In a grid-connected system, it is possible to feed excess solar energy into the grid, if grid injection is authorized. Please confirm with the local regulation and utility directives if grid feeding is allowed in your country and for your specific situation.
Be careful with the grid-feeding function. Always respect the rules in force prescribed by your utility. Grid feeding with inverters connected to batteries is forbidden in some countries. There is no ENS function or any other similar function linked with the grid feeding function of xtender. You can add an external ENS detector.
There are two possible configurations for the grid feeding function:
- Standard grid feeding
In this configuration, the system will inject excess energy from the solar system to the grid. The solar energy is used first to supply loads and charge the battery. Additional energy is injected into the grid, only when the battery is charged. You can change in the inverter settings the maximum feeding current to the grid. (Parameter {1523} when parameter {1127} for grid feeding allowed value is set to Yes)
- Forced grid feeding
With the forced grid feeding setting it is possible to discharge the batteries towards the grid during a given time frame. Thus, between the start time {1525} and the stop time {1526}, the xtender will inject current from the batteries to the grid, discharging the batteries up to the Battery voltage target for forced grid feeding {1524}.
Grid feeding regulation
The grid feeding function will apply the frequency control strategy, reducing linearly the feeding current when the frequency is above the nominal frequency of the inverter. In addition, this function has a protection for limiting the power when the grid voltage is too high.
Please check our rcc manual for further description on the configuration of this limit and control.
Grid feeding with AC Coupling
The grid feeding function from the xtender is only related to the energy fed into the grid by the xtender from the DC side (battery). In a system with a solar inverter coupled in AC, the grid function from the xtender does not control or limit the energy fed into the grid by the solar inverter. For this, an external controller will be required.