📝 Description

Used end refurbished product. Diehl AKO Platinum 4300S photovoltaic inverter, manufactured by Diehl AKO Stiftung & Co. KG, exact model 4300S-EU-3P-MC4-DC. It is a single-phase ON-GRID / Grid-Tie inverter, with high-voltage photovoltaic input and 230 V AC / 50 Hz output. The Platinum 4300S series is documented as a single-phase transformer-based inverter with 1 MPPT.

⚙️ Technical Specifications

• Manufacturer: Diehl AKO Stiftung & Co. KG
• Series: PLATINUM
• Model: 4300S-EU-3P-MC4-DC
• Visible code: 739840-05
• Serial number: 0001.110131070
• Type: ON-GRID / Grid-Tie
• Phase: Single-phase
• Technology: photovoltaic inverter with low-frequency transformer
• Rated AC power: 3.68 kW
• Maximum AC power: 4.05 kW
• Maximum PV power: approx. 4.8 kWp
• MPPT: 1 tracker
• String inputs: 2, with DC connections internally connected in parallel
• MPPT range: 320–630 VDC
• Maximum DC voltage: 780 VDC
• Maximum DC current: 12.5 A
• Nominal AC voltage: 230 VAC
• Frequency: 50 Hz
• Nominal AC current: 16.0 A
• Maximum AC current: 17.6 A
• Power factor: cos φ = 1 at rated power
• Protection rating: IP54
• Operating temperature: −20…+60 °C
• Maximum temperature at rated power: approx. +45 °C
• Storage temperature: −25…+80 °C
• Maximum efficiency: approx. 95.6%
• European efficiency: approx. 94.7%
• Display: graphic LCD
• DC disconnect: integrated/optional depending on configuration; the photographed unit has the DC disconnect control
• Reverse-polarity protection: present
• Insulation/ground-fault monitoring: present
• Standards indicated: EN 50178, AS 3100; series documentation also specifies DIN VDE 0126-1-1 for the grid interface device.

⚡ Function in the Electrical System

The Platinum 4300S converts the direct current from photovoltaic modules into single-phase 230 V / 50 Hz AC, synchronized with the public electrical grid.
The inverter has one MPP tracker and two pairs of DC inputs, internally connected in parallel. The MPPT operating range is 320–630 VDC, while the maximum permitted DC voltage is 780 V. The maximum PV power specified by the documentation is 4.8 kWp, with a rated AC power of 3.68 kW and maximum power of 4.05 kW.

🏭 Construction and Installation

The Platinum 4300S uses a robust metal enclosure, with a front panel featuring an LCD display and control keypad. The photographed unit also features the characteristic black upper cover of the PLATINUM series, the large front graphic indicator and the “made in Germany” marking.
The lower section provides connections for:

• MC4 inputs for the photovoltaic field
• AC connection
• DC disconnect
• Communication interfaces
• PLATINUM Network EIA 485 connection
• RS232 service interface
  The technical documentation specifies EIA485 with two RJ45 ports, an EIA232 interface on a 9-pin Sub-D connector and a potential-free alarm contact.
  For outdoor installation, the manufacturer requires adequate protection against direct rain; the enclosure has an IP54 rating, while the communication interfaces are not included within the IP54 protection.

🌐 Communication and Monitoring

The system has a PLATINUM Network EIA485 interface, which can be used for communication between the inverter and monitoring devices of the Platinum platform.
The following are also provided:

• 2 EIA485 RJ45 ports
• RS232 9-pin Sub-D service interface
• Potential-free alarm contact
• 170 × 76 pixel graphic LCD display
• Integrated data memory with a declared capacity sufficient for approximately 30 years of operation according to the series documentation.

📊 Performance and Protections

The architecture with a low-frequency transformer and RAC-MPP technology is specific to the Platinum S family. The inverter integrates insulation monitoring, grid monitoring and reverse-polarity protection.
The series documentation also includes monitoring of grid voltage and frequency, temperature monitoring and an event memory for diagnostics.

🌐 Applications

The Diehl Platinum 4300S is primarily intended for:

• Grid-connected photovoltaic systems
• Small/medium-power residential and commercial installations
• Replacement of discontinued Platinum inverters
• Maintenance and recovery of existing photovoltaic systems
• Applications requiring single-phase PV conversion of approximately 4 kW
  The Platinum 4300S is also classified as single-phase in approved inverter lists, with a maximum AC power of 4.05 kW.

🛡️ Safety and Product Condition

The inverter is used and has normal signs of use and handling on the external structure. The enclosure, display, disconnect and connections are present in the photographs.
Operation cannot be certified from the photographs alone. To offer it as a tested inverter, it is necessary to verify at least start-up, insulation, DC input, MPP tracking, grid synchronization, AC output, display, disconnect and communications.
⚠️ The device operates with photovoltaic voltages up to 780 VDC and also has a 230 VAC output voltage. Before any intervention, both the DC and AC sides must be completely disconnected and the absence of voltage must be verified. Installation must be carried out by qualified personnel.

📦 Package Contents

• 1 × Diehl AKO Platinum 4300S
• Model 4300S-EU-3P-MC4-DC
• Complete inverter as shown in the photographs.

🚀 Final Description

The Diehl AKO Platinum 4300S is a single-phase ON-GRID photovoltaic inverter with 3.68 kW rated power and 4.05 kW maximum power, featuring 1 MPPT, 320–630 VDC PV input range, 780 V maximum DC voltage, 12.5 A maximum DC current and 230 VAC / 50 Hz output. It features 2 string inputs, a low-frequency transformer, LCD display, DC disconnect, EIA485 interface, RS232 and alarm contact.
The photographed unit's nameplate specifically confirms Diehl AKO Stiftung & Co. KG, PLATINUM, 4300S-EU-3P-MC4-DC, 3.68 / 4.05 kW, 16.0 / 17.6 A, 320–780 VDC, MPPT 320–630 VDC, 230 V / 50 Hz, IP54 and −20…+60 °C.