The Steca Solarix PI 1100 with LiFePO4 - FAQ

Q: Can the Steca PI 1100 inverters with LiFePo4 batteries?
Yes, the Steca PI1100 inverters were tested with the LiFePo4. The 24V models are designed to be used with a pack of 8 cells (24V).

Q: If batteries are getting empty, when is the load disconnected?The “Safety Low voltage disconnect function” is will disconnect the load when the battery voltage drops down (usually because of discharge). The disconnect level depends on the amount of current. If a high current is being taken from the batteries, the safety disconnect is done later than if the low currents are taken.

Q: What is the disconnecting voltage?
Our tests show following:  with high currents the load is being disconnected at 20.8V per pack, with small currents the low voltages disconnect is between 21.6V to 23.2V,

Q: Should I use the BMS?
Yes. We strongly recommend using the BMS to monitor and protect the cells on the individual cell level. We suggest always to use the BMS as additional safety disconnect at low voltage. In case of failure of the Steca inverter, the BMS would disconnect the battery pack as a protection. See additional information here: understanding the BMS operation.

Q: Does the Steca PI 1100 need restarting manually after low voltage fail-safe was activated?
No, the PI1100 inverter does not need a manual restart after the low voltage disconnect. When the voltage at the batteries returns back to the normal level, the inverter will start working again automatically.