On-Grid Solar Panel System

Khmer Cold Chain Co., Ltd (KCC) is a third-party logistics (3PL) provider of temperature-controlled logistics (TCL) services, delivering international quality services to regional farmers, agribusinesses, food processers, pharmaceutical companies, food retailers and hotels, restaurants, caterers (HORECA), and the institutional sector at competitive prices. KCC is currently building a refrigerated cross-docking facility near the port of LM-17 on the Mekong River near Phnom Penh, Cambodia and an expansion distribution facility in downtown Phnom Penh. The company is embarking on a growth journey, and commercial operations will commence in 2023.

KCC is 100% owned by Infraco Asia Development (www.infracoasia.com) (IAD), through its wholly-owned Infraco Cold Chain Company (ICCC) Pte Ltd, a Singapore-registered subsidiary. IAD is one of the companies of the Private Infrastructure Development Group (www.pidg.org) (PIDG), a coalition of donors mobilizing private sector investment to assist developing countries in attaining infrastructure vital to boosting their economic growth and combating poverty.

KCC is seeking quotations for the design, supply, and installation of an on-grid solar panel system at the Cross Dock Facility, LM17 terminal, Kandal Province, Cambodia.

KCC is seeking quotations from solar energy specialized companies (“Contractor”) for the scope of service as detailed below.  The Contractor shall designate the contact person(s) in charge of the assignment.


Design, supply and install an on-grid photovoltaic (PV) system, roof mounted, in accordance with Cambodian laws, regulations, policies, norms, and standards related to Photo Voltaic power systems.

The selected Company will have to coordinate with Electricité du Cambodge (EDC) to get the necessary approvals before proceeding with the works.

Scope Overview:

The proposal for the on-grid PV system shall be done based on the following information:

  • Capacity of the transformer: 630 kVA (to be confirmed by PCF ASAP).
  • Roof area where the PV modules can be installed: 1000m2 –
  • Material for the PV module supports: Aluminium or Galvanised steel
  • PV modules efficiency: minimum 20.5%
  • Location of the electrical cabinet: inside the electrical room / indoor / inside the same building supporting the PV modules.
  • Testing and commissioning shall be included
  • A documented handing over, witnessed by the owner’s representative is mandatory

General Requirements:

This section outlines the minimum requirements for the project, including scope, compliance, design, and execution requirements relating to the proposed “rooftop solar” facilities planned to be constructed at the cross-dock facility, LM17 terminal, Kandal Province, Cambodia.

The Contractor shall comply with the requirements specified within this scope.

The information listed below is provided for information only. The Contractor shall be responsible for verifying the accuracy of the information.

The Contractor is responsible for the design under this contract and all information furnished by the employer shall be for purposes of information only.

The Project shall be designed in such a way that the maximum installed DC capacity does not exceed the authorized capacity allowed by the latest EDC regulations regarding on-grid solar systems and shall fit into the area available on the roof of the facility.

The detailed engineering shall comply with the requirements of the Contract including applicable laws, consents and standards, and with the technical requirements outlined as required.

The Contractor shall document the assumptions made using available wind data and any supporting material verifying the suitability of the structures and components designed for the support of the PV modules.

The Contractor shall procure, be responsible for and take care of, at its cost, the loading, unloading, transportation and logistics of all material, equipment, and tools necessary for the execution of the project, including customs clearance, if any.

The Contractor shall be responsible for care and custody of the site, the works and goods and the project until taking over.

Equipment and Systems:

The following equipment and systems, inter alia, are to be supplied by the Contractor as part of the scope of works:

  1. Solar PV modules;
  2. Inverters;
  3. Mounting structures;
  4. Cables DC and AC (low- and medium voltage), communication (if any), etc… ;
  5. Electrical protection systems, such as protection relays, circuit breakers, lock-out systems, etc.;
  6. Earthing and bonding system and conductors;
  7. All consumables for construction and operation of the system until Taking Over; and
  8. Water proofing of the tightening system to the roof


The Contractor shall liaise with the system operator (local office of the EDC) in order to prepare the approval of the design of the on-grid connected solar system.

Material Summary List:

The Contractor shall comprehensively provide the list of consumables, goods, materials and spare parts (itemised) indicating, where relevant, the following:

  1. A manufacturer’s equipment name and/or number;
  2. Item description;
  3. Quantities;
  4. Cost per item;
  5. Country of origin / supply;
  6. Identity of manufacturer; and
  7. Anticipated procurement lead-times.


The Contractor shall prepare all required documentation and manuals.

The Contractor shall make available in due time such documentation to the employer in electronic and paper form as further required in the ER.


The Contractor shall plan, manage, and conduct a training programme for the employer’s personnel. All training activities and materials shall be competently conducted / prepared in the English language.

The Contractor shall conduct a single training programme for up to five (5) personnel designated by the employer.

Training topics shall include:

  1. Site personnel safety;
  2. Emergency inverter shutdown procedure;
  3. Inverter startup procedure;
  4. O&M manual detailed review;
  5. Project operations and procedures
  6. Review site maintenance plan;
  7. Cleaning/washing process of module surface (in case of unexpected dirt) including any particular requirements for the specific module type and installation configuration;
  8. Deactivation and re-activation of all alarm systems;
  9. Failure detection and prevention; and
  10. Exemplary release of alarm and action required.

A detailed training program shall be provided by the Contractor to the employer as part of the documentation to be supplied for taking over. The program remains subject to employer’s approval.

The Contractor shall prepare and implement a health, safety and environment (HSE) plan, to be submitted to the approval of the employer. The HSE plan shall comply to the employer’s HSE plan.

The contractor can use the employer’s site office.


PV Modules:

All PV modules to be supplied for the Project shall be of the same type and from a single manufacturer. The PV module manufacturer shall comply with the following:

  • ISO 9001 — Quality management system;
  • ISO 14001 — Environmental management system; and,

The PV modules foreseen for the Project shall have valid certifications issued by reputable testing institutions according to The International Electrotechnical Commission (IEC) and other standards, such as:

  • IEC 61215: Crystalline silicon terrestrial photovoltaic (PV) modules — Design qualification and type approval;
  • IEC 61646: Thin film terrestrial photovoltaic (PV) modules — Design qualification and type approval;
  • IEC 61730 -1, -2: Photovoltaic (PV) module safety qualification, Part 1: Requirements for construction, Part 2: Requirements for testing;
  • IEC 61701:2011, Severity (6) – Salt Corrosion Testing;
  • IEC 61345: UV test for photovoltaic (PV) modules;
  • IEC 60068-2-68: Environmental testing — Part 2-68: Tests — Test L: Dust and sand;
  • Module flash test data from manufacturer, measurement according to IEC 60904- 1(2006): Photovoltaic Devices- Part-I: Measurement of Photovoltaic Current-Voltage Characteristic;
  • Potential Induced Degradation (PID) free tests performed by reputable third-party laboratories;
  • CE conformity;
  • Limited Product and Peak Power Warranty; and,
  • Safety class II.

Modules shall have a linear Peak Power Warranty (a step-like warranty shall not be accepted) and shall guarantee, as a minimum, 90% of initial peak power after 10 years and 80% after 25 years. Additionally, modules shall have a minimum product warranty of 12 years.

The minimum technical characteristics for each PV module are:

  1. Construction material: Crystalline silicon cells;
  2. Module peak power output shall be minimum 550 Wp at “Standard Test Conditions” (STC);
  3. Module shall have a positive initial power tolerance (i.e. 0~+5W)
  4. The modules shall be covered with high transparency safety glass – proven anti-reflective coating materials are preferred;
  5. The rear junction box shall be IP68, include by-pass diodes and MC4 connectors.
  6. Factory fitted module cables shall be long enough to allow the modules to be interconnected electrically in series to form strings;
  7. The PV modules shall be capable of operating under extreme ambient temperature (-10°C to +55°C) and humidity (5% to 95%) conditions and will be designed to ensure the highest possible reliability in operation and to ensure minimum and efficient required maintenance over the lifetime of the system;
  8. Each module shall permanently display a technical characteristics nameplate carrying the following information as a minimum:
    • Name of manufacturer (or monogram or symbol)
    • Type or model number
    • Serial number
    • Polarity of terminals or leads (colour coding is OK)
    • Max system voltage which module is suitable for
    • Safety class
    • Application class
    • For class A module the safety class II symbol
    • Date and place of manufacture on label or traceable from serial number
  1. Specifications for PV modules shall also be provided at “Nominal Operating Cell Temperature” (NOCT) indicating percentage power loss as a function of temperature. The percentage power loss shall not exceed 0.5% per degrees Celsius (°C) away from STC;
  2. Full current intensity – voltage characteristics (I-V curves) will be provided at 25°C for a minimum of four different levels of irradiance between 200 W/m2 and 1000 W/m2;
  3. All modules will have been electroluminescence tested at the factory and the electroluminescence images must be provided, at sufficient resolution, to the Employer;
  4. All modules shall be provided with the respective flash-test data;
  5. The PV modules must be certified for resistance to a suction pressure of 2400 Pa (Wind speed 130 km/h with safety factor 3) and an increased distributed mechanical load of 5400 Pa on the front glass surface (wind, snow and ice);
  6. In the case of framed modules, the construction of the frame of each PV module shall be adequate to allow for thermal contractions and expansions of the glass cover of the PV module;
  7. To avoid galvanic corrosion due to electrolytic action between different materials, any contact between different metals in the PV module frame must be fully electrically isolated;
  8. The active electrical components within each PV module shall be electrically insulated from the metal casing (frame), the rear cover and the front glass surface. The insulation must withstand 1000/1500 Volts DC (depending on the system voltage) between the short-circuited module output leads and the metal frame and the rear and front covers. The insulation resistance after application of this voltage for 5 seconds must be greater than or equal to 1ΜOhm;
  9. In salty environments the module shall be certified IEC 61701; and,
  10. In ammonia environments the module shall be certified IEC 61701;

The final PV module selection will be approved by the KCC.


Pure sine-wave, commercial grade string inverters shall be used.

The inverters shall have proven track records (minimum of 5 years’ operation) in terms of performance, operation, and obtaining long term debt (international project finance).

In the case of 1500 VDC inverters, the following track record requirements apply:

  • At least 1 year of documented test operation in “in-field” conditions;
  • The manufacturer must provide formal confirmation of their committed capacity either under production, on-order, delivered, or installed as an appendix to the inverter datasheet;

The inverters shall meet all relevant Laws, Consents and Standards including but not limited to the following requirements and international standards:

  1. Protection type IP (EN 60529);
  2. IEC 62109-1-2;
  3. Equipment safety and protection class (EN 50178 or IEC 62103);
  4. DC overvoltage protection;
  5. Surge protection (DIN EN 61643-11/-12);
  6. Anti-islanding protection;
  7. National/ regional requirement;
  8. CE Declaration to conformity;
  9. DIN VDE 0126-1-1;
  10. Directives 89/336/EEC, 93/68/EEC, 73/23/EEC;
  11. EMC guideline 61000-6-1, 61000-6-2,61000-6-3, 61000-6-4;
  12. Voltage guide line EN 50178; and
  13. Electrical safety IEC 60950-1


The structures shall be made from aluminium or galvanised steel.

The evaluation of the structural design of the support for PV modules shall consider the selection of permanent loads, wind loads, seismic design construction, in accordance with all applicable Laws, Consents and Standards.

The metallic supporting bases for PV modules shall be of steel components hot dip galvanized as per ISO 1461, EN 12944 or equivalent or by an appropriate anodized aluminium of heavy-duty type alloy according to the standard EN 842, 756, 768, 12 373 or equivalent for the better anti-corrosion protection of the construction.

The installation shall not require any welding to be performed at the Site.

All connections including bolts, nuts, shall be of stainless steel or compliant with other industry standard practices appropriate for the application defined ensuring no corrosion risk.

All structures shall be continuously bonded and grounded to the earthing system.

Module clamping system shall receive formal approval from the module manufacturer before commencing the installation. Sufficient space shall be left between module frames to allow for thermal expansion.

Contractor shall demonstrate that modules will remain attached to the structure under all environmental conditions reasonably expected at Site and that the maximum loading condition prescribed by the module manufacturer is not reached. No stepping of modules will be tolerated e.g. where the modules become misaligned on the tracking structure as a result of structure flex, vibration etc.

Electric Cabinet:

The LV cabinet will have the following characteristics;

  1. Protection rating of IP54 or above;
  2. Ventilation lugs to be used to prevent condensation forming inside panels if required;
  3. Type 2 surge arrestor for lightning protection, with output to be routed directly to a dedicated earthing rod and designed in accordance with Laws, Consents and Standards and the ER;
  4. Fully labelled and colour coded wiring;
  5. Appropriate number of inputs from inverters, with at least one spare connection;
  6. Circuit breaker protection on inputs from inverters;
  7. Sized according to power, voltage and number of inputs from inverters; and,
  8. Doors shall be hinged and lockable with a standard electric cabinet key;

Be constructed and installed to the Standards;

  • EMC – EN 61000-6-2, EN 61000-6-3; and,
  • CE conformity.

Operational ambient conditions are to be as follows;

  • Temperature 0°C to +55°C; and,
  • Relative humidity 5 to 95 %

The safety switches / circuit breakers to protect the electrical components against short circuits and overload must comply with the relevant parts of IEC 60898, IEC 60715 and IEC 60947.

The electrical installation has to comply with IEC 60364, and there especially with part 7-712 “Requirements for special installations or locations – solar photovoltaic (PV) power supply systems”.


The cable design and wiring for the electrical infrastructure and connection infrastructure will be in accordance with appropriate Laws, Consents and Standards, amongst others:

  1. IEC 60364 (electrical installations);
  2. IEC 60228 (conductors of insulated cables);
  3. IEC 60332-1-2 (Flame propagation);
  4. IEC 60754-1 and -2 (Gases evolved during combustion of cables);
  5. IEC 61034 (smoke density);
  6. TÜV approval 2Pfg1169 (for cables for use in PV systems).

The cable sizing criteria of the energy cables, generation DC, HV AC, LV AC and auxiliary supplies LV AC, will comply with the three cables sizing criteria:

  1. Ampacity criteria: The current carrying capacity of a cable is the maximum current that can flow continuously through a cable without damaging the cable’s insulation and other components;
  2. Short circuit criteria: In short circuit conditions the current flowing through the cable increases causing a temperature rise within the cable. Cables should be sized to withstand the largest short circuit that it is expected to see; and,
  3. Energy loss criteria: Calculation of the maximum permissible energy loss, which is the highest energy loss that is allowed across a cable. The total cable loss (DC + AC) will be limited to a maximum of 2.0%.

The maximum current must be established according to the Laws, Consents and Standards and the manufacturer information, always taking into account the type of cable and the installation methods.

Design should include the non-exhaustive list of Standards below:

  1. EN 50395;
  2. Insulation as per IEC 60364-6, IEC60364-7 and IEC 60502-1;
  3. Halogen free as per ΕΝ 50268-2;
  4. Resistance to acids and alkali, as per EN 60811-2-1;
  5. Humidity and heat test per EN 60068-2-78;
  6. Bend test under ΕΝ 60811-1-4;
  7. Impact test under ΕΝ 50305; and,
  8. Mounting hardness per DIN 53505

Thermal dimensioning of DC cables shall be based on heat load values evaluated in accordance with the manufacturers recommendations and proposed in IEC60364 or equivalent.

The cables will require supporting structures and will be strapped to cable tray (where integrated cable-ways and supports are not inherent in the design) and shall not stress the junction boxes. Cable ties are not to be used as strapping, additionally, the cable trays shall support the weight of the cable and not the straps or cable/junction box terminations. The straps shall be designed to last the full project lifetime without requiring replacement.

The cable connectors will fulfil at least the requirements of the international protection rating IP67 as defined in IEC 60529 and fulfil the safety requirements and tests of the BS EN50521:2008.

Cabling and stringing arrangements to follow inverter manuals.

The installation method chosen by the Contractor must cause no damage to cable sheaths during handling or installation and pulling forces on cables must be minimised. Minimum bending radii of cables shall be strictly followed as per the manufacturer’s recommendations and best international practice.

Cables used in the DC distribution network shall be especially designed for PV systems:

  1. Be resistant to ultraviolet (UV) radiation to HD 605/A1 as well as to ozone to ΕΝ 50396;
  2. Have an enhanced resistance to heat and fire and with low smoke emissions;
  3. Operate in an extensive temperature range;
  4. Have enhanced behaviour to friction;
  5. Be installed on the base supports of the frames lower rear (north) side, in order not to be directly exposed to solar radiation;
  6. Have a nominal / maximum (U/U0) voltage rating of 600V/1000V to AC voltage, with an equivalent DC voltage maximum rating of 1800V;
  7. Be double insulated; and,
  8. Be halogen free as per ΕΝ 50268-2.


The contractor must provide:

  • Outline of waterproofing method used to ensure no water leakage after installation;
  • Outline of chemicals and materials used for water proofing; and
  • Proof of concept for water proofing.


PV Modules:

With respect to commissioning tests for PV modules, the Contractor shall:

  1. Inspect PV Modules as installed and verify absence of any breakages, frame distortions and bending or any other signs of incorrect or incomplete installation of each PV Module;
  2. Visual inspection of the PV Modules;
  3. Verify that each PV Module string cables have been marked and numbered and are in accordance with respective cable schedules provided by the Contractor to the Owner;
  4. Inspect DC cabling between each PV Module and verify that cable types, sizes and lengths as well as cable connector types are in accordance with Schedule 1;
  5. Verify integrity of surge protection devices and all earthing connections;
  6. Verify and record the PV string voltages and compare to expected sum of nameplate voltages;
  7. Inspect and verify insulation test records on all cables and circuits;
  8. Verify correct Orientation and Inclination angles for the PV Modules; and
  9. Verify overall set-out distances, surfacing, alignment and completeness of the PV Module assembly.

Mounting Structure:

With respect to commissioning tests for the mounting structure, the Contractor shall:

  1. Verify proper alignment of mounting structure, of module rows and of inclination of modules; and
  2. Verify that all module fasteners have been installed properly.


With respect to commissioning tests for inverters, the Contractor shall:

  1. Verify that each inverter has been installed in accordance with the manufacturer’s instructions and health and safety requirements;
  2. Verify the completion of all commissioning, start-up and safety tests required by the Equipment manufacturer and operation manual;
  3. Verify adequate ventilation and cooling systems are in place for each inverter;
  4. Verify the inverter settings are compliant with the Approved Final Design,
  5. Carry out inverter start/stop tests (carried out separately on each inverter and gradually on the whole system):
    • Control of inverter connection phases;
    • Check DC voltages;
    • Check inverter operation, control systems and protections;
    • Control of isolation relays (DC and AC side);
    • Control of the inverter correct operation at the different loading conditions and at the different modes (ON and OFF, power failure, etc.);
    • Check interface protections; and
    • Verify the correct operation of the photovoltaic system.

AC Board and Switchgear:

With respect to commissioning tests for AC boards and switchgear, the Contractor shall:

  • Inspect AC cabling and switches and verify that types, sizes and lengths are in test the required disconnect thresholds of equipment and protection devices, by means of simulated intervention tests (blank tests) when possible.

Performance Test:

The Contractor shall demonstrate that the “Nominal Installed DC Capacity” of the Project, being the sum of the nameplate values of the rated power of the PV modules is according to the design.

The Contractor shall demonstrate that the overall acceptance test performance ratio is no less than 80%.


Contractor’s Documents include the following:

  • As-Built Documents;
  • Operation and Maintenance Manuals; and
  • Testing and Commissioning documents.

All Contractor’s documents shall be submitted to the employer for approval.


Outline of project work or LEAD TIME of receiving goods to be submitted.

Completion date for the project must be included with proposal – factoring in material lead-time, weather, holidays etc.


Proposal Information:

The proposal to undertake the work as described above shall include the following information:

Work Plan and Methodology:

The contractor must provide a step-by-step plan on how the project will be completed. Plan must included steps to mitigate risk – both in terms of damage to buildings, plant and material and to injuries to people working on the site.

Language of Proposal:

All proposal documents shall be prepared and submitted in English.

Documentation to be Submitted with Proposal:

  • Company information/profile, complete with references of similar projects
  • Detailed technical specification for the panels, the inverters and all other equipment, with their origin of manufacturing
  • Warranty information (PV modules, inverters, etc.).
  • Maintenance service options
  • Detailed bill of quantity
  • Validity period of the quotation

Warranty on Installation, Materials and Waterproofing:

The contractor must outline the duration and limitations of warranty on all aspects of the Project.


Proposals must be submitted no later than Submission Date stipulated below.

Late proposals will not be accepted.

Delivery Schedule:

Bidder shall prepare and submit with the proposal a complete delivery schedule suitable to provide final report and all deliverables with 3 months of release.

Proposal schedule shall include, at a minimum:

  • Workplan and timeline submittal, and final delivery schedule
  • Draft and final submittal of all deliverables
  • Customer insight Survey question submittal
  • Preliminary Client mapping name and location list
  • Draft of services for Price list for
  • Location draft, including Size, location, price (unranked)

Schedule shall include time for client review and approval cycle (5 days).


KCC intends to award a all tasks based on the proposal submitted. Firm-fixed-price contract price to accomplish the deliverables of the assignments. The price proposal shall clearly state the lump sum price for each deliverable inclusive of all out-of-pocket expenses (OPE). Proposal shall clearly state what is excluded, and identify any additional applicable costs, taxes, out of pocket expenses, or fees that are specifically excluded from the price proposal.

Fees and Payment Schedule:

The contract payments will be linked to the proposed deliverables. Milestone based payment shall be based upon acceptance and approval of each deliverable, as outlined below. Contractor should provide a proposed value for each deliverable and payment percentage of the total value.

Milestone Payment Schedule:

Instructions and Evaluation Criteria:

Award will be made to the bidder representing the best value in consideration of past performance, technical and price factors. Technical criteria are more important than cost, although prices must be reasonable and will be considered in the evaluation.

KCC reserves the right to conduct discussions with selected bidder(s) to identify the best value offer. Award of any resulting Contract Agreement shall be made by KCC on a best value basis.

KCC reserves the right to inform a bidder about requiring a bid to be withdrawn from evaluation if there is a perceived conflict of interest with the bidder and the implementation country and/or unsatisfied results from reference check and/or integrity due diligence in areas such as anti-money laundering, counter terrorism financing and anti-bribery and corruption, including undertaking anti-bribery and corruption measures in relation to proposed suppliers and associated persons as set out in the InfraCo’s Anti- Corruption Compliance Policy (available at www.infracoasia.com).

KCC intends to use its own contract template.


All prices quoted are confidential. No prices – accepted or rejected – will be shared with other prospective bidders, before, during, or after the process.

Information acquired by KCC, such as the list of RFP participants, and upon award of bid if applicable, participant contact information, must remain confidential and in no way shared with competitors or counterparts of RFP and/or bidder before, during, or after the process. This request for proposal is not an offer to do business but simply a request for information. The Company will preserve the confidentiality of any business proprietary or confidential information submitted by the Contractor, which is clearly designated as such by the Contractor, to the extent permitted by the laws of the Host Country.

Proposal submission deadline extended: 10 March 2023 (06:00 PM Phnom Penh Time)

Please submit proposals to: admin@khmercold.com


Q1. What is the watt-peak (Wp)? 

A1. The transformer size is 630Kw. The maximum solar capacity should not exceed 315 kWp.

Q2. Do you have a drawings and diagrams?

A2. Yes.  We will provide drawings and diagrams of the roof, electrical drawings and single-line diagrams (SLD) on submission of a non-disclosure agreement (NDA).  Please fill out the form and we will send the you NDA : Request NDA

Q3. When is the target commercial operation date for this facility?

A3. April 2023. However the final installation is not required until later. 

Q4.  What is the capacity of the Transformer?

A4. 630kVA

Q5. Will there be a Genset in the future?

A5. Yes – matching the transformer capacity

Q6.  Has the solar panel load been considered with the structural design?

A6. Yes

Q7. May you share the Electrical Load Calculation?

A7. No

Q8. May you also send estimated electrical consumption? 

A8. Monthly Average : 80234

Q9. Operation Hours/Schedule?

A9. The business will be operating 6 days a week.  The refrigeration units will run 24/7.

Q10. How will the ODU Compressors operate and how many compressors in total?

A10. 6 ODUs – 12 compressors – around 50%/50% (1 on / 1 stby)

Q11. What brand and model for the Compressor?

A11. See picture below:

Q12. Can you share the Structural Load Calculation Report. 

A12. No