One-stop solution for photovoltaic storage and charging
An integrated PV-storage-charging solution balances local energy generation and load through energy storage and allocation optimization. It profits from PV power generation and charging operations, while achieving efficient, stable, and safe charging.“Source-Grid-Load-Storage” Integrated Operation Will Become the Mainstream of Future Energy Development
1. Comparison of the advantages and disadvantages of PV storage and ultra-fast charging piles vs. ordinary charging piles
Photovoltaic storage and ultra-fast charging pile
Definition: A charging station that combines photovoltaic power generation (Solar), energy storage batteries (Storage) and high-power ultra-fast charging (Ultra-fast Charging), supporting high-power DC fast charging (such as 350kW+).
Advantages:
Energy independence and environmental protection:
Photovoltaic power generation reduces dependence on the power grid and reduces carbon emissions.
Energy storage systems can smooth out grid fluctuations and achieve peak-valley electricity price arbitrage.
High-power charging:
Supports ultra-fast charging (such as Tesla V4, Huawei 600kW), and replenishes 80% of energy in 10-15 minutes.
Grid pressure relief:
Energy storage systems can discharge during peak grid loads to avoid transformer overload.
Redundant reliability:
Photovoltaic + energy storage provides multiple power backup for charging piles, which can still operate for a short period of time during power outages.
Disadvantages:
High initial cost:
The cost of photovoltaic panels and energy storage batteries (such as lithium battery systems) accounts for more than 50% of the total investment.
Large floor space: Additional space is required to install photovoltaic arrays and energy storage equipment.
Technical complexity: Energy management system (EMS) for photovoltaic, energy storage and charging needs to be coordinated, which is difficult to maintain.
Ordinary charging pile
Definition: Traditional charging station that directly relies on power grid, with low charging power (such as 7kW AC slow charging or 120kW DC fast charging).
Advantages:
Low construction cost:
No need for photovoltaic and energy storage equipment, the initial investment is only 30%-50% of photovoltaic storage and charging.
Flexible deployment:
Suitable for limited space scenarios such as urban parking lots and shopping malls.
Simple operation and maintenance:
No complex energy management, low maintenance cost.
Disadvantages:
Depends on grid stability:
Cannot operate when the grid fluctuates or when there is a power outage.
Limited charging speed:
Ordinary fast charging takes 30-60 minutes to charge to 80%, which cannot meet the needs of ultra-fast charging.
High electricity cost:
Unable to use low-priced photovoltaic electricity or energy storage for peak load regulation.
2. Application and model differences of high-voltage DC contactors
a. Application scenarios
Photovoltaic storage and supercharging stations:
Charging and discharging control: used for the DC circuit between the energy storage battery and the charging pile (such as 1000VDC/400A).
Photovoltaic system protection: isolate the photovoltaic array and the inverter to prevent backflow.
Supercharging pile core switch: supports high-power fast charging (such as 800V platform, maximum current 600A).
Ordinary charging station:
Mainly used for circuit protection of DC fast charging piles (such as 200-500VDC/200A).
b. Model difference
The following parameters should be paid attention to when selecting a high-voltage DC contactor:
Parameters. PV storage and supercharging station Ordinary charging pile
Voltage level 800V-1500V DC (adapting to high-voltage platforms) 200-750V DC
Rated current 400A-1000A (supercharging requirements) 100A-400A
Breaking capacity ≥10kA (to deal with short-circuit faults) 5kA-10kA
Lifespan ≥300,000 times ≥200,000 times
Protection level IP67 (outdoor dust and water resistance) IP54 (indoor or semi-outdoor)
c. Comparison of typical models
Special models for supercharging stations:
Hotson HEVQ600: 1500VDC/600A, breaking capacity 10kA, suitable for 800V supercharging platform.
Siemens 3RT1045-6AP36: 1200VDC/630A, with arc extinguishing design, suitable for energy storage system.
Ordinary charging station models:
Hotson HEVQ250: 1000VDC/250A, low cost, suitable for 120kW fast charging piles.
Panasonic AEV14012: 500VDC/400A, balanced cost performance, used in small and medium power scenarios.
Summary and Suggestions
Solar storage and supercharging stations are suitable for high-traffic scenarios (such as highway service areas, Hypermarket: IKEA, Carrefour, Kaufland, Costco, Sam’s Club ) ,and must take into account environmental protection and future scalability.
Ordinary charging stations are suitable for urban power replenishment needs and can be quickly covered at low cost.
The selection of high-voltage DC contactors needs to match the voltage/current peak value. Supercharging stations give priority to models with high life and high breaking capacity (such as the Hotson HEVQ series).
Looking to enhance the safety and performance of your electrical systems with high voltage DC contactor? Partner with HOTSON. We specialize in providing businesses like yours with advanced DC EV charging solutions that guarantee reliability and help you stand out in the market. Reach out to us today to discover how our expertise in high-voltage protection can drive your success. Let HOTSON be your trusted ally in the ever-evolving world of Smart Micro-grid Solution (generation-grid-load-storage).
