[RE-wrenches] Braided grounding wire

Peter Parrish peter.parrish at calsolareng.com
Fri Aug 22 08:51:54 PDT 2008


You might give the guys at NorthWest Data Comm, Reno, NV a call.

 

Peter T. Parrish, 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of
holtek at sbcglobal.net
Sent: Friday, August 22, 2008 8:41 AM
To: RE-wrenches
Subject: [RE-wrenches] Braided grounding wire

 

Anybody know a source for braided grounding wire? Internet search
fruitless......

 

Holt E. Kelly
Holtek Fireplace & Solar Products
500 Jewell Dr.
Waco,Tx. 76712
254-751-9111
254-228-9621 (cell)
holtek at sbcglobal.net

----- Original Message ----- 

From: Kurt Albershardt <mailto:info at es-ee.com>  

To: RE-wrenches <mailto:re-wrenches at lists.re-wrenches.org>  

Sent: Friday, August 22, 2008 12:57 AM

Subject: Re: [RE-wrenches] motor starting issues (was: offgrid
systemquestion)

 

--On Tuesday, August 19, 2008 7:57 AM -0700 Peter Parrish
<peter.parrish at calsolareng.com> wrote:
>
> Any motor will need both a voltage and current to operate properly, and
they tend to draw more and more current as the source (inverter) voltage
drops.


Back to basic physics:

Depending on design, electric motors can be constant power or constant
torque (or some combination of two) devices.

Three phase AC motors are generally simpler in design and better behaved
than either either single phase AC motors or DC motors.  Permanent magnet
synchronous 3Ø AC motors (available now) closely approach the theoretical
limits of electromechanical motor systems in general.

Modern power electronics and control systems give us essentially perfect
control of voltage, current, and frequency in AC systems.

Intelligently combining the above allows us to design efficient
electromechanical systems which match nearly any complex supply impedance.
These systems also happen to live longer, fail less often, and reduce both
battery bank and inverter requirements.

The market (arguably free on so many levels, and obviously not on so many
others) can address this using current technology.   System sizing math not
has changed fundamentally in several decades but we are getting closer to
those fundamental limits.

Industrial systems are a bit ahead of the consumer market in some areas but
behind in others.  As one very basic example, Turbocor's maglev compressor
has created a few waves in the commercial and light industrial sector but I
fully expect some fascinating trickle-down benefits over next few years
<http://www.turbocor.com/products_technology/>







.


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