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Post by rusdy on Jun 6, 2020 16:39:33 GMT 11
... as the charge algorithm in the 2011/2012 models is horrible. Indeedy. Sometimes I see the aux battery goes down to high 11s before it starts bulk charging (to 14.4). This is during the car is turned on! I was expecting at least to float charge at all times (13.6) during car turned on. However, since my leaf is regularly used, mine is still on original aux battery since it left the factory. Impressive! Can't say the same thing with the original traction battery 😂
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Post by coulomb on Jun 7, 2020 22:43:31 GMT 11
I will just add that I'm quite surprised at the effect of opening a door (which triggers a bunch of computers to wake up) has on auxiliary battery resting voltage. I just measured over 12.7 V after a long rest, whereas it was just over 12.5 V just after I opened the doors (I foolishly left my multimeter in the glove box after yesterday's measurement before an errand). That makes a huge difference to the apparent state of charge! I'm grateful to poster RegGuheert in this mynissanleaf.com post: Please ensure the following when you make this measurement: 1) ELM327 [OBDII dongle] is not plugged in. 2) You do not open any doors following the charging cycle. In other words, open the [bonnet] before you start charging so that you can measure the voltage without waking up the car electronics. Edit: I meant to add that I guess the large difference in voltage after opening a door is due to a pulse of current temporarily wiping out at least part of the surface charge, and that surface charge appears to be able to re-form over a period of hours. Lead acid batteries are weird things. Edit 2: that means there may have been considerable life left in the original battery, and I basically wasted $200 replacing it a year ago. Sigh.
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Post by tomkauf on Jun 8, 2020 1:19:54 GMT 11
Interesting, that's a bigger voltage drop that I thought. I wonder how much of the drop is because of the interior light. I would've thought the high current draw of a filament bulb would be more than a few computers. But I guess the computers could be fairly energy intensive depending on what they drive. Either turning the interior light to off, or replacing it with an LED (like I did) would confirm it. I just haven't done the measurements.
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leafmedo
EV Enthusiast
Posts: 38
LEAF OWNER?: No
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Post by leafmedo on Jun 8, 2020 21:06:40 GMT 11
I used to have a Leaf 2012 and have the same problem with accessories battery very under charged. I was surprised to discover in the User Manual that for the accessories battery to be topped up automatically, you have to unplugged after a successful charge, this was not practical for overnight charging and morning warm up. What I did to overcome this problem was running a cable (with fuse and socket) from the battery to the charging area and trickle charge the battery with an external 12V charger from there, I only using it if the car is idle for a few days and plugged in.
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