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Composition of china Off-grid Photovoltaic Energy Storage System products

Composition of china Off-grid Photovoltaic Energy Storage System products

  • Categories:Battery Cabinet
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  • Time of issue:2021-12-21 21:52
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(Summary description)Photovoltaic module, off grid inverter (including photovoltaic charger / inverter), energy storage battery (lead acid / colloid / lead carbon / ternary lithium / lithium iron phosphate, etc.), photovoltaic support, cable and distribution box are important components of Off-grid Photovoltaic Energy Storage System products.

Composition of china Off-grid Photovoltaic Energy Storage System products

(Summary description)Photovoltaic module, off grid inverter (including photovoltaic charger / inverter), energy storage battery (lead acid / colloid / lead carbon / ternary lithium / lithium iron phosphate, etc.), photovoltaic support, cable and distribution box are important components of Off-grid Photovoltaic Energy Storage System products.

  • Categories:Battery Cabinet
  • Author:
  • Origin:
  • Time of issue:2021-12-21 21:52
  • Views:
Information

Photovoltaic module, off grid inverter (including photovoltaic charger / inverter), energy storage battery (lead acid / colloid / lead carbon / ternary lithium / lithium iron phosphate, etc.), photovoltaic support, cable and distribution box are important components of Off-grid Photovoltaic Energy Storage System products.

The biggest difference between the off grid system and the grid connected system is that the grid connected system takes the investment income as the calculation premise, while the off grid system takes the just needed power supply as the basic demand, so they will have different emphases in selecting components.

Components of china Off-grid Photovoltaic Energy Storage System products

At first, photovoltaic modules were only used in some off grid systems and small photovoltaic systems. Later, with the large-scale development of photovoltaic grid connected applications and the annual update of photovoltaic module technology, the module conversion efficiency has been greatly improved. In particular, some grid connected power stations need more efficient components to improve the investment return ratio because they want to make full use of site resources. Of course, due to the relatively large site, the general off grid system does not have high requirements for component conversion efficiency, so conventional components are often the first factor to consider when selecting components in system design.

Off grid inverter of china Off-grid Photovoltaic Energy Storage System products

1. Take AC load as the consideration point. General loads are divided into three categories: Group loads (electric lights, heaters, etc.), inductive loads (air conditioners, motors, etc.) and capacitive loads (computer host power supply, etc.). Since the current required for inductive load startup is 3 ~ 5 times of the rated time, and the short-time overload capacity of 150% - 200% of the general off grid inverter can not meet the requirements, the inductive load needs to consider the capacity expansion design of the inverter (when the off grid inverter is connected to the inductive load, the system design of at least twice the inductive load is required). For example, in the project where the off grid inverter drives 2p (2 * 750W) air conditioning, the inverter with rated power of 3KVA and above is the normal configuration. Of course, three types of loads exist at the same time, but the load with the largest proportion will have a main impact on the inverter.

2. Take the DC side as the consideration point. Off grid inverter has built-in photovoltaic charger, which generally has two types: MPPT and PWM. With the technical update, PWM charger has been phased out, and MPPT charger has become the first choice of off grid inverter.

3. Other options. In addition to the above two options, there are many calculation formulas on the market, which will not be repeated. But the general direction is: 1) determine the rated power of off grid inverter according to the load size and type; 2) Determine the kWh value of the energy storage battery pack according to the discharge duration of the energy storage battery required by the load; 3) Determine the charger power according to the local sunshine conditions and charging time requirements (for example, it needs to be fully charged within one day).

Energy storage battery of china Off-grid Photovoltaic Energy Storage System products

1. Lead acid / colloidal battery: maintenance free sealed lead-acid battery is generally selected for energy storage system to reduce later maintenance. After 150 years of development, lead-acid battery has significant advantages in stability, safety and price. It is not only the battery type with the highest proportion in the application of energy storage battery, but also the first energy storage battery type of photovoltaic off grid system.

2. Lead carbon battery: a technology developed from traditional lead-acid battery. It can significantly improve the service life of lead-acid battery by adding activated carbon to the negative electrode of lead-acid battery. However, as a technical update of lead-acid battery, its cost is slightly higher;

3. Ternary lithium / lithium iron phosphate battery: compared with the above two types of energy storage batteries, lithium-ion batteries have the characteristics of higher power density, more charge discharge cycles and better discharge depth. However, due to the need for additional battery management technology (BMS), the system cost of ternary lithium / lithium iron phosphate battery is generally 2-3 times that of lead-acid battery. In addition, compared with lead-acid / lead-carbon battery, its thermal stability is also slightly insufficient, so its application proportion in photovoltaic off grid system is not high. However, it is worth mentioning that with the breakthrough of technological renewal, the market share of ternary lithium / lithium iron phosphate battery is also gradually increasing, which is a big problem New application trends.

 

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