The battery throughput is calculated above for 1 cycle per day and taking the degradation and efficiency into account. Note how the Soap battery (red) although least expensive has a markedly lower throughput.

The Joe battery (green) performs quite well up to year 10 but is then end-of-life.

Overall

Effective cost per kWh

cost / Year 5
cost / Year 7
cost / Year 10
cost / Year 12
cost / Year 15

volstora SuperTitan

€500

€0.288 (1734kWh)
€0.208 (2403kWh)
€0.148 (3380kWh)
€0.125 (4013kWh)
€0.10 (4936kWh)

Joe’s Battery

€330

€0.205 (1610kWh)
€0.151 (2181kWh)
€0.111 (2956kWh)
–
–

Soap’s Battery

€250

€0.168 (1489kWh)
€0.144 (1734kWh)
–

From this picture it would seem that the Joe’s battery is most attractive for the overall energy storage system and the Soap’s battery is only effective for short-lifetime applications up to 7 years.

However, energy storage is built with more than the base cost of batteries which can skew the overall price per kWh.

Overall

Battery cost

Complete system installation

Total

Total cost / Year 10 kWh
Total cost / Year 15 kWh
VOLSTORA SuperTitan€210000
€53000
€263000
€0.155/kWh
€0.107/kWh

Joe’s Battery

€165000
€53000
€218000
€0.147/kWh
–

Soap’s Battery

€125000
€53000
€178000
€0.205/kWh
–

Notice that initially, Soap’s battery is 70% cheaper than Volstora and Joe’s battery is 21% cheaper but on a system level over 10 years, Joe’s battery is 5% cheaper and Soap’s battery is 25% more expensive!

The risk with Joe’s battery is quite high, as one year of premature failure will increase the cost per kWh over 10 years by 9%. For many projects, such a high performance risk will outweigh the reward.

The Volstora storage system has a far larger safety margin as the lifetime and performance of titanium storage is more than double what LFP batteries can achieve. This is important because risk in energy storage is a major issue and the chart below illustrates the difference in risk.

Battery Throughput - Case Study

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