Yikes, 190 for a 144 nominal is a pretty high equalizing charge every time....
Sent from my iPhone On Oct 22, 2013, at 1:27 PM, RightHand Engineering <[email protected]> wrote: > Hi Steve,My comment is that the US distributor for Zivan seems to > consistently program the Zivan chargers to be too aggressive when charging > wet PbA batteries. I got an NG5 from them which charged my 144V pack to over > 190V each cycle, and that was in effect doing an EQ charge each cycle. I > checked with the manufacturer of my T-145 batteries (Trojan) and they agreed > that it wasn't good for the batteries. So I went back to the distributor and > asked to have it reprogrammed (for free), but they refused and defended their > charging profile as "good" for the batteries. My batteries were dead within 3 > years, rather than the normal 5 years. I've since replaced my NG5 with a > PFC-30 by Manzanita.-Randywww.evalbum.com/1253 > >> Date: Tue, 22 Oct 2013 11:54:24 -0400 >> From: [email protected] >> To: [email protected] >> Subject: [EVDL] Charge profile on Zivan NG3 for 108V US Battery 125's >> >> 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) >> > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131022/79cfc6fa/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) > _______________________________________________ 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)
