Battery Grid Charge & Export

Grid Charge

Example 1: Maintain reserve capability

If you want to make sure the customer always has a bit of backup power in the battery in case of black-out, you might have the inverter set to do the following: if at 9 pm 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 9 pm to midnight. This is what the corresponding Energy Management Profile looks like:

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 grid charge function to top up the battery from the grid during the off-peak times, regardless of how full the battery is.

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 but not letting the battery drop below 40%.