Several of the Jeti controllers have min cutoff voltages below 3 volts per cell, including the Jeti 08. If the 3 volts is a hard limit, everyone with a Jeti controller should trash it and get a different one. Also, if the 3 volts is a hard limit never to exceed, you should add some margin for error in voltage measurement . A rule of thumb is that the measurement error is one-half the scale readibility and assuming the voltage is measured to the nearest 0.1 volt, then the low voltage cutoff limit should be set to 3.05 voltage to ensure the voltage cutoff is 3.05 volts +/- 0.05 90% of the time. Similar margins should be set for the high voltage during charging.