Why should you invest in a PV-Bess integrated energy system?

With the promotion of renewable energy utilization and the trend of a low-carbon society, the real-life application of photovoltaic (PV) combined with battery energy storage systems (BESS) has thrived recently. Cost–benefit has always been regarded as one of the vital factors for motivating PV-BESS integrated energy systems investment.

Is it possible to combine PV and energy storage?

Ideally, all of your consumption can be supplied by the combination of your PV and energy storage. The cost-benefit analysis is done in the form of a study case that represents a residential unit with an already existing PV system. Therefore, the costs of the PV system are not considered.

What is the energy storage capacity of a PV system?

The PV system capacity is varied from 0 to 18 kWp, which is realistic for a family house. The parameters of the energy storage system are chosen according to the current state-of-the-art (in doubt rather conservative). The energy storage capacity is varied between 0 and 14 kWh.

How does PV energy storage work?

Electricity is consumed around the clock while the sun only shines during the day and, therefore, the PV only produces electricity during the day. With an energy storage, this problem can be tackled by storing energy when there is a surplus of PV production and releasing energy when the consumption is higher.

How does independent PV + storage increase value?

Increases value by about 1% relative to independent PV + storage. In other periods (July 1 shown here), storage plant cannot be fully utilized because of the operation of the PV system. Combined output of independent PV + storage plant (left figure) is as high as 70 MW, which is possible because of the separate inverters.

How much does a PV system save per year?

The yearly benefit for each scenario in the form of savings can be directly seen in the graphic, e.g. for the PV system with a capacity of 12 kWp and a 4 kWh storage, the maximum savings are about 50 € per year. Fig.3: Yearly savings for different storage and PV capacities based on the yearly electricity costs without storage.