Energy Storage Converter (PCS) Off-Grid Mode — Application Guidelines for Different Load Characteristics
1. Pure Resistive Loads
- Load power ≤ PCS rated power;100% load-carrying capability is supported.
- Recommended sizing ratio: 80% of rated load capacity.
2. Pure Inductive Loads
- Load power ≤ 15%–20% of PCS rated power.
- Examples of such loads: direct-on-line motors, water pumps, electric drills, air conditioners (non-inverter type), and other inrush loads.
3. Inverter-Type Loads
- Load power ≤ 60% of PCS rated power.
- For conventional loads such as inverter air conditioners + lighting, the loading ratio shall be configured at ≤ 70% of PCS rated power.
4. Special Loads
- Applicable objects: loads with high power-quality requirements, such as tungsten stage lights and AC EV charging stations.
- Treatment method: add an isolation transformer at the AC output of the PCS.
- Recommended transformer type: Dyn11.
- Purpose: to enhance reliability and anti-interference capability.
5. PCS Off-Grid Mode Operating Parameters
- Power factor ≥ 0.8 (for pure resistive loads).
- Single module: the single-step loading ratio can support 100% connection/disconnection; 80% connection is recommended.
- Multi-module off-grid start-up: the single-step loading ratio is recommended at ≤ 40%, with the remaining load connected gradually.
- Special applications: the design scheme and load characteristics must be confirmed in detail with Enjie (恩玖) technical personnel to determine the appropriate PCS capacity sizing.
6. Single-Phase Output
- Single-phase output is also subject to the limitations stated above.
- 100% unbalanced load carrying is supported.
- Single-phase rated power equals 1/3 of the PCS rated power.