Performance and Reliability Foresight/SRP/Bolster

This page hosts all detailed analysis performed for the bolster system.

Historical Operation

Figure 1. The past month of operation for the Bolster system

Round Trip Efficiency

Although the Bolster BESS is not yet performing regular reference performance test cycles, recent operation can provide a glimpse into its round trip efficiency (RTE). Because the system is performing repeated high energy charge & discharge half cycles it is possible to compare these events to get a sense of round trip efficiency. Note, specual care must be taken when performing calculations as the half cycles often do not start and end at the same state of charge.

To arrive at these calculations the following steps are taken:

1. A "half cycle detection" algorithm is applied to all historical State of Charge (SoC) and AC Power data.
2. All identified charge and discharge half cycles are paired into groups
3. For each group, a common SoC boundary is identified and the half cycles are windowed on these boundaries to ensure that the same SoC ranges are being compared
4. The energy of each bounded half cycle is compared to calculate the RTE

Figure 2 shows the half cycles grouped together. Hover over each charge / discharge group to see the round trip efficiency calculation and SoC Range details.

Figure 2. A look at past charge and discharge half cycles which are grouped together to calculate a rough RTE.