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Figure1-9 Grid is abnormal
Mode 3: Micro-grid mode
Suitable for Areas without Grid
1. The Micro-grid power source comes from PV, battery.
2. If PV is sufficient, PV power will supply to the load, then charge the battery. (Figure1-10)
3. When PV is insufficient, Battery supplys power to the load. (Figure1-11)
Typical application scenarios:
Figure1-10 Sunny day Figure1-11 Night
Mode 4: Peak -Bottom mode
Suitable for Areas with Changing Electricity Price
According to the electricity price of utility, the whole day can be divided into four periods (most of the
place): tip, peak, flat and bottom price.
1. During the price of the bottom period, the grid or/and PV charge the batteries and supply to loads
together to storage the electric power. Battery never discharge at this stage.
2. During the price of the flat period, when the PV is sufficient, it provides power in the sequence of
load,battery and grid.
3. During the price of tip and peak period, the battery and PV provides power to the laod, if more
energy will sell to Grid to obtain profit. Battery never charges at this stage.