I experiment some time ago with two on board 12 volt charging systems for my accessory battery. One is a Honey Well Motor Generator that is run off the main battery pack with a voltage output of 14.5 vdc. Another one is a Delco invertor-alternator run off the pilot shaft of the main motor and set at 14.0 vdc.
The reason is that the Generator or my DC-DC converter which I am using now is set at a lower than the other charging unit, is that the converter will go off line when the alternator comes up to the excitation rpm 1100 rpm. The alternator voltage being higher than the DC-DC converter, the converter current drops as the alternator current raises. To see what happens if I set the voltage at 14.5 volts for both charger, one charger will charge at a lower rate than the other because the output voltages are not exactly the same because one charger reaches the cut out charging rate before the other one does. I purposely set my onboard charger voltage to different voltage outputs, because when I let up on the accelerator on a down hill run, the alternator current is setup higher providing a load on the motor which acts like regenerative braking. The DC-DC converters go off line at this time and the main motor ampere meters are reading zero and the alternator is providing from 30 to 100 amperes. You will find that if one charger reaches the cutoff voltage, One charger will continue to charge while the other one will drop off. Roland ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Friday, March 22, 2013 6:08 AM Subject: [EVDL] two chargers in parallel > > > Good morning, I am going to run two Zivan NG3's in parallel. Seems to be > pretty straight forward. My pack is made of 60 Sky Energy, 100ahr cells. > Charger #1 is set to U1 @ 216vdc and float @ 207vdc. I had charger #2 > programmed to U1 @ 210vdc and float @ 201vdc. This is to get the main > charge up to 210vdc with both and let Charger #1 finish and balance. Are > there any concerns that I should be aware? > > > > Thank you, Al Swackhammer www.evalbum.com/2430 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130322/d4342336/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)
