Requesting a Cooldown manually through OVMS finally resulted in the car sleeping right after!
Good to hear. Do multiple "Range Mode" cooldowns which works more aggressively than std. mode for faster times as well as for higher ESS temps.
However, for the last three days with ambient temps at 70-75F the car has managed to keep itself at 89F. It seems there might be a flaw in the logic of how/when to achieve the desired battery temp.
I've seen this behavior too in California where temps will be 82+ during the day, but drop to the mid 60's / 70's at night. On a previous battery I didn't care about (knew it was getting swapped out), the pump ran for 3 days continuously since I didn't care to cool it down. If its 90+ degrees outside and you pull inside a 75F garage, the battery does not have any way to remove heat from its core other than dissipating the heat from its shell. Also if you drive the Roadster hard and not granny style, temps will rise substantially in the pack even if it is 75 degrees and will still have the same hot core effect. It takes a while for ambient temps (lower than the ESS) to cool down a heated ESS assembly let alone the coolant moving through it. On very hot day where my ESS temps have risen substantially, I pop the rear trunk to expose the ESS while doing my cooldown. Otherwise the CF trunk acts like an oven door keeping the heat inside for which the cooldown has to work harder and longer to bring down. Also the PEM will be hot, the motor will be hot, and all this heat has no easy way of escaping but rather acting like a heat bubble around the ESS. Always keep an eye on you ESS temps.
What flaw are you talking about? There's no flaw, everything is designed for a reason to act a certain way, whether its to save the battery life, to save the battery capacity, etc.
Here in Texas I will be seeing many hot days so it will be interesting to see how it plays out. In the past I have left the car in Standard Mode but it keeps the battery at 95% full which I don't need. I will experiment with keeping it in Storage Mode while the battery is between 50 and 75% full and see if I can keep the battery temps below 90F.
michael
That is totally wrong, Std. mode charges the pack only to 82-84% SOC not 95%. A full Range mode charge charges the pack up to only 96-98%, again by design to protect the ESS for longevity. SOC is the battery in terms of its real capacity in the same terms as in filling a bucket up with water. If you're looking at the battery icon in Std. Mode on the VMS that's not SOC! That's only telling you how much range you have based upon 15-20% that you won't use on the lower end of the ESS and 15-20% at the top. In relation to capacity, the 100% "full" charge of which your battery representation is showing you in Std. Mode is based upon a full battery that's only using 70% of its total capacity.
I don't understand your experiment/purpose for it in the last sentence. There's no relation there of an idle ESS sitting at that SOC and its heat/cooling temp. An ESS *will* heat up faster when you drive them at a *lower* SOC, but have no effect when sitting idle.