. Two cells in series and the two cells are in parallel with the other two cells in the module.
Each cell is rated at 33.3 ah hour. There is 27 modules per battery block. Three modules are parallel in each battery block becomes 27/3 = 9 cells groups per battery blocks. Three battery blocks becomes 3 x 9 = 27 cell groups. There are two pair of cells in each module which is consider as 2 x 27 = 54 each 4.2 volt cells. Therefore 54 x 4.2 = 226.8 volts maximum. The six strings of cells then become 33.3 ah x 6 = 199.8 ah. These batteries are also double - double electrical isolated from the metal frame of the EV. The batteries block set on a steel chassis plate that is on a 1/2 inch insulation board bolted to the bottom of a 1/4 inch thick fiberglass with rubber insert nuts. The outside of the battery box is insulated with 1/4 inch rubberize marine carpet that sets in the bed of the pickup that is also insulated with another layer of marine carpet glue to 1-inch DOW Corning blue foam. When the on board charge is off, the battery is electrically disconnected from the charger and is also electrically disconnected from the motor control system. The PFC-50B charger has a capacitor bank that holds a charge. If you disconnect a link, there could be a arc if not disconnected. Not good for fluid batteries the emits fumes. Also the DC-DC converters are disconnected with the ignition is turn off. The only problem I had with this method, if your 12 volt battery dies, then it cannot turn on the converters. I therefore use a backup unit which is a 12 volt Schummacher Instant Start and a 12 volt Schummacher charger/maintainer which is on while the main power cable is plug into the EV. Roland ----- Original Message ----- From: Jay Summet via EV<mailto:ev@lists.evdl.org> To: ev@lists.evdl.org<mailto:ev@lists.evdl.org> Sent: Thursday, October 01, 2015 11:40 AM Subject: Re: [EVDL] EV pioneers > I now have 45kW of Nissian battery pack in the EV. > Parallel six strings of batteries for 226 volts per string for a total of > 199.8 AH. I'm confused about the number of Leaf modules you have installed. Each module is two cells and around 8 volts (8.4 max) and 60 AH of capacity. 226 volts would be 27-28 modules per string. If each string has 60 AH, I would expect the total of six strings to have 360 AH capacity. (Is the 199.8 Ah capacity just your "usable" capacity? That seems very conservative.) If you have 28 modules per string and 6 strings that would be 168 modules, or 3.5 Leaf batteries, which would be around 84 kW, not 45 kW. 45 kW would be around 1.875 Leaf batteries, or 90 modules. Jay _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> Read EVAngel's EV News at http://evdl.org/evln/<http://evdl.org/evln/> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/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/20151001/37bbbedf/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)
