Deye SUN-125K-PCS01HP3 bidirectional converter (125 kW)

In a large storage system, the batteries keep the energy, but someone has to convert it in both directions: from the grid current into direct current when charging and the other way round when discharging. This bidirectional converter, called PCS, does exactly that and, in addition, decides how the installation behaves: connected to the grid or on its own, when the grid goes down. It is not a product for a house, but the central component of an industrial installation, used together with the high-voltage batteries and with the MPPT and STS modules of the same Deye family.

The power of 125 kW covers the consumption of a medium-sized hall or logistics centre, and if more is needed up to 20 units are connected in parallel, reaching 2.5 MW. The maximum efficiency of 98.5% means low conversion losses, which counts twice, because the energy passes through the equipment twice: once when charging and once when discharging. It supports an overload of 110% in continuous operation and an instantaneous peak of 170%, useful when starting motors while the installation works in island mode, without the support of the grid. It weighs 70.35 kg and is 543 x 310 x 775 mm, so it is mounted on a wall or in a rack, and the IP65 enclosure allows outdoor placement.

Rated power 125 kW at 220/380 V or 230/400 V three-phase, 50/60 Hz, connection 3L+N+PE, rated AC current 189.4 A at the input and 181.2 A at the output. DC side: batteries in the 630-1000 V range, maximum charging and discharging current 220 A, on-grid, off-grid operation and transition between modes, DSP control for fast response and stability. Maximum efficiency 98.5%, overload 110% continuous and 170% instantaneous peak, IP65, intelligent forced air cooling, 543 x 310 x 775 mm, 70.35 kg. Communication WiFi, RS485, CAN and meter interface; up to 20 units in parallel, for a total power of 2.5 MW.

Who it suits

Suitable for an industrial or commercial storage project from 125 kW upwards, built on the Deye platform with high-voltage batteries, where operation without the grid is also required.

Terms explained

• PCS (bidirectional converter): The device that converts the current in both directions, in order to charge the batteries from the grid or from the panels and to discharge them back into the installation.
• Island mode (off-grid): The operating mode in which the installation breaks away from the public grid and supplies its own loads, like a small independent network.
• 170% overload: The power above the rated value that the device can deliver for a short time, needed at the moment of starting large motors.

Technical specifications

Recommended applications

• Commercial and industrial storage systems from 125 kW up to 2.5 MW
• Peak shaving and limiting the power drawn from the grid at industrial consumers
• Microgrids and backup supply for halls, farms and logistics centres
• Energy arbitrage and system services based on high-voltage batteries

Technical details

Specifications confirmed from the manufacturer's datasheet

SUN-125K-PCS01HP3 is the power conversion module (PCS) of the Deye commercial and industrial storage solution. It is a bidirectional converter that links the three-phase grid to the high-voltage battery pack, managing both charging and discharging and allowing operation in on-grid and off-grid mode and the transition between them.

The rated power is 125 kW at 220/380 V or 230/400 V three-phase, 50/60 Hz, with a 3L+N+PE connection. The rated AC input current is 189.4 A and the output one 181.2 A. On the DC side it works with batteries in the 630-1000 V range, at a maximum charging/discharging current of 220 A. It supports an overload of 110% in continuous operation and an instantaneous peak of 170%, which helps when starting motors and loads with a high inrush current in island mode. The maximum efficiency is 98.5%, obtained through DSP control that ensures fast response and system stability.

The enclosure has an IP65 protection degree and intelligent forced air cooling, dimensions of 543 x 310 x 775 mm and a weight of 70.35 kg, which allows wall or rack mounting. Communication is through WiFi, RS485, CAN and the meter interface. For large installations, up to 20 units can operate in parallel, resulting in a total power of 2.5 MW. It is used together with the MPPT and STS modules and with the high-voltage batteries of the same Deye platform.