NORTON wrote: ↑
Sun Jan 27, 2019 8:26 am
SparkE wrote: ↑
Sat Jan 26, 2019 5:02 pm
....right after an afternoon full charge (which I rarely did).
But what about allowing the BMS to do its house keeping? I believe that takes place after the 'full charge'.
BMS 'balances' the cell voltages.
But now that I say that,,, how does a Bolt or Leaf or Tesla handle BMS duties when the charge is limited to 80% SOC or the 'Hilltop' setting on the Bolt?
1) I would (purposefully) fill the car up to "full" about once every 6-8 weeks (and leave it plugged in for at least an hour afterwards) so that the car could "top balance" the batteries. I figured that was often enough (since in 2 years I only went under 10 miles range ONCE). To me, that means 'rarely'. (I have already done by 'full charge' for the months of Jan and Feb ...)
2) The Bolt, when using the 'Hilltop' setting, balances at 'full' (which just happens to be at/around 88-89% of full-full
). Basically, 'full' means "when the battery hits a certain voltage that we programmed into the vehicle". When on hilltop, the voltage is simply lower - it still balances the voltage across all cells, just at a lower voltage point. It would probably be a good idea to fill to 'full' 2-4 times a year, but ... Remember that even at 'full', the cells aren't being filled to their theoretical/design max - a 'buffer' is reserved at the top to help with battery longevity. With 'hilltop', that buffer is simply larger.