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openvehicles / Open-Vehicle-Android

Android App for OVMS
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possibility of having a more precise soh? #139

Open cyrelec86 opened 2 years ago

cyrelec86 commented 2 years ago

Hello the community I wanted to know if it was possible to have a soh with 2 decimal places? I am doing a study on the degradation of the 40 kw battery of the Léaf and I need a precise soh! do you think it is possible? thank you in advance for your answer 😉

glynhudson commented 1 year ago

I don't think the SOH reading from the BMS is accurate enough to merit two decimal places! The SOH is a rough estimation of a chemical process, it's a very rough estimation at best. I wouldn't even consider looking at even one decimal place. The average SOH over a rolling 12-month period is a better measurement. Here's a 3yr graph of SOH of my 2014 Leaf, now with 90,000 miles.

Screenshot 2023-03-30 00 41 10

dexterbg commented 1 year ago

Correct. Adding decimal places suggests precision and accuracy where there is really none.

If you're interested in the raw value the vehicle provides, you can always do metrics list soh. Some vehicle adapters provide multiple indicators, check their documentation for custom metrics, but the "soh" filter will probably already include them.