📝 Description

Used product. Diehl AKO / Platinum photovoltaic inverter for connection to the electrical grid, identified on the nameplate as 31C-S-IT-3P-MC3 / 716 828. The available commercial and technical documentation associates this configuration with the Platinum 3100S family, with a rated AC power of 2,800 W.

⚙️ Technical Specifications

• Type: ON-GRID / Grid-Tie
• Phasing: Single-phase
• Rated power: 2,800 W
• Maximum PV power: approx. 3,200–3,450 Wp, depending on the variant/documentation; for this unit, reference should preferably be made to the nameplate for the electrical limits.
• MPPT: 1 tracker
• DC voltage indicated on nameplate: 300–750 VDC
• MPP voltage: Platinum S series documentation specifies an operating range in the order of 313/314–630 VDC for models in this family; the unit's nameplate instead shows 300–750 VDC as the DC voltage.
• Maximum DC voltage: 750 VDC, according to the nameplate.
• Rated AC current: 10.8 A
• AC voltage: 230 VAC
• Frequency: 50 Hz
• Protection: IP54
• Temperature range indicated on nameplate: −20…+55 °C
• Protection class: Class I
• Standard indicated: EN 50178
• Marking: CE
• Construction: Made in Germany
  The Platinum S documentation also confirms 1 MPPT, RAC-MPP technology, insulation monitoring and grid monitoring according to the configuration specified for the series.

⚡ Function in the Electrical System

The Diehl Platinum converts the direct current from photovoltaic modules into single-phase 230 V / 50 Hz AC, synchronized with the electrical grid. It is therefore intended for grid-connected photovoltaic systems, not stand-alone systems.
The MPP regulation allows the maximum power point of the PV generator to be tracked. The series documentation also specifies grid monitoring, insulation monitoring and an ENS system according to the configuration provided.

🏭 Construction, Connections and Communication

The inverter has an LCD display and front keypad for displaying data and managing operating information.
The following are clearly visible on the communication side:

• RS485
• RS232
• RJ45 connectors for communication
• Interface identified as PLATINUM Network
• Dedicated connections for inverter service and communication.
  The technical documentation for the series specifies EIA-485 with 2×RJ45, an EIA-232 Sub-D9 interface and a programmable potential-free contact.
  The system uses PV connections with MC3 connectors, consistent with the MC3 designation shown on the nameplate.

🌐 Installation and Applications

The IP54 enclosure allows installation indoors and outdoors protected from direct precipitation. The series manual specifies that adequate overhead protection must be provided for outdoor installations; furthermore, the IP54 rating should not be considered applicable to the digital interfaces.
Applications:

• ON-GRID photovoltaic systems
• Residential and small commercial installations
• Replacement of Diehl Platinum inverters from the same family
• PV systems with a generator compatible with the device's DC voltage range

🛡️ Safety and Product Condition

The unit is used, with normal cosmetic and usage marks visible on the external structure. The photographs also show the rear compartment with the RS485/RS232 connections, connectors and ventilation openings.
Before installation, PV field compatibility, string open-circuit voltages, polarity, insulation, DC/AC protection and compliance with the local grid must be verified.
⚠️ WARNING: the inverter operates with DC voltages up to 750 V and with 230 VAC. Installation, opening and testing must be carried out exclusively by qualified personnel.

📦 Package Contents

• 1 × Diehl AKO Platinum 3100S / 31C-S-IT-3P-MC3
• Code/model shown on the nameplate: 716 828
• Visible Serial No.: 0001.080815025

🚀 Final Description

The Diehl Platinum 3100S is a 2.8 kW single-phase ON-GRID photovoltaic inverter, manufactured in Germany, with 1 MPPT, high-voltage PV input, 230 VAC / 50 Hz output, IP54 protection, LCD display and RS485/RS232 interfaces. The unit's nameplate precisely identifies the configuration as 31C-S-IT-3P-MC3 / 716 828, with 300–750 VDC, 10.8 A AC and an operating temperature of −20…+55 °C. The Platinum S series is documented as an inverter with RAC-MPP technology, grid monitoring and insulation monitoring.