When designing a solar system with Deye HV (High Voltage) inverters, it's important to understand certain technical aspects that differentiate them from low voltage (LV) inverters and influence how they interact with batteries and other components. This blog will cover some crucial points regarding parallel inverter setups, battery connections, and compatibility with other inverter types.

1. Parallel Operation: Each Inverter Requires Its Own Battery

When using Deye HV inverters in parallel, each inverter must have its own dedicated battery system. Unlike LV systems, where batteries can be connected in parallel and shared among multiple inverters, HV inverters require individual battery connections. This design ensures efficient energy storage and distribution for each inverter without overloading or under-utilizing any battery bank.

• Important Note: Ensure that each battery is properly sized for the corresponding inverter to optimize performance and avoid energy mismatches.

2. Connecting Batteries in Parallel: Same Capacity Requirement

When connecting batteries in parallel in an HV setup, all batteries must have the same capacity. This ensures balanced charging and discharging cycles, preventing one battery from being overused or undercharged compared to others. Unequal capacities can cause performance issues and even reduce the overall lifespan of the batteries.

However, if you are using different battery ports, batteries of different capacities can be used, as they are connected to separate circuits. This flexibility allows for more customizable system designs based on the available battery sizes.

• Example: If you have two battery ports on your Deye HV inverter, you can connect a 5kWh battery to one port and a 10kWh battery to the other without compromising system performance.

3. AC Coupling: On-Grid Inverter Capacity vs. Hybrid Inverter

If you're implementing AC coupling (connecting both an on-grid and a hybrid inverter), the capacity of the on-grid inverter must be less than the hybrid inverter. This is critical for ensuring that the hybrid inverter can effectively manage the power flow between the solar panels, batteries, and grid.

• Key Point: The hybrid inverter acts as the central control unit for energy storage and distribution, while the on-grid inverter primarily handles grid-tied energy production. Ensuring the hybrid inverter has a higher capacity avoids overloading the system during peak solar generation.

4. On-Grid Inverter Compatibility with Hybrid Inverters

The Deye HV hybrid inverters are compatible with a wide range of on-grid inverters, making them highly versatile in different system setups. Almost any brand of on-grid inverter can be connected to a hybrid inverter in an AC-coupled system, providing flexibility for users who may already have existing on-grid setups.

• Note: While most brands are compatible, it is still essential to check technical specifications and ensure the system is configured correctly for both safety and efficiency.

5. Additional Technical Insights

• Battery Communication: Ensure that the batteries you choose are compatible with Deye inverters in terms of communication protocols (e.g., CAN, RS485). This allows the inverter to effectively manage battery charge cycles and protect the system from overcharging or deep discharge.
• Monitoring and Management: Deye inverters come with advanced monitoring capabilities. By using the Deye app or web portal, you can monitor energy production, battery health, and overall system performance in real time, allowing for quick detection of any issues.

Conclusion

The Deye HV inverter system provides excellent flexibility and performance for high-voltage solar installations, but understanding the nuances of battery and inverter connections is crucial for optimizing system efficiency. From ensuring each inverter has its own battery to managing AC-coupled systems, these technical insights help ensure smooth and efficient operation. If you need further assistance in configuring your system or selecting the right components, feel free to reach out to our team of experts!