Optimization of the Battery Life (example)

Visualization of the function Optimization of the Battery Life (example) in Sunny Portal powered by ennexOS under Monitoring > Energy balance.

The optimization of the battery life is primarily evident in how long and at what times the battery is kept at high states of charge, in particular at a state of charge (SOC) of 100%. It is precisely this range that puts a particularly heavy strain on lithium batteries. Although modern lithium-ion batteries already have a long service life and cycle stability, the Energy Maximizer can further extend their service life through its targeted operating strategy.

The figure shows that the battery is no longer fully charged early in the day, rather it is used in a targeted, conserved manner.

In detail:

• Morning / midday: As PV generation increases, the battery is charged, but the state of charge does not rise to 100%. Instead, the battery remains below its maximum state of charge for several hours. Excess energy is either consumed directly or fed into the utility grid.

• Afternoon: The figure shows that the battery is not being discharged to provide power to the loads. The state of charge (SOC) remains at an almost constant level.

• Evening: Targeted recharging up to 100% only takes place in the evening hours. The full charge is reached shortly before subsequent discharging to supply the loads.

The length of time that the battery is charged to a state of charge of 100% is limited by the Energy Maximizer. This automatically optimizes the charging and discharging times based on generation and consumption forecasts. This ensures that the battery is operated specifically outside the aging-critical upper charging range, which reduces cell aging and extends battery life.