The grid-tied ESS has three main working modes: self-consumption, time-of-use, and excess fed to the grid. You can change the working mode remotely.
- This mode applies to areas where the electricity price is high, or areas where the Feed In Tariff subsidy is low or unavailable.
- Excess PV energy is stored in batteries. When PV power is insufficient or no PV power is generated at night, batteries discharge to supply power to the loads, improving the self-consumption rate of the PV system and the self-sufficiency rate of residential energy, and reducing electricity costs.
- In this mode, Maximum self-consumption is selected. By default, the charge cutoff capacity is 100% and the discharge cutoff capacity is 15% for Huawei LUNA2000 batteries.
- This mode applies to scenarios where the price difference between peak and off-peak hours is large.
- In this mode, Time-of-use is selected. You can manually set the charge and discharge time segments. For example, you can allow the grid to charge batteries in low electricity price periods at night and discharge batteries during high electricity price periods, saving electricity fees. The charge from the grid function must be enabled.
- A maximum of 14-time segments can be set.
- In some countries, the grid is not allowed to charge batteries. Therefore, this mode cannot be used.
- This mode requires at least one charging period and one discharging period, the grid charges batteries during the charge time and supplies power to loads during the discharge time. In other time segments that are not set, the batteries do not discharge, and the PV modules and grid supply power to loads. (In grid-tied and off-grid mode, if the grid is powered off, the batteries can discharge at any time.)
Fully Fed to Grid
- This mode applies to the grid-tied scenario where PV energy is fully fed to the grid.
- This mode maximizes the PV energy for grid connection. When the generated PV energy in the daytime is greater than the maximum output capability of the inverter, the batteries are charged to store energy. When the PV energy is less than the maximum output capability of the inverter, batteries discharge to maximize the output energy of the inverter to the grid.
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The battery was installed and connected properly to the system.