Over the period of days after this Shutdown Announcement, idle battery drain is eating my brain. Main reason is that energy is simply being wasted when we DO NOT shutdown. Being Green man is most walks of my life I am genuinely concerned.
Considering one does not shutdown his vehicle, I tried to analyze this scenario with some assumption. In below calculation, only ‘idle’ scenario is considered as it is a pain point.
In above graph, 450 is charged to 100% SoC. If the vehicle is not used or even if it is used sparingly, battery drains and reaches 50% SoC in 8 days, considering conservative drain percentage of 7% a day.
Now lets take a fact that 450’s battery has a total life span of 3000 DoD (Depth of Discharge).
Above assumption is based on this post.. Considering battery is charged and discharged daily basis, battery will reach 70% of its capacity in 3 years. i.e. again conservative case of 300 DoD per year, 900 DoD for 3 years, 1800 DoD for 6 years and 2700 DoD for 9 years and 3000 DoD for 10 years (all considering linear scale)
Now, let us go back to our IDLE discharge calculation
- 8 days to reach 50% SoC, in other words 0.5 DoD is simply lost
- So, in 365 days, 22.8 DoD is lost
- In 3 years, 68.4
- In 6 years, 136.8
- In 9 years, 205.2
- in 10 years 228 DoD is lost.
In other words, 7.6% (228/3000) DoD of life of battery is simply lost in IDLE state. It simply means, we could pull at least 1 to 2 years more if the idle drain is less or zero.
So, Isn’t it worth to shutdown our 450 when it is not in use?