Tenders are invited for Provision and Installation of Solar Power Systems for PSA Oxygen Plants at Tellewoyan and Rally Time Hospitals in Liberia The selected service provider will be responsible for: Assessment of sites to provide the drawing and BOQs for mounting structures and battery storage Designing, supplying, and installing solar PV systems at 2 sites Integrating systems with existing power infrastructure (grid/generators) Training local staff on operations and maintenance Providing documentation, warranty, and remote monitoring tools 4. Technical Specifications Component Specification Warranty PV Panels Monocrystalline solar PV panels (225 kW total; ~563 x 400W modules), 12-year product warranty, 25- year performance warranty (82%) PCS (Inverter) 90 kVA continuous, 150 kW peak, 400/230V, 50 Hz; Gridforming; Minimum 5 years full replacement warranty Battery Storage LiFePO4 (preferred), modular, 45 hours autonomy, multisource chargeable (solar, generator, grid) Minimum of 10 years ATS Integrate an ATS to enable seamless switching between solar, battery, generator, and future grid power. Mounting Structure Ground-mount fixed system, corrosion and wind resistant 10-year warranty Cabling IEC 60227 & 60502; voltage drop 2% on AC/DC sides Monitoring System Real-time analytics, alerts, data logging, remote access Enclosures IP65 or higher, climate-controlled if required Protection Devices Surge and lightning protection (DC and AC sides) 4.1 Solar Panels Type: Monocrystalline, 225 kW total; ~563 x 400W modules Product warranty: Minimum 12 years Performance warranty: By the end of the 25th year, 82% of nominal output must be achievable. Installation: The prospective contractor shall provide layout drawings and array connection diagrams to specify the installation details of the solar PV modules and the support structures. 4.2 Main Power Conversion System (PCS) The microgrid systems grid-forming PCS must provide at least 90 kVA of continuous output and 150 kW of peak power at any time, even without solar generation. The power supply must be 400/230V, 50Hz. The PSA plant to be powered by the microgrid system has a total installed power of 55 kW with an estimated peak demand of 70 kVA. The load includes a 30 kW VFD compressor and a 7.5 kW booster compressor. The maximum demand at starting is approximately 70 kVA. The plant operates 6 hours/day with an average demand of 45 kW. The solar PV system must be designed and arranged to provide power primarily to the oxygen PSA plant while also having enough capacity and flexibility to accommodate smaller secondary loads, like lighting or auxiliary equipment up to 20 kW, when the PSA plant is inactive. The system should incorporate suitable load management or switching features to redirect power effectively without affecting performance. 4.3 Battery Storage The storage system must provide enough capacity to run the PSA plant for at least 3 hours without solar generation or external power sources. The solar battery system shall be designed for easy scalability, allowing seamless storage capacity expansion through modular components or additional units, with minimal reconfiguration or downtime. Lithium iron phosphate is the preferred battery technology, but the bidding contractor could consider other technologies. 4.4 Mounting Structures The structure will be a ground-mounted, fixed system. Product warranty: The warranty must be for at least 10 years. The contractor must justify that the racking system can withstand local wind loads and environmental corrosion. 4.5 Cables All cables shall conform to IEC 60227 & IEC 60502voltage rating: 1,100V AC, 1,500V DC. The total voltage drop on the cable segments from the solar PV modules to the inverter shall not exceed 2.0%. The total voltage drop on the cable segments from the inverter to the PSA distribution board shall not exceed 2.0% 4.6 COMMs and Monitoring The system must provide a monitoring system that offers remote access to real-time operation and performance parameters and historic operating parameter logs. 4.7 System Enclosure All system components shall be housed within an outdoor enclosure rated IP54 or higher. For systems not utilising a prefabricated container, the contractor shall construct a dedicated, weatherproof building as part of this project. This building must include a climate control system that maintains operational temperatures within the manufacturers specified range. 4.8 Surge Protection Surge protection shall be provided on the DC and AC sides of the solar system. 4.9 System Integration To ensure its adaptability and reliability, the microgrid system must be able to seamlessly manage two external power sourcesa diesel generator and utility powerand automatically manage them based on energy requirements. The utility power supply will not be integrated initially, but the system must be ready to take it on without any additional changes. The PSA plants in both facilities are rated 55 kW, and the projected peak demand is 70 kVA. The backup generator specified for the PSA plant on Rallytime Hospital is 150 kVA and standbyrated. The backup generator in Tellewoyan Hospital is 165 kVA and standby-rated. 4.10 Available Area The ground array should not exceed 500 m². 5. System Standards The PV system must be compliant with the following international standards: PV system design and installation must comply with IEC 62548 The system must be tested and commissioned to IEC 62446 Solar PV system components should comply with standards and codes IEC 61215, IEC 61730 Part 1 and 2, Salt Mist Corrosion Testing As per IEC 61701. Operation grid interconnection standards like IEC 62116 (anti-islanding) and IEC 61727 (PV grid compliance). Especially when there is possible future grid interconnection. All electrical enclosures to meet IP65+ standards for dust and water resistance. Tender Link : https://plan-international.org/calls-tender/
