Solar Charge Controllers and DC Power Systems
Delta Eltek 2U / 3U Solar Shelf Extension Kit (6.4kW / 12.8kW)
The Delta Eltek Solar Extension Shelves provide a compact and engineered solution for integrating solar PV input into new or existing Flatpack2 and Flatpack S DC power systems. Available in two configurations — a 2U shelf supporting up to 6.4kW and a 3U shelf supporting up to 12.8kW of installed PV — each is designed to house the Flatpack2 48/32...
Read MoreThe Delta Eltek Solar Extension Shelves provide a compact and engineered solution for integrating solar PV input into new or existing Flatpack2 and Flatpack S DC power systems. Available in two configurations — a 2U shelf supporting up to 6.4kW and a 3U shelf supporting up to 12.8kW of installed PV — each is designed to house the Flatpack2 48/3200 HE Solar Converter (MPPT) modules.
These extension shelves provide hot-pluggable slots for MPPT modules, PV isolators, optional DC surge protection devices (SPDs), and a dedicated PV connection panel equipped with MC4 connectors. Designed for use within both indoor and outdoor enclosures, they simplify the addition of solar energy into hybrid or standalone telecom and industrial energy systems.
Powerbox Australia offers system design guidance, integration support and local stock, to help you deploy Delta Eltek solar power solutions with confidence. Contact us today!
Show Less
Model:
or send a quick enquiry about this product only
Features
- Built for Hybrid & Off-Grid Sites: Supports solar autonomous systems or hybrid setups alongside diesel or grid power, ideal for remote telecom locations.
- Expandable Power Options: Choose between 2U (up to 2 modules / 6.4kW) or 3U (up to 4 modules / 12.8kW) configurations to match your load demands.
- Integrated PV Connectivity: Includes MC4 connectors, front/rear access, and 2-pole service switches for easy, standards-compliant PV array integration.
- Hot-Pluggable Solar Chargers: Enables live installation or replacement of Flatpack2 HE solar modules without system downtime.
- Advanced MPPT & Protection: Delivers fast and reliable solar harvesting with earth fault detection, reverse polarity protection, and optional DC SPD.
- Optimised for Telecom Applications: Perfect for radio base stations, cell sites, broadband nodes, and FTTx infrastructure requiring reliable solar backup.
Specifications
| MANUFACTURER PART NUMBER | ||
|---|---|---|
| Model | 2U Solar Extension Kit (6.4 kW) | 3U Solar Extension Kit (12.8 kW) |
| Manufacturer Part Number | CTZ00000.1358 | CTZ00000.1255 |
| POWER MODULES | ||
|---|---|---|
| Model | 2U Solar Extension Kit (6.4 kW) | 3U Solar Extension Kit (12.8 kW) |
| Flatpack2 Solar Charger (1) | Flatpack2 48/3200 HE Solar | |
| Peak efficiency | 97% | |
| Max no. of modules | Up to 2pcs | Up to 4pcs |
| Note | 1) See Flatpack2 Solar charger datasheet for details | |
| INPUT DATA (SOLAR CHARGER) | |
|---|---|
| Voltage (operating range) | 85-420Vdc |
| Voltage (MPPT range) 2) | 100-380Vdc |
| Voltage (start-up) | 150Vdc |
| Maximum current | 20.3Adc |
| Protection | Fuse, varistor for transient protection, reversed polarity, shutdown when VIN is too low, earth fault check during start-up |
| Note | 2) At nominal output voltages. MPPT will operate down to 100V, but the maximum input current limitation will de-rate maximum output power |
| PV CONNECTION PANEL | ||
|---|---|---|
| Model | 2U Solar Extension Kit (6.4 kW) | 3U Solar Extension Kit (12.8 kW) |
| Service switches for PV arrays | 2 pcs 2-pole | 4 pcs 2-pole |
| MC4 connectors | 4 pcs (2 pcs per one PV array) | 8 pcs (2 pcs per one PV array) |
| DC SPD (option) | Up to 2 pcs (Type 1+2) | Up to 4 pcs (Type 2) |
| OUTPUT DATA | ||
|---|---|---|
| Model | 2U Solar Extension Kit (6.4 kW) | 3U Solar Extension Kit (12.8 kW) |
| Voltage (default) | 53.5Vdc | |
| Voltage (adjustable range) | 42 (3) - 57.6 VDC | |
| Max power, VIN ≥ 170Vdc | 6400 W | 12800 W |
| Max current, @VOUT = 48Vdc | 133 A | 266 A |
| Protection | Overvoltage shutdown, short circuit proof, high temperature, hot plug-in inrush current limiting | |
| Note | (3) Stand-by / test operation (VOUT < 48 VDC) limited for VIN > 250 VDC | |
| ALARMS & WARNINGS | |
|---|---|
| Alarms (Red LED) | High and low temperature shutdown, Converter Failure, Overvoltage shutdown on output, Fan failure, Low voltage alarm, CAN bus failure |
| Warnings (Yellow LED) | Low input voltage, Converter in power derate mode, Remote current limit activated, Input voltage out of range, flashing at overvoltage |
| Normal (Green LED) | Input and output ok |
| ENVIRONMENT | |
|---|---|
| Operating temperature | -40 to +75 °C [-40 to +167 °F] (3) |
| Storage temperature | -40 to +85 °C [-40 to +185 °F] |
| Note | (3) Stand-by / test operation (VOUT < 48 VDC) limited for VIN > 250 VDC (4) +45 to +75 °C [+113 to +167 °F] with de-rated performance |
| MECHANICAL | ||
|---|---|---|
| Dimensions (W x D x H) (5) | 482 x 384 x 89 (2U) mm | 482 x 384 x 133 (3U) mm |
| Weight (excluding modules) | Approximately 7 kg | Approximately 10 kg |
| Note | (5) Recommended minimum cabinet depth is 400 mm [15.7 inch] | |
| DESIGN STANDARDS | |
|---|---|
| Electrical safety | EN 60950-1:2006/A2:2013, EN 62368-1:2020/A11:2020, EN 62109-1:2010/-2:2011 |
| EMC | ETSI EN 300 386 v1.3.2 EN 61000-6-1:2019, EN 61000-6-2:2019, EN 61000-6-3:2007/A1:2011/AC:2012, EN 61000-6-4:2019 |
| Environment | ETSI EN 300 019-2-1 v2.3.1:2017 (Class 1.2) ETSI EN 300 019-2-2 v2.4.1:2017 (Class 2.3) ETSI EN 300 019-2-3 v2.4.1:2015 (Class 3.2) ETSI EN 300 132-2 v2.6.1:2019 Normal operating conditions as per IEC 62040-5-3:2016 clause 4.2. Other operating conditions as per IEC 62040-5-3:2016 clause 4.3, must be advised |
Warranty & Returns
Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.
FAQs
The 2U kit supports up to 2 Flatpack2 48/3200 HE Solar modules and a maximum PV input of 6.4kW, while the 3U kit supports up to 4 modules and up to 12.8kW — both using the same 85–420Vdc input range and 53.5Vdc output. Choose the 2U for smaller or initial-stage deployments; choose the 3U where higher PV capacity or future expansion is required from day one.
Each shelf accepts a PV input voltage of 85–420Vdc, with an MPPT operating range of 100–380Vdc and a start-up voltage of 150Vdc. Maximum input current per module is 20.3A. The default output voltage is 53.5Vdc (adjustable 42–57.6Vdc), with the 2U shelf delivering up to 6400W and the 3U shelf up to 12800W when PV input is ≥170Vdc.
The shelves are designed specifically for Delta Eltek Flatpack2 and Flatpack S DC power systems and are engineered to house the Flatpack2 48/3200 HE Solar Converter (MPPT) modules. They can be integrated into new builds or retrofitted into existing compatible Flatpack2 enclosures, supporting both indoor and outdoor cabinet installations — making them well suited for telecom site expansions without a full system replacement.
Hot-pluggable design means the Flatpack2 HE Solar modules can be installed, replaced, or removed while the system remains powered and operational — eliminating the need for system shutdown during maintenance or module swap. This is particularly valuable on remote telecom sites or critical infrastructure where any unplanned outage has significant downstream impact.
The Flatpack2 48/3200 HE Solar modules include fuse and varistor transient protection, reverse polarity protection, overvoltage shutdown, short-circuit protection, high-temperature shutdown with fan failure alarm, earth fault detection at start-up, and low input voltage shutdown. LED status indicators (red for alarms, yellow for warnings, green for normal operation) provide at-a-glance system health monitoring.
Both shelves operate across a temperature range of –40°C to +75°C, making them suitable for harsh Australian outback and remote site conditions. The 2U shelf measures 482 × 384 × 89mm and weighs approximately 7kg; the 3U shelf measures 482 × 384 × 133mm at approximately 10kg. A minimum cabinet depth of 400mm is required. Each shelf includes MC4 connectors and 2-pole service switches per PV array string.
The Delta Eltek Solar Extension Kit complies with EN 60950-1, EN 62368-1, EN 62109-1/-2 for electrical safety; ETSI EN 300 386 and EN 61000-6 series for EMC; and ETSI EN 300 019 Class 1.2, 2.3, and 3.2 for environmental conditions — all standard requirements for Australian and international telecom infrastructure deployments. The system is specifically optimised for radio base stations, cell sites, broadband nodes, and FTTx infrastructure.
Powerbox Australia holds local stock and provides system design guidance and integration support for Delta Eltek solar power solutions. Contact our team at sales@powerbox.com.au or 1800 251 380 to discuss your site requirements, load calculations, PV array sizing, and enclosure selection.
Related Products
Delta Eltek Flatpack2 48/3200 HE Solar Module (MPPT)
- Delivers up to 3200W output power with 97% peak efficiency
- MPPT tracking for optimal solar panel utilisation under variable conditions
- Fully integrated into Eltek Smartpack and Flatpack2 control systems
- Hot-swappable design for fast deployment and field replacement