Deye Inverter – Differentiating Between High and Low Voltage
The batteries that can be connected to Deye hybrid inverters may be either low-voltage or high-voltage types. There are several significant differences between the two. In this article, we will review these important distinctions and show how to identify the voltage category based on the manufacturer’s product code.
It is important to emphasize that there is no difference on the AC side of the two inverter types. The distinction lies in the voltage level of the connected battery pack.
Low-voltage:
These batteries have a nominal voltage of 48 V. The risk of arcing is much lower, which also reduces the likelihood of accidents or fire hazards. The batteries usually come equipped with an integrated BMS. The system efficiency is somewhat lower because, due to the lower voltage, the current levels are higher, leading to greater heat generation.
It should also be noted that thicker cables are required for connecting the batteries — again due to the higher current.
High-voltage system:
In general, a higher minimum installed capacity is required, as these systems typically start operating from a voltage level of around ~200 V and usually operate within a range of approximately 800–1000 V.
In high-voltage systems, balancing is more challenging due to the connection method, so a weaker module in the system can significantly reduce the overall capacity. However, these systems operate with higher efficiency and less heat generation.
The inverter model numbers include a designation that clearly indicates which type of unit it is.
For example, consider a 10 kW inverter. The model could be Deye SUN-SG04LP3-EU or Deye SUN-10K-SG01HP3-EUAM2.
In these model series, the last segment denotes the region, the preceding segment indicates the phase number, and the segment before that refers to the battery connection voltage level (highlighted in bold orange).
Therefore, an inverter marked with L is low-voltage (Low), while one marked with H indicates high-voltage (High).
If the batteries are already in front of you and you can see the power connectors — and there are two connectors per polarity — these are low-voltage batteries.