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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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12VDC inverter system
We have a customer who owns a series of 24 and 30 unit apartment
buildings. Presently on each floor as per local requirements there are several self contained emergency lighting units. Some of these are equipped with a small 6V battery and just two low voltage lamps that aim in different directions down the hallway, while other larger units having larger batteries sometimes might have as many as six 12volt lamps wired remotely. These all are equipped with sealed lead acid rechargeable batteries which need to be replaced every few years. Two of his buildings are exceptions though and don’t have this type of lighting. In these buildings, the hallway lighting circuit is wired through an inverter system. This system, which was built by a company in Massachusetts many years ago is installed in the boiler/electrical room, and consists of two 12VDC to 120VAC 450W solid state inverters operating in parallel and two group 24 size wet cell automotive batteries. There is a built in charger and a huge contactor which drops out upon loss of AC and applies 12VDC to the inverters. Loss of AC will cause the load to toggle over to the inverter outputs and the hallway lighting circuit remains powered. Maintenance on these two buildings is minimal and his ultimate cost savings projection becomes significant when multiplying installing this type of system into the 100’s of buildings which he presently owns. He has asked me to look into finding this type of equipment for him to retrofit his other buildings. The typical load is about 400W CFL and will probably never exceed 550W. I don’t know how picky these particular 13W CFL units are to anything other than sine wave AC. I know sine wave or even modified sine wave will probably increase cost somewhat. Does anyone have any ideas for inverter systems equipment they might be able to share with me? Thanks, Lenny. |
#2
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12VDC inverter system
On Jun 4, 8:13 am, "
wrote: We have a customer who owns a series of 24 and 30 unit apartment buildings. Presently on each floor as per local requirements there are several self contained emergency lighting units. Some of these are equipped with a small 6V battery and just two low voltage lamps that aim in different directions down the hallway, while other larger units having larger batteries sometimes might have as many as six 12volt lamps wired remotely. These all are equipped with sealed lead acid rechargeable batteries which need to be replaced every few years. Two of his buildings are exceptions though and don’t have this type of lighting. In these buildings, the hallway lighting circuit is wired through an inverter system. This system, which was built by a company in Massachusetts many years ago is installed in the boiler/electrical room, and consists of two 12VDC to 120VAC 450W solid state inverters operating in parallel and two group 24 size wet cell automotive batteries. There is a built in charger and a huge contactor which drops out upon loss of AC and applies 12VDC to the inverters. Loss of AC will cause the load to toggle over to the inverter outputs and the hallway lighting circuit remains powered. Maintenance on these two buildings is minimal and his ultimate cost savings projection becomes significant when multiplying installing this type of system into the 100’s of buildings which he presently owns. He has asked me to look into finding this type of equipment for him to retrofit his other buildings. The typical load is about 400W CFL and will probably never exceed 550W. I don’t know how picky these particular 13W CFL units are to anything other than sine wave AC. I know sine wave or even modified sine wave will probably increase cost somewhat. Does anyone have any ideas for inverter systems equipment they might be able to share with me? Thanks, Lenny. How bout salvaging some old computer UPS from the local dump or advertize to relieve folks of their defunct units for recycling al |
#3
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12VDC inverter system
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#4
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12VDC inverter system
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#5
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12VDC inverter system
" wrote: We have a customer who owns a series of 24 and 30 unit apartment buildings. Presently on each floor as per local requirements there are several self contained emergency lighting units. Some of these are equipped with a small 6V battery and just two low voltage lamps that aim in different directions down the hallway, while other larger units having larger batteries sometimes might have as many as six 12volt lamps wired remotely. These all are equipped with sealed lead acid rechargeable batteries which need to be replaced every few years. Two of his buildings are exceptions though and don’t have this type of lighting. In these buildings, the hallway lighting circuit is wired through an inverter system. This system, which was built by a company in Massachusetts many years ago is installed in the boiler/electrical room, and consists of two 12VDC to 120VAC 450W solid state inverters operating in parallel and two group 24 size wet cell automotive batteries. There is a built in charger and a huge contactor which drops out upon loss of AC and applies 12VDC to the inverters. Loss of AC will cause the load to toggle over to the inverter outputs and the hallway lighting circuit remains powered. Maintenance on these two buildings is minimal and his ultimate cost savings projection becomes significant when multiplying installing this type of system into the 100’s of buildings which he presently owns. He has asked me to look into finding this type of equipment for him to retrofit his other buildings. The typical load is about 400W CFL and will probably never exceed 550W. I don’t know how picky these particular 13W CFL units are to anything other than sine wave AC. I know sine wave or even modified sine wave will probably increase cost somewhat. Does anyone have any ideas for inverter systems equipment they might be able to share with me? Thanks, Lenny. news:alt.engineering.electrical would be a better place to ask. -- http://improve-usenet.org/index.html If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm Sporadic E is the Earth's aluminum foil beanie for the 'global warming' sheep. |
#7
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12VDC inverter system
Arfa Daily wrote: "PhattyMo" wrote in message ... wrote: We have a customer who owns a series of 24 and 30 unit apartment buildings. Presently on each floor as per local requirements there are several self contained emergency lighting units. Some of these are equipped with a small 6V battery and just two low voltage lamps that aim in different directions down the hallway, while other larger units having larger batteries sometimes might have as many as six 12volt lamps wired remotely. These all are equipped with sealed lead acid rechargeable batteries which need to be replaced every few years. Two of his buildings are exceptions though and don’t have this type of lighting. In these buildings, the hallway lighting circuit is wired through an inverter system. This system, which was built by a company in Massachusetts many years ago is installed in the boiler/electrical room, and consists of two 12VDC to 120VAC 450W solid state inverters operating in parallel and two group 24 size wet cell automotive batteries. There is a built in charger and a huge contactor which drops out upon loss of AC and applies 12VDC to the inverters. Loss of AC will cause the load to toggle over to the inverter outputs and the hallway lighting circuit remains powered. Maintenance on these two buildings is minimal and his ultimate cost savings projection becomes significant when multiplying installing this type of system into the 100’s of buildings which he presently owns. He has asked me to look into finding this type of equipment for him to retrofit his other buildings. The typical load is about 400W CFL and will probably never exceed 550W. I don’t know how picky these particular 13W CFL units are to anything other than sine wave AC. I know sine wave or even modified sine wave will probably increase cost somewhat. Does anyone have any ideas for inverter systems equipment they might be able to share with me? Thanks, Lenny. CFL's _Shouldn't_ be picky about power. They are usually always rectified to DC inside.Sine,Square,sawtooth even-it doesn't matter to the rectifier. I'm not too convinced by that argument. The inverter squeezed into the base of these lamps, is by necessity very small, which only allows for a filter cap of around 10uF. It is often this cap that fails in these lamps, so clearly, it is stressed already, by the heat, and the job it's trying to do filtering the raw DC from the reccy. I reckon that if you start hitting it with a real bad shaped waveform, it might be just a bit too much for it. Bear in mind also that these things are inherently electrically noisy, and only just about squeeze by the RF emission regs - at least here in the UK - with a sine wave going in. With a rough wave being supplied, they might just kick up enough radiation, to cause a problem. Arfa A lot of these low wattage CFLs where the ballast is part of the fixture still use magnetic choke ballasts. In my experience they do still work on inverters, but they tend to buzz and are more reluctant to start. |
#8
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12VDC inverter system
snipped story about inverters for emergency lighting
You might find it helpful to look about RV supply places. There are a number of (often somewhat spendy, unfortunately) inverter/charger units available that do it all automatically and have decent sine wave outputs. Basically, they just hook up to the AC input, battery, and output, and will charge the battery as needed when AC is around and automatically switch over to inverter mode when AC is removed--essentially a UPS circuit, really. I'd trust them to work reliably in an emergency more than I'd trust a cheap no-name inverter. -- Andrew Erickson "He is no fool who gives what he cannot keep to gain that which he cannot lose." -- Jim Elliot |
#9
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12VDC inverter system
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