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Ctek charger getting hot

bigporker

bigporker

PCGB Member
Member
Hi, I have given up trying to use the 12V in the passenger footwell to charge the battery and I have directly connected the Ctek charger in the engine bay. It appears to be connected correctly, the correct lights are illuminated however the charger is getting very hot. None of the chargers on my other cars get hot. Anyone else experience this? Thanks
 
I cannot say that I have ever noticed my CTEK charger getting hot; warm, yes, but not hot. I do connect mine via the footwell socket but cannot see that making any difference. Are you saying that the same charger connected to a different car does not get hot? That said, it may be simply that it is delivering max current (if battery low) and that would make it much warmer than if it were simply in maintenance mode.

As an aside, have you connected the negative terminal of the charger to the negative battery terminal or to the chassis? I cannot see why it would make any great difference but connecting to the -ve post rather than chassis means the the BMS can become confused regarding the battery state; it seems good practice with modern cars with BMS is to connect negative to chassis.
 
Thanks for the reply. Yes I have used the same charger on a different car and it did not get hot. I think you may be right that it might not have been delivering max current on the other cars. I will see what happens when it goes into maintenance mode.

I have connected to the negative point on the chassis that is advised in the manual and on other posts on this forum.

Once it is fully charged I might have another go at using the footwell socket.



 
bigporker said:
Thanks for the reply. Yes I have used the same charger on a different car and it did not get hot. I think you may be right that it might not have been delivering max current on the other cars. I will see what happens when it goes into maintenance mode.

I have connected to the negative point on the chassis that is advised in the manual and on other posts on this forum.

Once it is fully charged I might have another go at using the footwell socket.
Click to expand...
One crazy thing to note is that if the battery is low (not sure how low it needs to be), then charging via footwell socket does not work - crazy but true. My battery went flat for no apparent reason (being investigated by OPC) and I attempted to charge via footwell. Charging via footwell failed. I suspect that when the battery is too low, it has insufficient juice to energise the electronics that keep the footwell socket active for charging. So, my experience is that if battery is very low, you have to charge battery via direct connection. Of course, if the battery is totally flat, this may also mean getting the frunk open using the emergency frunk opening procedure, which, of course, requires the use of a charged battery to accomplish.
 
Pleased to report that you were correct. Now the 5th light is on the charger is just warm.
It is crazy but I think that may explain my inconsistent success with the footwell socket.
Great help. Thank you all.
 
I went through the flat battery scenario
several times before establishing a regime of leaving the car on charge if not used for 4 or more days especially since the drain is quite high over winter
Following Clive’s plug in procedure I am finding the footwell socket works well
and allows the lithium charger to be left
undernmeath the car with car locked
I don’t have a garage
 
It is bonkers how much energy these cars use when idle; my 997 (pretty basic tech compared to 991/992) was the same. I too keep on CTEK when not going to be used for a few days. Bizarrely, the Porsche manual claims it will be happy for 4 weeks, which, we all know is nonsense. Meanwhile, my Discovery sits on the drive for weeks at a time without issue.
 
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