What Are Rated Capacity and Usable Capacity?

• Rated Capacity refers to the total theoretical amount of energy a battery can store, measured in kilowatt-hours (kWh). It is typically listed in technical datasheets and used for product comparison.

• Usable Capacity, also known as net capacity, indicates the actual amount of energy available for discharge. It is usually lower due to system protections, depth of discharge (DOD) limits, and safety margins.

For example, a battery with a rated capacity of 100 kWh may only provide 90 kWh of usable energy.

Why Both Capacities Matter

• Accurate Project Estimation: Usable capacity determines how long a system can power your equipment or home.

• Realistic ROI Planning: Cost-benefit calculations should be based on usable, not theoretical, capacity.

• Lifecycle Impact: A well-designed DOD can significantly extend battery lifespan.

Real-World Applications

• Residential Systems: Usable capacity helps homeowners understand how long backup power will last.

• Commercial & Industrial Projects: Determines energy cost savings from peak shaving and arbitrage strategies.

• Renewable Integration: Ensures storage can match fluctuating solar or wind output.

• Grid Services: Usable capacity defines eligibility for frequency regulation and load shifting.

What Dagong ESS Offers

Dagong ESS provides a full portfolio of storage solutions:

• Residential systems: 5–20 kWh wall-mounted or rack batteries

• C&I applications: 100–215 kWh integrated cabinets with air or liquid cooling

• Utility-scale deployments: 5 MWh liquid-cooled container systems with high energy density and safety

Every product clearly specifies both rated and usable capacity, and supports adjustable DOD settings to balance system longevity and real-world performance. Customization is available to meet specific project requirements.

Pricing & Procurement Considerations

ESS pricing is typically based on usable capacity, and also depends on:

• Battery chemistry (e.g., LFP vs. NMC)

• System configuration (battery packs, BMS, PCS)

• Cooling method (air-cooled or liquid-cooled)

• Trade terms (EXW, FOB, CIF) and shipping routes

For the most accurate quote, it’s recommended to share your project’s load profile and energy goals. Dagong ESS provides professional support for selection, configuration, and lifecycle planning.

How Long Will the System Last?

Dagong ESS systems use high-quality LFP battery cells with configurable DOD, designed to deliver:

• ≥ 6,000 charge-discharge cycles

• 10–15 years of operating life

• Smart monitoring and remote maintenance support

Why Choose Dagong ESS?

Dagong ESS is committed to delivering reliable, safe, and transparently specified energy storage systems to global customers. From clearly defined capacity ratings to tailored system designs, we ensure you get the performance you expect—with no surprises.

For technical specs or customized quotations, contact us at: sales@dagongess.com