Quick answer: Energy storage covers many technologies: lithium-ion and other batteries, flow batteries, pumped hydro, compressed air, thermal storage, flywheels and hydrogen. They store energy in different ways, but all of them depend on electrical balance-of-system equipment such as power conversion, controls, switchgear, transformers and enclosures. That equipment suffers when surfaces fall below the air's dew point. Humidity control protects those enclosures and rooms, not the storage process itself. The approach is the same across technologies: define the protected boundary, find the cold surfaces and moisture sources, and keep the dew point below the coldest surface.
Quick answer
- Many storage technologies; shared electrical equipment.
- Humidity control protects enclosures and rooms, not electrolytes or compressed air.
- Design on dew point vs coldest surface.
Technologies and their protected environments
| Technology | Protected environment | Typical moisture risk |
|---|---|---|
| Lithium-ion BESS | Battery cabinets, containers, PCS | Condensation on cooling plates, walls, after doors open |
| Flow batteries | Electrical cabinets, power conversion | Condensation on electronics; process liquids are separate |
| Pumped hydro | Powerhouse, switchgear, control rooms | Humid underground spaces, cold pipes |
| Compressed air (CAES) | Control rooms, electrical | Process air drying is separate from room humidity |
| Thermal storage | Control cabinets, MCCs | Night cooling, shutdowns; see solar thermal storage |
| Flywheels | Enclosures, power electronics | Condensation on power electronics and controls |
| Hydrogen | Electrolyser and fuel-cell electrical rooms | Safety ventilation governs; check moisture separately |
Related: solar thermal storage.
The US DOE summarises electricity storage technologies (US DOE, Electricity storage technologies report; DOE Office of Electricity, Energy storage). NFPA 855 covers installation of stationary energy storage systems (NFPA 855).
Condensation assessment, any technology
- Define the protected boundary (cabinet, container, room).
- Identify cold surfaces in each operating state.
- Identify moisture sources: leakage, doors, ventilation, process.
- Set a dew-point target below the coldest surface.
- Size moisture control; commission and verify.
See why humidity control matters in battery cabinets.
Selecting equipment
| Space | Typical solution |
|---|---|
| Single cabinet | Cabinet dehumidifier or heater |
| Container | Container-level dehumidifier |
| Room or powerhouse | Room dehumidifier; desiccant if cold |
Our energy storage dehumidifiers, electrical cabinet dehumidifiers and wind power dehumidifiers cover these spaces.
FAQ
Frequently asked questions
What are the main energy storage technologies?
Batteries (lithium-ion and others), flow batteries, pumped hydro, compressed air, thermal storage, flywheels and hydrogen.
Why does energy storage need humidity control?
Its electrical equipment and enclosures suffer condensation and corrosion when surfaces reach the dew point.
Is humidity control the same for every storage technology?
The method is the same, protecting enclosures by dew point, but the spaces and loads differ.
Sources
- US DOE, Electricity storage technologies report (2020).
- US DOE Office of Electricity, Energy storage.
- NFPA 855, Standard for the installation of stationary energy storage systems.
