OT -- off grid power systems

What's that Lassie? You say that snipped-for-privacy@nowhere.org fell down the old rec.crafts.metalworking mine and will die if we don't mount a rescue by Mon, 29 Mar 2010 12:15:40 -0700:

If you had a grid tie system that won't let you generate independently of the grid, could you run a small generator to simulate a live grid?

You would need to use the usual transfer switch to cut out the dead utility grid, then start the generator. The grid tie inverters would then 'see' a live "grid".

Reply to
dan
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And NiCads have memory.

Mart> >> ...

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I can buy deep-discharge lead acid batteries for

Reply to
Martin H. Eastburn

Only when their charging is abused. This belief came from early failures aboard satellites and was traced to the very controlled charge/discharge cycles which damaged the cells.

Reply to
Michael A. Terrell

Caused by widespread misunderstanding of how to handle them in a circuit design.

See the ³Video Battery Handbook² from Anton Bauer: .

Joe Gwinn

Reply to
Joseph Gwinn

They charged when the spacecraft was in sunlight and discharged when it passed through Earth's shadow, so the cycle was exactly the same for each orbit. Memory is difficult to recreate in the lab.

jsw

Reply to
Jim Wilkins

On Tue, 30 Mar 2010 07:29:19 -0400, the infamous Joseph Gwinn scrawled the following:

That link flaked on me (defaulted to 'choose country' map) but I was able to find the ebook. Good one, Joe.

The Dionic 160 warning was eye-opening, too. Our gov't, in its ultimate wisdom, can forbid the boarding of a plane with those dangerous, exploding lithium type batteries unless specific rules are followed to the letter. From the DOT manual:

"All batteries, wet, dry, nonspillable, and lithium, must be securely packaged with the equipment in such a way that prevents the dangerous evolution of heat and protects against short circuits, or the batteries must be properly installed in the equipment. Properly cushion items to prevent shifting. The equipment must be designed, packaged, and be in proper condition so that no dangerous evolution of heat, fumes, gases, or fire will result. Leave devices in the ?off? position. The device may not operate on its own or short circuit the battery in it. This can be achieved by engaging a trigger lock or disabling the power button/ switch. Batteries may not be recharged during transportation. Batteries packed in equipment may not exceed certain weight limits: Lithium batteries in equipment: 5kg net (passenger air/rail), 35kg net (cargo air) Lithium batteries packed with equipment: 5kg net (passenger air/rail),

35kg gross (cargo air) Wet batteries: 30kg gross (passenger air/rail), no limit by cargo air Dry batteries and Nonspillable batteries: no limit Important sections pertaining to batteries installed in and packaged with equipment: §§ 172.102, (Special Provisions 134, 157, 188, 189, A101, A103, and A104), 173.185(b) and (c ), and 173.220(d)."

Note the requirement of a TRIGGER LOCK. Are these f**ks paranoid, or what?

-- Everything I did in my life that was worthwhile I caught hell for. -- Earl Warren

Reply to
Larry Jaques

...

I believe that means two separate actions are needed to activate the switch, rubbing against something isn't enough. My chain saw has one that's like the grip safety on a 1911.

I test batteries, sometimes to destruction. Those regulations aren't unreasonable. Aircraft rules attempt to minimize the fuel ignition risk in a crash, which can occur without warning on takeoff or landing. The Concorde is an example.

You should see how the fire department responds to an alarm at Segway, because of all the lithium batteries there.

jsw

Reply to
Jim Wilkins

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