The float voltage is 13.5 to 13.8 volts. That is what you would expect
to see on the battery terminals when the car has been running for
awhile. Charging begins at about 13 volts, BTW. All these voltages are
at 25 Celsius. Colder means higher charging voltage (and float voltage.)
Hotter means lower charging voltage, and of course float voltage.
However, there is some distance and more than a few connections between
the battery and the cigar lighter. There is certainly voltage drop along
the way. Even so, I would be slightly concerned if I read 13.0 volts on
the cigar outlet. A bit toward the low side when the car has been running...
Mark would be wiser to use the app "Leaf Spy" through the OBD connector
to find out what the accessory system voltage is. At least what the car
ECU is getting.
Bill D.
On 3/29/2022 12:59 AM, paul dove via EV wrote:
The minimum charging voltage is 13.8 volts dc across the battery terminals, or
at the output of the alternator. A single lead-acid cell starts to charge at
anything over 2.25 volts. Since a 12 volt battery has six cells, any 12 volt
lead-acid battery needs at least 13.8 volts to start to charge.
Sent from AT&T Yahoo Mail for iPhone
On Sunday, March 27, 2022, 9:15 AM, mark hanson via EV <ev@lists.evdl.org>
wrote:
Hi Folks,
I checked the 12V aux voltage through the cigarette lighter socket with a
DVM and shows 13.0V during operation. The low voltage storage codes over
time were caused by the vehicle sitting a long time and the ghost loads
dropping the battery voltage to 10V and had to recharge externally (also
sets low voltage codes when replacing the battery). I don't see *how* the
aux voltage operating at 13V has *any* effect on the brakes in *cold*
weather. I'd love to see a technical explanation on this rather than "just
replace the good battery with a more expensive one".
Best regards,
Mark
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