Digest for sci.electronics.repair@googlegroups.com - 7 updates in 4 topics

Cydrome Leader <presence@MUNGEpanix.com>: Jul 03 07:11AM

> I don't see a problem with this. Is my scheme OK?
> Thanks,
> Eric
 
That depends on the timing of the switches to the positions of the
transfer switch. My guess here is they will transition when the transfer
switch is FULLY on in either generator or utility position. This would
jive with your you're trying to do. Indicating something like "in the
middle of switching" would be pretty useless, and something the controller
could detect itself.
etpm@whidbey.com: Jul 03 08:44AM -0700

On Fri, 3 Jul 2020 07:11:40 +0000 (UTC), Cydrome Leader
>jive with your you're trying to do. Indicating something like "in the
>middle of switching" would be pretty useless, and something the controller
>could detect itself.
 
The question is moot now. The panel passed inspection. Even got the
green sticker on the main panel to prove it.
Eric
Veek M <veek@dont-use-this.com>: Jul 03 03:07PM

http://www.agnesbattery.com/sfindustrial/stanqueen.html
 
For a 12V 150AhC10 battery - we charge at 10%, 15A till the voltage/cell
reaches 2.36V.
 
So why do we have this 'Minimum Ah input During Initial Charge' setting?
In another spec it says:
 
"Minimum Ah input 450% of C10 capacity" for a 200Ah C10 battery.
----
450% is something like 900Ah or 4.5 times the base Ah.. wth?
Veek M <veek@dont-use-this.com>: Jul 03 03:34PM

On Fri, 03 Jul 2020 15:07:53 +0000, Veek M wrote:
 
 
> "Minimum Ah input 450% of C10 capacity" for a 200Ah C10 battery.
> ----
> 450% is something like 900Ah or 4.5 times the base Ah.. wth?
 
Assuming he means some kind of absolute minimum charging current.. how
would that make sense because the battery starts charging at 10% of C10Ah
which is huge.. 15A..
 
Also, if the battery is comprised of numerous cells (12V-nominal/2.36Vpc
gives the total cells - 5 cells in series.) So 15A is the charge current
to all the cells.. ergo..
 
(and another Q, how does he check the per-cell voltage is 2.36V because
if they are in series.. does he just assume when he sees 12V across all
of them?)
root <NoEMail@home.org>: Jul 03 01:04PM

My Garmin Foreerunner uses a chest belt to capture pulse.
The belt broke and I would like to try to glue it together
with a conductive cement. I see there are conductive
epoxy glues and I would like comments on your experience
with such.
 
Thanks.
Cydrome Leader <presence@MUNGEpanix.com>: Jul 03 07:24AM


> Industrial correction could be split between at some motors and at the
> service.
 
> It is not cost effective to put all correction at motors.
 
Agreed. One larger switchable bank at a plant will be cheaper and cover
more possibilities than trying to connect capacitor banks at all motors.
 
> I doubt it is cost effective to put correction at motors in a house.
 
Yup. The largest motor I can think of in a house might be the compressor
in a split airconditioning system. Those always have dedicated runs of
power so they're more like an industrial schenario where wiring is run as
needed, dedicated and properly sized to the intended load in the first
place.
Cydrome Leader <presence@MUNGEpanix.com>: Jul 03 07:34AM


> Like those things that give you even years of electricity (for an
> average house, not a foundry) for a million bucks. It simply is not
> worth it.
 
We had a mini-mill in the north side of Chicago until recently. They'd do
the melts at night for 1) better electric prices and 2) it was the only
time of day their capacity needs could be met, even in an otherwise
industrial area. I never saw the electric meters, but the powerlines
feeding the complex had lots of instrument transfomers installed, way more
than you'd usually see. Even after the building were completely
demolished there was a mountain of power factor capacitor piled up in the
gated off, otherwise vacant lot.
 
> possible way to cheat and addressed it. What would you do ?
 
> There are a few things they did not think of but I am not going into
> that.
 
Let's hear. I want to know all about how to steal $2 of electricity per
month with complex devices.
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