Storage capacity
Storage capacity in the SpeicherCampus context: determines the amount of energy and the bridging time. Technically, the term is usually described as capacity in kWh or MWh.
What does storage capacity mean?
Storage capacity denotes a system’s energy content in kWh or MWh — how much energy it can hold at most. Distinguish gross capacity from usable capacity: DoD limits, reserves and ageing reduce what is actually available day to day.
The right size is not “more helps more”: an oversized system never fills, cycles uneconomically and ties up capital; an undersized one runs empty constantly and misses its tasks.
What matters in practice
- derive the size from PV surplus, consumption shifting and the backup reserve
- calculate with usable capacity, not catalogue capacity
- plan for degradation over the term (capacity at end of warranty)
- check expandability instead of buying ahead of need
Practical example
A business with 60 kWh of daily PV surplus and 40 kWh of evening consumption chooses 215 kWh — not for daily operation, but for the desired three-hour backup reserve. Without that requirement, 100 kWh would have sufficed.
The SpeicherCampus perspective
SpeicherCampus derives storage capacity from the applications and states usable capacity and reserves separately — so the number in the offer is the same as the one in operation.