1. Product Application Introduction

1.1 Application Scenario Introduction

1.1.1 Grid-connected AC coupling applications

Figure 1-1 Schematic diagram of grid-connected AC coupling access

Grid-tied AC coupling applications are suitable for the following situations:

1. The customer already has a photovoltaic system (PV + photovoltaic grid-connected inverter);
2. Customers need storage for power backup, peak load shifting, photovoltaic consumption, or demand regulation;
3. The system is not allowed to operate off-grid, and the system is required to have anti-islanding and anti-backflow functions.

At this time, the AC side of the energy storage system is connected to the grid-connected distribution cabinet, and then connected to the power grid through the grid-connected distribution cabinet.

1.1.2 Grid-connected DC coupling applications

Figure 1-2 Schematic diagram of grid-connected DC coupling access

Grid-connected DC coupling applications are suitable for the following situations:

1. The customer has not configured PV yet, but wants to configure a PV storage system;
2. Customers need storage for dynamic capacity expansion, photovoltaic arbitrage, peak load shifting, or demand regulation;
3. The system is not allowed to operate off-grid, and the system is required to have anti-islanding and anti-backflow functions.

At this time, the photovoltaic power is directly connected to the DCDC to charge the energy storage system. The AC side of the energy storage system is connected to the grid-connected distribution cabinet, and then connected to the grid through the grid-connected distribution cabinet.

1.1.3 On-grid and off-grid DC coupling applications

Figure 1-3-1 Schematic diagram of the on-grid and off-grid DC coupling scheme 1

Figure 1-3-2 Schematic diagram of the second access scheme for on-grid and off-grid DC coupling

On-grid and off-grid DC coupling applications are suitable for the following situations:

1. The customer has not configured PV yet, but wants to configure a PV storage system;
2. Customers need storage for dynamic capacity expansion, peak load shifting, demand regulation when connected to the grid, or for photovoltaic arbitrage and backup power when off-grid;
3. The load must not be powered off and must be supported and off-grid.

At this time, the energy storage system needs to be connected to STS. When connected to the grid, it is the same as 1.1.3. When it is detected to be off-grid, STS needs to perform seamless switching, the photovoltaic power is stored in the energy storage system, and the energy storage system discharges to the load. When off-grid, the diesel engine can also be connected as another backup energy source.

1.2 Application environment requirements

The normal working environment of the system should meet the following requirements:

4. Working environment temperature: -20℃~50℃.
5. Relative humidity ≤90%RH, no condensation on live parts.
6. Altitude ≤ 2000m, when exceeding the altitude, the system needs to be derated.
7. The air should not contain dust and conductive, corrosive, or explosive particles and gases that may affect normal work;
8. No vibration or shock, vertical inclination ≤5°.
9. Other areas with extreme temperatures (such as extreme cold or extreme heat) and marine climates (such as islands) are not within the scope of use of this product.

2 Product Features

This product has the following features:

1. High integration: The integrated cabinet can simultaneously integrate multiple devices such as battery system, battery management system (BMS), energy management system (EMS), power control system (PCS), DC-DC converter (DC/DC) and static transfer switch (STS), to maximize the system integration.
2. Flexible configuration: Users can choose appropriate device configuration according to different usage scenarios, and one product can meet the needs of multiple application scenarios.
3. Intelligent application: The energy management system (EMS) can optimize the mode configuration according to the specific usage scenario, provide customers with the best usage plan, and maximize customer benefits.
4. Safe and reliable: The system is integrated with first-line brand components. All components and systems have undergone strict safety certification and have multiple protection measures for battery management system (BMS) software and hardware. In addition, the cloud platform operation and maintenance system provides customers with comprehensive operation and maintenance support to ensure the safe and stable operation of the system, thereby solving customers’ worries.
5. 3.2.1 System parameter table 

   Figure 3-2 System diagram

   Table 3-1 Basic system parameters

   Item	Parameter Type	Parameters	60kW / 120kWh​
   1	Battery side parameters	Cell Type	LFP 3.2V / 280Ah
   2		System battery configuration	1P 9S​
   3		System capacity configuration	129.024kWh
   4		Battery voltage range	388.8 ~ 518.4 V
   5		Discharge Depth	90%DOD
   6		Maximum charge and discharge current on DC side	180A
   7		Maximum charging and discharging power on DC side	60kW
   8	AC side parameters (Grid-connected)	AC output power	66kVA@45℃
   9		Maximum AC current	100A
   10		Rated grid voltage	400V/230V (-20%~15%)
   11		Nominal grid frequency range	50Hz/45Hz~52Hz, 60Hz/55Hz~62Hz
   12		Harmonic distortion	＜3% (at rated power)
   13		Power Factor	-1~1 lead or lag
   14	AC side parameters (Off-grid)	Rated output voltage	400V/230V (-5%~5%)
   15		Harmonic distortion	＜2%（under resistive load）
   16		Unbalanced three-phase load	100%
   17		Rated frequency	50Hz/45Hz~55Hz, 60Hz/55Hz~65Hz
   18		Maximum AC power	66kVA
   19	Photovoltaic input parameters	Photovoltaic voltage range	200~850V
   20		MPPT voltage range	350~800V
   21		MPPT input quantity	4- way
   22		Maximum photovoltaic input power	32A *4 /19.2kW *4
   23	General parameters	Efficiency	Battery side: ≥90%
   			Hybrid Inverter maximum efficiency: 98%
   24		External communication interface	Ethernet
   25		Temperature control method	Air-cooling
   26		Dimensions (W*D*H)	1200* 900 *1800mm
   27		Weight	＜1.5t
   28		Protection level	IP54
   29		Corrosion resistance	C3
   30		Operating temperature range	-20℃~ 45 ℃ (>40℃ derating)
   31		Operating humidity range	5%~95%RH, non-condensing
   32		Altitude	3000 meters (＞3000 meters, derating)
   33		noise	≤75dB
   34		Certification	Battery: CB, UN38.3
   35			Hybrid Inverter Certification: EN50549, IEC62477, IEC6100, IEC62109
   			System: CE, UN3536