The battery load bank tester is normally used for about 15 seconds for battery voltage range from 6 to 180 volts. If my 180 volt pack has a standing voltage of 208 volts at fully charge, it will drop to 192 volts in with 1 second at a initial startup of the EV. A continuous load of 200 amps for about 5 minutes will drop the voltage to about 170 volts. Removing the load from the battery pack the voltage comes up to about 188 volts while driving the EV.
To charge a battery pack at 50% SOC with a 100% SOC battery pack, just connect some type of load or load tester to the 100% SOC battery pack to reduce the voltage, then connect the battery to the one you want to charge and then remove the load bank. Never did a dump charge, but my EV call Transformer I had a 300 amp SCR charger which was a full wave three phase bridge using four 300 amp diodes and two SCR diodes. Can vary the current from 0 to 200 amps or more. Use a Size 4 AC contactor on the AC side fuse with a Limitron 200 fuse. The DC side was fuse with a Limitron 400 amp fuse. This SCR rectifier was direct connected to a large 6 wire AC Power Anderson receptacle that is normally use for aircraft starting. If I pull into a filling station or a welding shop, I had several adapters to plug into any receptacle up to 100 amp or could even had Bussman Company switch board fuse clamps that can clamp right on the AC mains that go to directly to a line transformer. The maximum ampere I charge at a one time, was 200 amps directly from a three phase bank of transformers connected at 250 volt Delta. It took less than 20 minutes to charge battery pack rated at 300 ah after driving 60 miles to the airport and back. The charge ampere drop will drop from 200 to 150 amps in with a minute. As the ampere went below 100 amps, I had the option of switch over to a 100 amp regulated battery charger. Roland -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140421/d392250d/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
