mbnvcxz wrote:Hi everyone,
I wonder if you can share your collective experience and tell me whether using a heated seat cover connected to the 12V/cigarette lighter outlet will strain the 12V battery too much?
I have not one but two heated seat covers connected via a two way adaptor that also gives me a USB socket to charge my phone...
If I've understood things correctly, whilst driving (or in 'Ready' mode) the 12V battery is being continuously topped up by the DC-DC converter... does that mean you can draw as much power as you like e.g. with seat heater and not worry? Am I right in thinking the same is true when charging the car (via Type 1 cable and also via CHAdeMO)?
My instinct tells me it might be unwise to use a heated seat cover while parked and not in ready mode (or charging?) as I assume that would be draining the 12V battery.
As Don points out the cigarette socket itself has a maximum current limit - I generally would not try to draw more than 10 amps from a cigarette socket on any car, and even that much can cause quite a bit of heating of the socket if the plug isn't making a good connection, so a good quality plug with spring loaded centre pin is important for high current applications.
While the car is in READY mode, or Chademo or AC charging the DC/DC converter is topping up the 12v battery constantly to about 14.4 volts, under these conditions you cannot run the 12v battery down and effectively it is being powered by the charger or the traction battery.
However when the car is not charging and only in accessory mode (or key on but not READY) the 12v battery is not being charged and the seat cover is running from the 12v battery. If you were to leave this running many hours it would eventually discharge the 12v battery.
A heated seat cover is typically about 3 amps so would discharge a 30Ah battery in about 10 hours. I run my seat cover for up to about 30 minutes with the car not in READY and haven't had any problems, but that's on a recently replaced 12v battery which is nice and healthy. The original 12v battery couldn't manage that and in fact that's what made me first realise the old battery was stuffed!
I have a 2012 Peugeot iOn (bought used earlier this year) and I can't find any evidence that the 12V has ever been replaced, though I'm not certain. So I guess I'm a little wary of working it too hard just in case. Is it true that if the 12V gets too low then you can't charge the main battery (or drive)?
If a 2012 car has the original 12v battery replace it now! Before it lets you down... easy job to replace, here's the one I fitted which is a perfect fit and a higher Ah capacity than the original:https://www.tayna.co.uk/car-batteries/yuasa/ybx5054/
Yes, if the 12v battery discharges too low you will not be be able to "start" the car, nor will you be able to put it onto charge without a "jump start" of the 12v battery to get it started.
I have done a few checks on the 12V battery with a multimeter and here's what I got.
On a coldish day (maybe 5 deg C) when the car had been driven earlier the same day:
12.81V just parked
14.66V in Ready mode
On slightly colder, frosty morning (maybe 0 deg C) when the car had not been driven or charged for around 36 hours:
12.60V just parked
14.74V in Ready mode
Any opinions on the 12V battery's health based on that?
Nope. All that 12.6 volts tells you after the car has been parked for many hours is that the State of Charge of the battery is near 100%. However that could be 100% of a very tiny usable capacity.
Mine also passed that test and was a healthy 12.6 volts the following day however when I tested the capacity after replacing it it was down to about 1Ah from an original 30Ah.......!
Just replace it and then be happy knowing that your heated seat covers won't cause you a problem and that you won't have the 12v battery letting you down any time in the next several years.