I'm trying to determine why I am seeing a voltage overshoot of 19 to 20 volts in my 12v setup. It is a simple off-grid system with 1000 watts of solar, a Makeskyblue v119 60-amp charge controller and a 4S-100ah Lifepo4 battery with a 100a Daly smart BMS (common port). The only load device is a 12v Reliable brand 1500 watt inverter. I have the BMS set to a maximum cell voltage of 3.4 volts so the overall voltage tops out at 13.6 volts and the SCC is set to a maximum of 13.8v (the BMS ends the charging at 13.6, there is no float). With small loads, everything is fine. Testing the inverter with higher loads using a heat gun on a setting around 700 watts, I see a draw of 50 amps through the BMS while no solar charging and I can switch the heat gun on and off without issue and the voltage obviously drops a little under load and returns to approximately 13 volts when the load is stopped. However, when I am charging with about 20 amps of solar and running the heat gun, I see a draw from the battery of around 30 amps (20 from solar, 30 from battery) and when the heat gun is turned off, the voltage to the input of the inverter shoots up to around 20 volts temporarily and the inverter either alarms or trips off completely until reset. I've confirmed this voltage overshoot is definitely coming from the Makeskyblue SCC. The inverter negative and charge controller negative are both connected to the BMS P negative and the inverter positive and charge controller positive connect directly to the battery positive terminal. Has anyone else seen a voltage overshoot with Makeskyblue solar charge controllers when load suddenly reduces?