• Dagong ESS

What is SOC (State of Charge)

What is SOC (State of Charge)?

State of Charge (SOC) is a key indicator that represents the current charge level of a battery relative to its maximum capacity. It is expressed as a percentage (%) and provides critical data for battery management and system operation.
For example, a SOC of 100% means the battery is fully charged, while 0% indicates it is completely discharged.

Benefits of SOC

• Enables accurate energy scheduling and management

• Prevents overcharging and over-discharging

• Enhances battery safety and longevity

• Supports smart grid and load balancing

• Im proves user visibility and remote monitoring

Core Technologies of SOC Measurem ent

• Voltage-based estimation

• Coulomb counting (current integration)

• Kalman filter and neural network algorithms

• Multi-sensor fusion with real-time correction

• Integration with Battery Management System (BMS)

Challenges of SOC

Current SOC Challenges in the Energy Storage Industry

• Inaccurate SOC readings in dynamic load conditions

• SOC drift due to aging or extreme temperatures

• Difficulty in SOC estimation for large-scale systems with many cells

• Data inconsistency across different BMS platforms

• Integration complexity with third-party energy management systems (EMS)

Why Choose Dagong ESS Products?

Dagong ESS provides advanced energy storage solutions equipped with state-of-the-art SOC management technologies. Our systems are trusted by global clients across residential, commercial, and industrial sectors.

• Accurate SOC Estimation

Advanced algorithms ensure real-time and precise SOC tracking under various operating conditions.

• Integrated BMS + EMS Platform

Fully integrated systems support seamless monitoring, diagnostics, and remote SOC calibration.

• Wide Operating Temperature Range

SOC accuracy is maintained even in harsh environments thanks to robust thermal and voltage compensation strategies.

• Long Cycle Life & Stable Performance

Optimized SOC management helps extend battery lifespan and enhances overall system performance.

• Customizable SOC Settings

Dagong ESS provides customizable SOC thresholds and interfaces tailored to project-specific energy strategies.

Applications of SOC in Energy Storage Systems

• Residential Energy Storage

In home battery systems, SOC helps users understand daily energy usage and optimize solar self-consumption.

• Commercial & Industrial Applications

SOC is essential for peak shaving, demand response, and maintaining power continuity during outages.

• Grid-Connected Systems

In large-scale grid projects, SOC supports real-time dispatching, frequency regulation, and reserve control.

Dagong ESS Products Showcase

• Home ESS (5kWh–80kWh)

Ideal for residential solar + storage systems. Real-time SOC display allows homeowners to track energy use and battery status via mobile apps.

• Rack-Mounted ESS (30kWh–80kWh)

Compact design for light commercial use. Integrated BMS ensures accurate SOC readings and thermal management.

• Air-Cooled C&I Storage Cabinet (100kWh–215kWh)

Designed for energy peak shaving and backup. SOC is monitored across all modules with cloud-based alert systems.

• Liquid-Cooled ESS Cabinet(100kWh–372kWh)

High energy density and fast thermal dissipation. SOC accuracy is maintained even under high-power cycling conditions.

• Custom Containerized ESS Solutions

Scalable for utility-scale projects. SOC integration with external EMS enables smart grid control and energy arbitrage.

Frequently Asked Questions

Q1: How is SOC measured in your ESS products?

A: We use a combination of voltage monitoring, current integration, and intelligent algorithms such as Kalman filtering to ensure accurate SOC estimation.

Q2: Can I monitor the SOC remotely?

A: Yes, all Dagong ESS products support remote SOC monitoring via our web platform and mobile app.

Q3: What happens if the SOC goes below 10%?

A: The system automatically activates protection modes to prevent deep discharge and maintain battery health.

Q4: How often is the SOC recalibrated?

A: Our system performs dynamic SOC recalibration based on usage patterns and charge cycles to avoid drift.

Q5: Are Dagong ESS systems compatible with third-party PV inverters?

A: Yes, Dagong ESS solutions are designed to be flexible and can integrate with most mainstream inverters and EMS platforms.