[JackPreacher]

Return trip tonight; 86 miles covered at 60mph (mostly) : stopped at services with 48 miles remaining. Average 4.6mi/kW on the dashboard.

that concludes this saga. Ciao😃

 

[IanL]

What SOH does Spy give?

 

[JackPreacher]

What SOH does Spy give?

It doesn’t show any SOH at the moment or deterioration.

 

[JackPreacher]

 

[IanL]

Fair enough. Perhaps you'd like to have a go with my method?

After charging, reset the m/kWh (shows "--" when reset). Note the mileage and the battery %age if not 100%. At the next charge note the mileage and the battery %age before charging commences and note the m/kWh. Divide the difference in mileages by the m/kWh to get the kWh consumed. Divide this by (difference in %ages x 0.01). This gives the kWh capacity at 100% charge. Divide that by 27 or 30, depending on battery size, and multiply by 100 to get SOH.

In your case, I'm not sure what value to use for the last step, but I think you should assume 27, as it is unlikely that the BMS software has been re-written to recognise the higher capacity of the replacement cells. However, the step before that, the kWh capacity at 100% charge, is what you really want to know.

 

[JackPreacher]

Fair enough. Perhaps you'd like to have a go with my method?

After charging, reset the m/kWh (shows "--" when reset). Note the mileage and the battery %age if not 100%. At the next charge note the mileage and the battery %age before charging commences and note the m/kWh. Divide the difference in mileages by the m/kWh to get the kWh consumed. Divide this by (difference in %ages x 0.01). This gives the kWh capacity at 100% charge. Divide that by 27 or 30, depending on battery size, and multiply by 100 to get SOH.

In your case, I'm not sure what value to use for the last step, but I think you should assume 27, as it is unlikely that the BMS software has been re-written to recognise the higher capacity of the replacement cells. However, the step before that, the kWh capacity at 100% charge, is what you really want to know.

I'll do that next week for sure. Rough calculations suggest around 29kWh at the moment. My usual trip is 151miles each way and I felt the car would easily cover 130 miles, therefore the additional 30 miles or so at a Rapid not only costs a lot less than before the upgrade but also knocks the time spent at a rapid to no more than 15 minutes. Blessed relief.

 

[JackPreacher]

SOH: 111.4% `therefore a quick calculation..... 1.114 x 27kWh = 30kWh

Happy Happy Days

 

[IanL]

Good to hear and very gratifying. In post #74, I estimated 103% of 28.8 = 29.7, so pretty well on the money.