Plug-in battery 4.4kw SOC Values

Hello. Using an aftermarket app or gauge is a great way to learn more about how the system actually operates. There are many things to monitor and a wide variety of conditions which influence output.

In this case, you are seeing the "longevity" range for the SOC (state of charge). The system doesn't allow charging above or discharging below those levels. That charge/usage span is what ensures the longest lifetime for the battery-pack. That's why it last so much longer than other rechargeable devices, like your phone.

 

Yep, that's about right. The system keeps the battery charge between about 20% and 80% to extend the battery service life. That's about 60% of the nominal 4.4 kWh capacity, nearly what you measured during recharge.

 

As the battery ages its capacity is reduced. I only measure the full charge amount occasionally. The largest for a full range charge was 3.1 kWh when the car was new and the most recent measurement was 2.7 kWh. My total miles are just above 20K.

 

SOC range is normal. It takes about 3kWh to fully charge with about 15% loss.

 

Yes, temperature has a lot of impact. In summer you can easily have 30% more EV range than in winter. Part of this difference is because the battery takes more charge then. You can find some data about variation over time within the year and over years here: Electric battery degradation | Page 3 | PriusChat

 

I don't know the exact figures, but there will be some inefficiency in converting the voltage and storing the energy.

 

There is also a hit taken caused by freezing temperatures. Electrical resistance is increased then in lithium chemistries.

 

i didn't realize the voltage changed with charge level.

 

Some do more than others. Quote from this web page Measuring State-of-charge - Battery University

"Each battery chemistry delivers its own unique discharge signature. While voltage-based SoC works reasonably well for a lead acid battery that has rested, the flat discharge curve of nickel- and lithium-based batteries renders the voltage method impracticable."

 

In my 2012 PiP, when I'm at 20% SOC (4 visible battery bars), the battery pack voltage reads 200. This is with no load on the system (A/C is completely off, no headlights, etc). I've seen the battery pack SOC as low as 18% (2 battery bars visible), at which point the ICE kicked in and starting charging the pack. I do not recall the pack voltage at that point. I have seen my battery pack voltage as low as 183 volts while going uphill just after the car exited EV mode and entered HV mode and SOC was 23.1%. I seem to recall that when I've charged the car overnight, my SOC is usually 85% and the battery pack voltage level is 225, but I will confirm that tomorrow morning.

 

SOC this morning was 84.3% and 223 volts.

 

Well SOC for me last time this year was 85.49% and this morning, 85.49%. The data is interesting and graphing it can show some interesting correlations: