Below is the charge profile in my charger for a 108V pack if US-125's Im = 13 Amps constant current until voltage hits U1 which is 128.7V
Hold voltage at U1 which is 128.7V until current fades to I2 which is 6.7Amps. Current is held constant at I2 which is 6.7 Amps for T3 which I am a little unclear on, but I believe T3 ends when the voltage hits Um which is 132V (seems very high for a 108V pack, but that is what the data sheet says). Then it floats forever at 119V I believe this profile is overaggressive and damaging the batteries, espicially the part where it goes up to 132V. So, I am looking for some expert opinions as to if this is too aggressive. Also, I plan to monitor the voltage and pull the plug at a certain point. I believe I should terminate the charge somewhere around 130V, so I know it is at least 80% charged. Then literally plug it back in, which I believe will go straight to the float charge. This would essentially skip step 3 of the charge cycle. Does anyone know if I can actually do this and the charger will behave as I am thinking it will? If the pack is >80% charged when I unplug, wait a few minutes, and plug back in, will it go straight to float charge mode? I would think it should as a safety precaution so as not to overcharge the pack in case of a power outage (which is what I am simulating). I know other smart chargers go straight to float if they are near 80%, but the NG3 manual doesn't say anything about this. Also, is there a way to fake out the temp sensor to trick it into charging to a lower threshold? That was my other idea. Or, send it back and tell them I need it programmed for small AGM batteries instead of these big flooded batteries. Thanks, Steve -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131022/f0b47acd/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)
