CORRIGENDUM No. 2 - Yap State Government

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controller, meaning that each unit does not have the capacity to control battery charge as well as load output. As the SCS system has an inverter, there is no need for the charge controller to also control the load. Thus requesting a charge controller “for a load of 70A (in 48V – 3360W)” isn’t really relevant. According to our design, a 60A charge controller is more than sufficient to manage the current from the PV array which is the primary concern when choosing such components. Please specify whether this will be acceptable. Response: No, the specs need to comply with the technical tender document. We have left a window open to send besides the offer that follows the set specification to propose and alternative design. (k). Clarification Request #11: Will 24V nominal panels with 72 cells be considered Typically panels that are larger than 130W are 24V with 72 cells, and the requirements have allowed panels up to 185W. Response: No, the specs need to comply with the technical tender document. We have left a window open to send besides the offer that follows the set specification to propose and alternative design. (l). Clarification Request #12: For the SHS will 12V designs be considered If there are 12V DC loads to be used with the system, such as lights, then a system voltage of 12V would be beneficial and eliminate the need of a DC to DC converter within the system. It also opens up the range of inverters, as 24V 300W inverters are more difficult to find that 12V 300W inverters. Response: No, the specs need to comply with the technical tender document. We have left a window open to send besides the offer that follows the set specification to propose and alternative design. It is however possible that YSPSC might go for the 12V option therefore the charge controllers need to be able to work with 12V and with 24V. (m). Clarification Request #13: Regarding the panel warranty and the following excerpt from Annex II; The PV modules shall be warranted for at least 20 years and must not experience more than 15% of rated capacity reduction in output over their lifetime. They also shall be warranted for physical defect for a period of 10 years. Typically modules are supplied with 5 year physical defect warranty and 20 or 25 year warranty for a reduction in power output no greater than 20%. Please specify whether this standard warranty will be accepted If not please recommend a supplier offering a warranty for rated capacity reduction in output of only 15%. Response: The specifications are the basis of warranty guidelines that are to be met. However alternative warrantees shall be noted and will be considered but perhaps lead to a lower rating in the evaluation process if higher warrantees are offered by other tenderers. As per contract guidelines recommendations of specific suppliers meeting this warranty are not allowed. (n). Clarification Request #14: For the SHS both 10mm2 and 6mm2 cables have been specified, please state whether these are required to be double or single core cables Response: The SHS 10mm2 and 6mm2 cables are to be provided as per the specifications of “Annex II g.) wires, connectors and fuses” and “Annex III 1.8 Wires, connectors and fuses – Ref to g.)” and shall be standard and flexible insulated single core copper cables.
(o). Clarification Request #15: REFERENCE IS MADE TO TECHNICAL SPECIFICATIONS ITEM 1.2 AND ITEM 2.2 (MOUNTING RAILS): Please clarify how the mounting rails should be done. Have they to be deemed for ground mounting or roof mounting In case of ground mounting please clarify if a steel or aluminium pole must be supplied. Response: The tender dossier states that the panels will be ground mounted – see Annex II-specifications b.2 and b.3. No poles need to be provided as the footing (poles) will be made of concrete and completed by YSPSC. The tenderer will have to send, however, their technical drawing of the mounting structure they propose. – see Annex II-specifications b.3. (p). Clarification Request #16: REFERENCE IS MADE TO TECHNICAL SPECIFICATIONS: Please clarify if the inverters and charge controller must be mounted on an electrical control board. If so should the supplier deliver them pre-mounted on the electrical board or the end users will take care of mounting Moreover, in case of electrical board are to be supplied which kind of electrical board do you need Which would be the IP protection number Response: The design of the PV system is up to the tenderer and the most appropriate design will be selected. Please note that we follow the technical guidelines for the pacific islands for the design, find attached a copy of these guidelines. (q). Clarification Request #17: REFERENCE IS MADE TO TECHNICAL SPECIFICATIONS Should the bidder supply earth grounding with earth rod Response: Yes, see technical guide and the NEC electrical code for off-grid PV installations. (r). Clarification Request #18: REFERENCE IS MADE TO THE TENDER SCOPE: Does the contract include installation or only delivery CIF In case the contract includes installation please send us the list of installation sites. Response: No installation is required under this tender. (s). Clarification Request #19: REFERENCE IS MADE TO INVERTERS QUANTITY: Please confirm that inverter quantities is 400 and -in any case - a 10% extra inverter must be included as spare parts Response: The requested quantity is 400 Sinewave inverters 24Vdc 120 Vac 60Hz 300W plus 10% spares and 20 Sine wave inverter 48Vdc 120Vac 60Hz 3000W plus 10% spares (t). Clarification Request #20: Rules of Origin: Clause 3 of Instructions to Tenderers. Please provide list of countries applicable for this project. Could you provide us with the copy of the Reference note of derogation # DEVCO/H3/BD/D (2011) Response: See the attached copy of the “Letter of Derogation”:
Page 1 and 2: Supply of off-grid PV solar package
Page 3: Response: The CD has to contain all
Page 7 and 8: (bb). Clarification Request #28: So
Page 9 and 10: Response: The tender dossier requir
Page 11 and 12: OFF GRID PV POWER SYSTEMS SYSTEM DE
Page 13 and 14: INTRODUCTION Four major issues aris
Page 15 and 16: In the worked example on the previo
Page 17 and 18: selected, as battery capacity varie
Page 19 and 20: Therefore the required PV array out
Page 21 and 22: INVERTER SIZING The selected invert
Page 23 and 24: • Manufacturer’s Tolerance: Mos
Page 25 and 26: Table 5 Minimum Nominal Array Volta
Page 27 and 28: Nuku'alofa, Tongatapu, Tonga Jan Fe
Page 29 and 30: 29° Tilt ² 5.57 5.22 5.3 5.49 5.4
Page 31: III. (Attachment) Letter of derogat

CORRIGENDUM No. 2 - Yap State Government

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