Grid Charge
Example 1: Maintain reserve capability. If you want to make sure the customer always has a bit of back-up power in the battery in case of black-out, you might have the inverter set to do the following: if at 9pm the battery is below 40%, start charging it from the grid, and stop the grid charge when it reaches 40%. Do this only at a rate of 2 kW in the off-peak time of 9pm to midnight.
This is what the corresponding Energy Management Profile looks like:
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Example 2: Energy Arbitrage. If you want to take full advantage of very cheap off-peak rates to charge the battery for use in the early morning before the sun comes out, you could set the Energy Management Function to top up from the grid during the off-peak times, regardless of how full the battery is, as follows:
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SoC Range - lower value: The battery will discharge until it reaches this SoC.
SoC Range - upper value: The battery will stop charging from the grid if it reaches this SoC.
Export Battery energy to the grid
Similarly, you can model the effect of discharging the battery to the grid when feed-in tariffs are high, for example between 7 pm and 9 pm, at a rate of 10c/kWh, but not letting the battery drop below 40%.
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