CORRIGENDUM No. 2 - Yap State Government

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Supply of off-grid PV solar packages including modules, batteries, electronics, wirings, etc., including transport to Yap main island. Publication Reference#: 132631 Project Title: YSPSC EFII01 SOGPVSP CLARIFICATIONS TO TENDERERS 1 Tender Clarification Requests and Responses: I. Clarification Requests/Reponses II. (Attachment) PPA/SEAIPI Off Grid PV Power Systems Design Guidelines III. (Attachment) Letter of derogation # DEVCO/H3/BD/D (2011) 1. Tender Clarification Requests and Responses: I. Clarification Requests/Reponses (a). Clarification Request #1: Annex III (Solar Batteries) As discussed with our production department on the Technical Sheet of 6V per battery requirement - "Each battery shall be a 6 volts DC (Vdc) in one robust container only, giving 6 V as nominal operating voltage; inter-cell connection shall not be exposed" - our battery is 2V per cells and provide inner-cell connector for battery bank but not produce as 6V in one robust container. Will such battery bank be acceptable Response: Yes, 6 volt or 2 volt cells will be accepted as long as the overall specifications are met. (b). Clarification Request #2: Annex III (Solar Batteries) We note that you required Flooded batteries, however will other types also be acceptable such as; GEL, ASTM, VRLA or other Response: No, only flooded batteries will be accepted. (c). Clarification Request #3: What is the exact delivery time– In the tender documents120 days as well as150 days are mentioned. Response: 120 days, refer to Article 19 of the Special Conditions. (d). Clarification Request #4: Concerning the CD that shall accompany the offer – does it have to contain only the financial offer as a pdf or all documents of the offer
Response: The CD has to contain all submitted documents from the tenderer. (e). Clarification Request #5: It is nothing mentioned about the size of the containers to deliver the goods. Are there any requirements It is also not clear about the containers whether they are only used for delivering and going back to the tenderer or if you are going to keep them Response: Only 20’ containers can be accepted in Yap harbor. The containers can go back to the tenderer. (f). Clarification Request #6: PV Module Mounting Structure Can you please clarify if we also have to supply the post/poles for the array mounting structure Response: No, the modules will be ground-mounted on a concrete structure prepared by YSPSC. It is however important to include the technical drawings of the proposed mounting structure. (g). Clarification Request #7: Charge Controllers For a SCS the charge controller is specified to be 70A at 48V. Our question is can we offer a lesser amps controller than 70A if our array voltage will be configured at higher voltage to charge the 48V battery bank via MPPT technology. Response: You can offer an alternative design that we can look into however the official proposal needs to comply with the requested specs. Note that the specifications ask for a 48 V system and 3,360 Wp. It is however, possible to parallel 2 or 3 charge controllers, if this is recommended by the manufacturer. Please refer to point e.8 of Annex II. (h). Clarification Request #8: Wires, connectors and fuses Could please specify the cable run between the PV Module to Charge controller and the cable run between charge controller and battery for the SCS Response: The tender documents ask the tenderer under point g.2 to specify the wire sizes for the SCS with the note that “All wiring must be sized to keep line voltage losses to less than two percent (2%) in each sub-circuit and to allow the circuit to operate at a maximum of 60deg Celsius within the ampacity rating of the cable.” Voltage drop calculations need to be included in the proposal. (i). Clarification Request #9: Will 12V batteries be considered as well (e.g. 12V 190Ah for SHS) 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. For now only 6V and 2V batteries will be accepted. (j). Clarification Request #10: Typically larger charge controllers (45A and above), function only as a charge controller or a load
Page 1: Supply of off-grid PV solar package
Page 5 and 6: (o). Clarification Request #15: REF
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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