Solar energy storage system 150kW solar panels 430kWh energy storage battery 200KWP AC output power

1.  Project Overview

1.1. Project electricity requirement

      In off-grid area, solar photovoltaic (PV) + energy storage systems are utilized for load power supply. The installed capacity of the PV system is approximately 150 kW, and all the generated electricity is stored in batteries for off-grid load consumption.

1.2 Project Application Environment

      The project is with an average of approximately 3.31 hours of effective photovoltaic sunshine per day.

      The project plans to construct a 150 kW solar energy storage power station. It is equipped with a total of 256 monocrystalline solar panels, each with a capacity of 580W, arranged in a series parallel configuration.

      Additionally, the system includes one set of 200 kW off-grid inverter module, one 430 kWh battery pack, and one set of 200 kW energy storage inverter PCS. The estimated daily electricity generation of the power station is approximately 400 kWh.

2.  System Main Equipment Configuration Table

      This average sunshine approx 3.31 hours a day in this project.

      So the solar system produce electricity per day:148.48kw*3.31*0.8=393kwh

      And the All-in-one battery cabinet recommend :LiFePo4 battery 430kwh(2battery cabinets*215kWh/cabinet), recommend discharge deepth DOD90%(387kwh available) +200kW DC-DC PCS(solar power conversion system) and 200KW DC-AC PCS(AC output:400Vc,3WeN+PE/3W+PE) + Cooling system +fire fighting system+EMS.

Details as below:

3.  The composition principle of photovoltaic power generation system

      The solar energy storage off-grid power generation system consists of photovoltaic modules,inverters, AC-DC combiner boxes, and energy storage batteries, among other modules. The inverter and energy storage batteries are integrated into a separate battery cabinet.

      The photovoltaic modules are connected in series through 3 photovoltaic combiner boxes, and the electrical energy is delivered to the DC-DC inverter module inside the separate battery cabinet. The EMS system intelligently manages the use of electrical energy, delivering it to the battery pack for charging as per demand. Alternatively, the electrical energy can be inverted into AC power using the 5 DC-AC inverter modules inside the battery cabinet and supplied to the load system.

      The working principle of the battery cabinet and the entire power supply system is shown in the module diagram below:

Solar energy storage system

3.1  PV Module

      The photovoltaic energy storage module selected is a monocrystalline silicon module with a power output of 580W. The specific parameters are as follows:

      This project intends to use 580Wp monocrystalline silicon photovoltaic energy storage modules. Multiple modules will be connected in series and connected to the photovoltaic inverter integrated machine through a combiner box. The total number of installed energy storage modules is designed to be 256, with a total capacity of 148.48kWp.

3.2  PV array design

      The photovoltaic brackets of this project are installed on the cement flat roof, using a 2*2 array, made of aluminum alloy brackets, and an east-west ballast scheme, which is more suitable for low-latitude areas in Africa. 256 boards require a total of 4*64 arrays. 

      The total area is expected to be approximately 5m*160m = 800m².

3.3  PV box

      The converter box is divided into DC converter box and AC converter box. DC converter box is used in DC side for convergence, which can detect and protect multiple DC strings against lightning, and at the same time, it can reduce the number of DC wires for easy construction and control. The AC converter box is used on the AC side after inverter to converge multiple AC lines, which can save wires and reduce construction difficulties.

3.3  Integrated energy storage system cabinet

      The large-scale intelligent energy storage system takes the lithium iron phosphate battery as the energy carrier, charges  and discharges through PCS, realises various energy exchanges with the power system, and can be connected to various power supply modes, such as photovoltaic array, wind energy, diesel generator and power grid and other energy storage systems. The output of the energy storage system can be connected to the grid, supplied to a variety of load equipment, and charged by electric vehicles.The output of the energy storage system can be connected to the grid, supplied to various load devices and electric vehicle chargers.

Product electrical topology diagram

      The primary circuit of the energy storage system integrated cabinet includes the battery system, cluster control box, energy conversion system PCS, and output molded case circuit breaker; the battery system output is controlled and protected by the cluster control box and connected to the DC side of the PCS.

      This energy storage system cabinet contains lithium battery pack,battery management system(BMS), energy conversion system(PCS), control system (EMS), air conditioning, cooling and other equipment.The core of the technology is the battery pack,battery cluster structure design, battery system thermal design, battery system protection technology, battery management system etc.

      This distributed off-grid power generation system adopts energy storage system power integrated cabinet*2 cabinets:

      A: The internal part of the battery cabinet, integrating 1 cluster of battery packs, each cluster of 215.04kWh + BMS high voltage management system, fire + cooling + EMS + ATS and other auxiliary systems. 

      B: Power conversion system(PCS), with AC rated output power 100KW (2sets of DC-AC conversion modules)+DC input rated power 100 KW (2sets of DC-DC conversion module)

      The following diagram shows the internal structure of a single integrated cabinet, including the battery system and electrical compartment (including PCS and other control modules) , etc. , for reference only:

All-in-one battery cabinet 215kwh-100kw

      1.Battery cluster: battery packs 64V280Ah (17 .92kwh) /set  *12sets=215.04kwh

      2.100kwAC output PCS( 400Vc,3WeN+PE /3W+ PE)+100KW DC input rated power inverter.

      This cabinet also include air conditioner,fire fighting system,and high voltage system,EMS,ATS.

      Size:1800*1200*2300mm,weight:2200kg

3.4.1  Battery main parameters

Cell Parameter：

Battery Packs Parameter：

Battery Cluster Cabinet Parameter：

3.4.2  Battery Management System(BMS)

      The energy storage battery management system adopts a two-level framework, including battery management unit BMU and battery cluster management unit BCMS.

      The battery management unit (BMU) is mainly used to collect the single cell voltage,temperature equalizing voltage, equalizing current, total battery string voltage, pressure data, fan speed, etc., calculate the battery characteristic  information, alarm and protection status, record important logs, events and other data during the operation of the battery module, implement the temperature control strategy, equalizing strategy, etc. issued by BCMS, and report the battery related data to BCMS.

      The battery cluster management system (BCMS) is mainly used to obtain the battery system voltage, current, temperature and other information for processing, calculate the battery cluster SOC, SOH, rechargeable and discharged power, cluster operation alarm and protection status, record all important operation, alarm and protection log files, real-time record all the battery cluster operation information during the system operation, and execute the dispatching and control instructions issued by the superior.

3.4.3 Power Conversion System   (PCS)

      This distributed off-grid power generation system adopts Power conversion system(PCS) with AC rated output power100KW (2sets of DC-AC conversion modules 400V,3P+N+PE,50HZ)+DC input rated power 100KW (2sets of DC- DC conversion module)

PCS Topographic map

Parameter：

3.4.4  EMS Energy Management System

      The system is equipped with an energy management system EMS , which uniformly coordinates and controls each equipment in the complete set of energy storage projects. Users can execute various operation commands through the LCD display interface, timely obtain the current equipment status and real-time alarm information.

      The operation mode of the energy storage system can be divided into three types: 

      1.Grid-connected automatic mode: The energy storage system is automatically connected to the grid according to the pre-set time-sharing charge and discharge power.

      2.Grid-connected manual mode: The energy storage system runs in grid-connected mode, but the system must be manually operated by the user to operate the LCD touch screen when starting or shutting down.

      3.Off-grid manual mode: The energy storage system runs in off-grid mode, but the start or shutdown of energy storage must be manually operated by the user LCD touch screen.

3.4.5  Fire fighting system

      The integrated battery cabinet is equipped with an automatic fire extinguishing system mainly made of perfluorohexane. Once a fire is detected, the integrated cabinet should be able to disconnect the electrical connection with external equipment in a timely manner and activate the fire extinguishing device.

4.  Packaging Method

      Pallets are safely packed and suitable for logistics.