61 -- SOLAR ELECTRIC POWER SYSTEMS

Notice Date

September 19, 2000

Contracting Office

Regional Contracting Department (Code 201), Fleet and Industrial Supply Center, 1942 Gaffney Street, Ste 100, Pearl Harbor, HI 96860-4549

ZIP Code

96860-4549

Solicitation Number

N00604-00-T-A504

Response Due

September 22, 2000

Point of Contact

Alicia Hewett, Contracting Officer, PH: (808) 473-7546, FAX: (808) 473-0811

Description

The due date for this solicitation has been extended. Quotes must now be received no later than 3:30 p.m , HST 22 Sep 2000. Additional information from the end-user (specifications): Maximum load per day is 2905.6 watts or 363.2 watts/per hour times 8 hrs. (jamming operations). The efficiency rating of solar systems is 1.2 X 30 amps or (363.2 divded by 12VDC X 1.2) = 36 amps or 435 watts. A 400 watt system produces 33 amps per/hour or 400 watts but only for 5 hours per day. The Delta (difference) is a minimum loss of 35 watts per hr X 5 hrs and 35 + at 3 hrs. The system will run on stored charge on the batteries to make up this difference. We will not operate at maximum load on consecutive days allowing the system to recharge on the next day. Answers to some questions: Q: Who will be responsible for the assembly of the 5 solar units? Shall the bids include the contractor assembling the units at Kekaha or just providing the components to be assembled by the personnel on site? Will the components be airlifted ready-for-operation to the site? A: The Government and Government sub-contractors will be installing, we have years of experience with these types of systems. The system needs to fit inside the helicopter. The batteries, battery boxes and collector frame will probably be transported by barge from Kauai to Niihau. Hook-up instructions mut be provided. Q: When is delivery of the hardware expected by? A: We do not have a rush for these, normal production times (8-10 wks) plus shipping delays are expected. Q: This type of Sunwize system is not likely to be very stable under strong wind conditions. Who will be responsible for securing it at the site? We have other units which are wind-rated up to 100 mph without additional securing. A: We identified in our environmental requirement the strong trade winds normally hitting the islands and the salt mist for corrosion preventive measures. The mounting frame for the collectors is better than 1" angle iron. Q: The load calculations are unclear and most likely in error. Also, there is reference to power requirements in terms of "watts/week" and "watts per day" when it should read "watt-hours/day". In order to determine the size of the solar electric system, the numbers have to make sense. What is being powered by the system? A radio/telcom repeater or transmitter? What are the various modes of the repeater -- standby, sleep, jam and MTS? How many hours per day will the repeater spend in each mode? If one adds up all the hours in the energy calculations, the total is way more than the total number of hours in the week (168)? A: The system is comprised of: one data radio (modem radio). It transmits at 5 watts; one multi-purpose electronic board capable of jamming, MTS (moving target simulation) and remote power measuring. 12 VDC system (no DC/AC inverter). Data radio 5 watts per/hr at eight hours X 5 days per week, data radio sleep mode .2 watts/hr ar 16 hrs per day X 5 days plus 2 days at 24 hrs. Total 226 watts per week. Jam mode 400 watts per/hr at 8 hrs X 2 days per week, Total = 6400 watts/week or 3200 watts per day (jamming operations will be conducted twice in one week and the MTS junction is disabled during jamming). MTS mode 40 watts/hr X 8hrs x 2 days per week Total = 640 watts/week or 320/day. System overall total 7466/watts weekly. 1066 watts per day or 88.88 amps @ 12VC X 1.2 efficiency rating = 107 amps/day divide by 5 sunlight hours (based at our location on Niihau Island, Hawaii) = 21.33 amps per sunlight hour. This equals 375-400 watt system. While the system may look large we are engineering it oversized based on other anticipated loads. Q: Just to clarify, this system is a 12 VDC system only with no need for a DC-AC inverter? A: No AC inverter.

Record

Loren Data Corp. 20000921/61SOL002.HTM (W-263 SN498368)