69800
Posts: 143
Joined: Fri Dec 30, 2011 2:21 pm
Delivery Date: 03 Jan 2012
Leaf Number: 16583
Location: North Idaho

Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Tue May 26, 2015 2:48 pm

BrockWI wrote:Two more cases of the 12v aux battery dying. The first one was while the vehicle was on and moving at 50 mph. For those of you that think this isn't a problem, great, then leave those of us who have experienced it first hand to figure out our problems.

viewtopic.php?f=30&t=19767
and
viewtopic.php?f=30&t=19773


For those of you who want to see what a failed 12v battery looks like.... Read BrockWI's links. This would be good to know in an emergency. This is exactly why I keep my 12v battery in tip top shape. An ounce of prevention is worth a pound of cure...
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QueenBee
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Leaf Number: 2062
Location: Bellevue (Seattle), WA

Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Tue May 26, 2015 2:52 pm

69800 wrote:The windshield wiper thing is an eye opener. I am suspecting when the load on the battery is such that the voltage drops to a certain value it kicks the charging voltage up to 14.1. I am going to do a test. I will find something to plug into the cigarette lighter that draws 15 amps. Using a dual port adapter I will have my wife watch the voltage each day with a load on and see if it will stay at 14.1 all day every day. I will report back as soon as I get some data. The other reason it would be nice to force the voltage up is on a dark nite. The halogen high beams lose about 25% of their lumens at 13.1 volt vs 14.1 volt. I could force maximum voltage and then my high beams would be brighter on a dark nite out here in moose and deer country. This would also give my battery a proper charge at the same time. Does anyone off the top of their head have and idea of an auto part device that would draw 10 to 15 amps? I will start the test immediately.


I don't think so. I don't know how quickly the DC->DC responds to loads but it seems to be near instantaneous at increasing and decreasing the amperage it is putting out. I think I would start out by testing to see if you can get the voltage to 14.1 volts through any means other than the known conditions of when the car first starts and when the windshield wipers are on. As for loads to test that turning on your brights/etc. is somewhere in that neighborhood but don't expect that to cause the voltage to change.

lorenfb
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Leaf Number: 416635
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Wed May 27, 2015 9:42 am

QueenBee wrote: As for loads to test that turning on your brights/etc. is somewhere in that neighborhood but don't expect that to cause the voltage to change.


Just turn on the A/C blower to high speed. Most blowers draw 15-20 amps, and with the high beams
the overall current draw should easily approach 30 amps.
Leaf SL MY 9/13: 65K miles, 50 Ahrs, 5.2 miles/kWh (average), L2 charges to 100% > 1000, max battery temp < 95F, min discharge point > 20 Ahrs

QueenBee
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Leaf Number: 2062
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Wed May 27, 2015 10:10 am

So I was day dreaming the other day and was thinking about the day that my 12v finally fails. I have jumper cables but like to be a bit more self reliant than that.

I suppose one solution is carrying around another small 12v battery and remembering to charge it every once in a while. Maybe mounting it somewhere and wiring it to the 12v system with a diode so it stays fully charged.

Then I started thinking about custom DC to DC charger. It would connect to both the 12 volt batteries. When the cars battery was above 12.9 volts it would charge the backup battery using the appropriate charging algorithm for maximum life from the car side which would be being powered by the cars DC-DC. When the cars battery was below 12.9 volts it would charge the cars battery from the aux battery. Then it could monitor the SOC of the backup battery and if that ever got too low you would know that you've used up your reserve capacity, likely because you haven't used the car in too many days.

Or one could just replace the battery early and regularly ;)

BrockWI
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Wed May 27, 2015 10:41 am

I keep a 12v 8 ah SLA battery in the drivers side compartment in the trunk. I have the standard 12v sae plug and a reversing cable with it. In the front I have a sae plug attached to the cars aux battery and snuck out the charge port for trickle charging it weekly. If I need to I can just plug them together and basically parallel them. I have used it more for powering a 12v to USB adapter, but it's nice to know it's there. Again I figure if I have it in there I will never need it, the minute I take it out...

I have in the past used a 12v 250a sla, 2000w inverter and 50 amp charger in place of an alternator in another vehicle :)
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baustin
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Leaf Number: 402162
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Wed May 27, 2015 5:28 pm

I bought this on sale at the end of January for $48. http://smile.amazon.com/gp/product/B000 ... UTF8&psc=1
I was going to keep it on the back porch 'just in case' since the heat is hard on batteries here. I left the blue-tooth OBD device plugged in for a couple days after I got the Leaf, and came out one day to find the battery dead. It now rides around in the back of the Leaf, since I don't trust the battery anymore.
2013 Leaf SV - Cayenne Red - QC Port - LED Headlights

DesertSprings
Posts: 158
Joined: Wed Dec 03, 2014 4:40 pm
Delivery Date: 21 Dec 2014
Leaf Number: 319100
Location: Southern California

Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Fri Dec 04, 2015 4:17 pm

Stupid Question time:
- What is the correct spot to hook the negative terminal of a battery charger to on the 2015? The diagram in the User's Manual is quite small and it is not clear to me where they are indicating is the correct spot for body ground. A photo would be very helpful.

My 2015 is in the shop, for what is likely a bad 12v battery (at least partially). So I will be getting a BatteryMinder or CTEK shortly to maintain the new battery and want to make sure I'm hooking it up correct. (Even if the battery turns out not to be the issue)

LeftieBiker
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Fri Dec 04, 2015 6:02 pm

Looking at the big piece of metal that resembles a valve cover on an ICE, on top of the "stack" in the motor compartment, you can use the bolts that fasten it down - the equivalent of IVE valve cover bolts - as grounding points. The right side, closest to the battery, is best. There should be one or two bolts on that side, below the stack cover, that you can also use.
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RegGuheert
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Sat Dec 05, 2015 9:46 am

After a trickle charge overnight, I observed about 12.88V resting voltage on the 4.5-year-old OEM battery (battery temperature was about 0C). Then I plugged in for a full charge and the 12V charger held the battery at 14.65V during the entire recharge of the main battery, something it rarely ever does. That indicates to me that these 14.XV recharges are NOT triggered by low 12V battery voltage, but rather by something else: perhaps time or number of cycles of some sort.
RegGuheert
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DaveinOlyWA
Posts: 12963
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Leaf Number: 314199
Location: Olympia, WA
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Re: Solutions to 12 Volt Batteries and Chargers Posted Here

Sat Dec 05, 2015 11:03 am

RegGuheert wrote:After a trickle charge overnight, I observed about 12.88V resting voltage on the 4.5-year-old OEM battery (battery temperature was about 0C). Then I plugged in for a full charge and the 12V charger held the battery at 14.65V during the entire recharge of the main battery, something it rarely ever does. That indicates to me that these 14.XV recharges are NOT triggered by low 12V battery voltage, but rather by something else: perhaps time or number of cycles of some sort.



hmmm, what was duration of this? as best as I can figure, I have never seen a charge cycle last more than about an hour and voltage was 14.20ish i think. definitely not 14.65. I think you have pending issues
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