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Photovoltaic stand-alone modular systems, phase 2The final hardware and system qualification phase of a two part stand-alone photovoltaic (PV) system development is covered. The final design incorporated modular, power blocks capable of expanding incrementally from 320 watts to twenty kilowatts (PK). The basic power unit (PU) was nominally rated 1.28 kWp. The controls units, power collection buses and main lugs, electrical protection subsystems, power switching, and load management circuits are housed in a common control enclosure. Photo-voltaic modules are electrically connected in a horizontal daisy-chain method via Amp Solarlok plugs mating with compatible connectors installed on the back side of each photovoltaic module. A pair of channel rails accommodate the mounting of the modules into a frameless panel support structure. Foundations are of a unique planter (tub-like) configuration to allow for world-wide deployment without restriction as to types of soil. One battery string capable of supplying approximately 240 ampere hours nominal of carryover power is specified for each basic power unit. Load prioritization and shedding circuits are included to protect critical loads and selectively shed and defer lower priority or noncritical power demands. The baseline system, operating at approximately 2 1/2 PUs (3.2 kW pk.) was installed and deployed. Qualification was successfully complete in March 1983; since that time, the demonstration system has logged approximately 3000 hours of continuous operation under load without major incident.
Document ID
19830027226
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Naff, G. J. (Hughes Aircraft Co. Long Beach, CA, United States)
Marshall, N. A. (Hughes Aircraft Co. Long Beach, CA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1983
Subject Category
Energy Production And Conversion
Report/Patent Number
NASA-CR-168230
NAS 1.26:168230
HAC-E8179
Accession Number
83N35497
Funding Number(s)
CONTRACT_GRANT: DE-AI01-79ET-20485
CONTRACT_GRANT: DEN3-207
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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