Accounting for the battery wear and efficiency
The SmartgridOne Controller's control algorithm, when set to cost optimization, takes into account battery efficiency, as well as a minimum price difference (between less expensive and more expensive moments) that must be present before the SmartgridOne Controller will use the battery. You can use that minimum price difference to factor in battery wear.
You can set the efficiency under the "Devices"→"Change settings" tab under the corresponding battery→"Roundtrip efficiency (%)."
The wear cost can be set under "Settings"→"Default working mode"→ storage devices in "Cost optimization" → "Predictive AI algorithm settings" → "Tuning parameters": tick "Factor battery wear into decisions" and enter the wear cost in cent/kWh per charging cycle. This option is visible if cost optimization with the predictive AI algorithm is active for storage. See also Battery cost optimization settings.
Note
Older software versions had this setting as "Minimum price difference between peak and off-peak for use of storage (EUR/kWh)" on the settings page. It is the same setting; only the unit changed from EUR/kWh to cent/kWh.
Note
Please note: The control algorithm will only utilize the battery when controlling for cost optimization if the price of the energy with which it is charged is sufficiently lower than the price of the energy at the scheduled time of discharge.
This takes both into account the stated minimum price difference and the efficiency of the battery. After all, the losses when charging/discharging the battery also have a cost.
The price of the charged energy depends on:
- Whether the charged energy comes from its own production (then the selling price of the energy to the grid is used)
- Whether the charged energy comes from the grid (then the purchase price of energy from the grid is used)
- Battery wear cost
- Battery efficiency
Example:
If the purchase price of energy from the grid is 0.20 EUR/kWh at time B, and the battery has an efficiency of 80%, and a minimum price differential of 0.04 EUR/kWh is set, then the battery will only charge at an earlier time A to cover the consumption at that purchase price at time B as soon as the purchase price at the time A of charging is lower than:
0.20 EUR/kWh - 0.20 EUR/kWh*(1-0.80) - 0.04 EUR/kWh = 0.11 EUR/kWh.
Consequences:
This may mean that during periods of long-term stable prices, the battery is hardly ever used. After all, the difference between the minimum and maximum energy price is then potentially rarely greater than the utility cost of the battery.