1. Introduction: Why is the difference between AC and DC storage crucial?

Balcony power plants with battery storage raise a fundamental technical question: Should you choose AC- or DC-coupled storage? This decision affects not only the system's efficiency, but also the investment costs, compatibility with existing components, and long-term flexibility. In this article, we analyze the difference between the two storage types and consider two popular systems – Zendure SolarFlow 800 Pro and Zendure SolarFlow 2400 – in the context of this storage architecture.

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2. Technical background: What is the difference between AC- and DC-coupled storage solutions?

DC storage systems are connected directly between the solar module and the inverter. The power from the PV modules is first stored in the battery (DC) and only later converted to AC (alternating current) via the inverter when it is fed into the home grid.

AC storage systems, on the other hand, are installed downstream of the inverter. This means that the electricity is converted directly from the solar module to AC and fed into the home grid. Excess electricity is absorbed by the AC storage system – however, this requires another conversion from AC back to DC and then back to AC, which results in a loss of efficiency.

The Zendure SolarFlow 800 Pro is a typical representative of DC-coupled storage solutions, while the new model Zendure SolarFlow 2400 relies on an AC-coupled system.

3. Zendure SolarFlow 800 Pro: Compact DC storage solution with high efficiency

The SolarFlow 800 Pro offers a sophisticated system in which the battery modules (e.g., AB1000 or AB2000) are connected between the PV module and the microinverter. This minimizes energy losses by converting the power (DC to AC) only once.

Advantages of the DC concept in the 800 Pro:

• High overall efficiency due to fewer conversion steps

• Quick and easy integration into existing balcony power plants with Hoymiles or Deye inverters

• Modular battery system (expandable)

Disadvantages:

• Only works with certain microinverters

• No recharging from the network possible

• Stored energy is only fed into the grid when the sun is shining (during the day), otherwise the inverter will not be activated

4. Zendure SolarFlow 2400: Flexible AC storage with grid support

With the SolarFlow 2400, Zendure is launching a new solution that features AC coupling and grid charging capability. The system consists of a SolarFlow Hub 2400 AC, which can be operated in conjunction with up to two AB2000 batteries (4,8 kWh max.).

Strengths of the AC-based concept in the SolarFlow 2400:

• Can also be charged at night or in bad weather – thanks to mains charging (AC-In)

• Grid discharge possible: stored energy can be fed in flexibly

• Compatible with a wide range of PV systems (independent of the inverter)

Weaknesses:

• Higher energy loss due to double conversion (AC→DC→AC)

• More complex technology and possibly higher installation costs

• Larger footprint and higher weight

5. Comparison: Zendure SolarFlow 800 Pro vs. 2400 – Which system is better suited to which application?

And finally ...

For users with a clear focus on efficiency and easy integration into existing balcony power systems, the Zendure SolarFlow 800 Pro is the optimal choice. However, those seeking maximum independence and flexibility—for example, through grid charging or compatibility with various PV systems—are better advised to choose the Zendure SolarFlow 2400.

6. Conclusion: Storage type determines energy efficiency and self-sufficiency

Whether AC- or DC-coupled storage solutions, both systems have their place. The decisive factor is the specific application: Do you want to utilize as much solar power as possible without being dependent on the grid, or are you looking for a system that can be flexibly adapted to different circumstances?

With the Zendure SolarFlow 800 Pro (DC) and the new Zendure SolarFlow 2400 (AC), Zendure offers two systems, each meeting different needs. An informed decision is based on a careful analysis of your PV environment, energy consumption, and technical requirements.