Multiple working modes can be set, such as maximum self-consumption, TOU
(time-of-use), and fully fed to the grid.
If no PV module is installed in the system, only the TOU mode is supported.
- This mode applies to areas where the electricity price is high, or areas where the FIT(feed-in tariff) subsidy is low or unavailable.
- Excess PV energy is stored in batteries. When PV power is isufficient 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 in settings. By default, the charge cutoff capacity is 100% and the discharge cutoff capacity is 0% for Huawei LUNA2000 batteries.
Examples of self-consumption:
(1) When the sunlight is sufficient, the PV module outputs 8 kW power, the loads consume 4 kW power, and the batteries charge 4 kW power.
(2) When the sunlight becomes weak, the PV module outputs 3 kW power, the loads consume 4 kW power, and the batteries discharge to supply 1 kW power to the loads.
Typical example of the Maximum Self-Consumption:
- This mode applies to scenarios where the price difference between peak and off-peak hours is large.
- In this mode, TOU (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 fee. The charge from 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.)
Examples of the TOU (time-of-use) electricity price:
Set power consumption peak hours (14:00 to 24:00) as the discharge time. During this time, the batteries discharge. During other periods, such as 03:00-14:00, surplus PV energy can be used to charge the batteries, and the batteries do not discharge. When the load power supply is isufficient, the grid supplies power to the loads. For example, when the sunlight is insufficient, the PV module outputs 3 kW power, the loads consume 4 kW power, and the grid supplies 1 kW power to the loads.
Typical example of the TOU:
Fully Fed to Grid
This mode applies to the grid-tied scenario where PV energy is fully fed to the
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.
In this mode, Fully fed to grid is selected.
Example of Fully fed to grid:
For example, when the PV modules generate 8 kW power, the SUN2000-5KTL inverter connects to the grid with the maximum output power of 5.5 kW, and the batteries charge 2.5 kW power. When the sunlight becomes weak, the PV modules generate 3 kW power, the batteries discharge 2.5 kW power, and the inverter connects to the grid with the maximum output power of 5.5 kW.