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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KKKPFAPXHWPMCTWM42TZXDDIEXRKAUPN/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "5CDBE0DA669C427BB8A811CFD6AEE197@KC6UQH",
    "message_id_hash": "KKKPFAPXHWPMCTWM42TZXDDIEXRKAUPN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FEXPG4RQD7ZO6OKCJGXPWK2R5QC6BZSW/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing",
    "date": "2011-08-14T05:05:39Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4NSUMODGP55HMBJSVGDNBSCQQKTBLKPB/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Dave,\nA simple switching inverter connected to the solar cells with multiple\nwindings would prevent over charging as the voltage output would be\nregulated to the voltage of a single cell and the windings providing\nisolation between cells. This would insure an equal charge to each cell\npreventing early battery failure. Using FET switches for rectification can\nboost efficiencies to over 90% even using input voltages as low as 2 Volts\nD.C. \n\nArt, \nKC6UQH\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Dave Guimont\nSent: Saturday, August 13, 2011 6:11 PM\nTo: Phil Karn\nCc: [email protected]\nSubject: [amsat-bb] Re: ARISSat-1 battery eclipse voltage decreasing\n\n\n>\n>Disclaimer: what follows is entirely my own personal opinion, not\n>necessarily that of the ARISSat-1 team or anyone else. I might be\n>missing information that would affect my analysis.\n>\n>Ken's plot is extremely valuable. It strongly suggests battery failure,\n>not a negative power budget as Tony, AA2TX suggests. Note the sharp and\n>consistent *increase* in daylight battery voltage that occurred late on\n>Aug 11, roughly coincident with sharp *decreases* of voltage during\n>eclipse and reports of computer resets and extended low power operation.\n>This is inconsistent with a negative orbit-average power budget. If that\n>were the case, the battery would never reach full charge and the voltage\n>would never rise so high.\n\nPhil,\n\nHow about you designing circuitry/program to charge \"cells\" \nindividually rather than the \"battery\".  Or has that been tried??\n\n73 Dave\n\n\n\n\n            73, Dave, WB6LLO\n                [email protected]\n\n                    Disagree: I learn....\n\n               Pulling for P3E... \n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 6374 (20110813) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 6375 (20110813) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n",
    "attachments": []
}