nuckollsr(at)cox.net
Guest
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 Posted: Tue Mar 13, 2007 5:37 pm Post subject: Comments please on this solid state contactor....... |
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At 07:35 PM 3/13/2007 -0500, you wrote:
| Quote: | I have been testing my electrical system on my all- electric Velocity- with
no load, only the coils energized for about 30 minutes my battery contactors
were both quite hot- too hot to hold for more than say 5 seconds- comments
from other builders agree that this is rather normal- someone suggested the
"Czonka III" solid state unit- uses no appreciable power- good for tens of
thousands of cycles at 200 amps- please see attached PDF- is there any
foreseen drawback other than cost?
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None . . . but keep in mind that the "too hot to touch" contactors
have been used for about 70 years with good return on investment.
The "solid state" units have circuitry that drops coil current from
an initial, full power pull-in current to some nominal holding
current after a second or so. Problem with some devices is that
the duty-cycle power controller generates noise in some systems.
Further, it's unknown whether the circuitry as-supplied would
live happily in known (DO-160) world of stresses. I'm not suggesting
that it won't . . . just don't know.
The continuous duty contactor dissipates about 10 watts. Sufficient
power to raise the surface temperature to about 170F in a room
temperature environment. See:
http://www.aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_1.jpg
http://www.aeroelectric.com/Pictures/Contactors/Battery_Contactor_Temps_2.jpg
This 'seems' hot but all of the materials used to fabricate
the contactor are rated at 150C or better. It's no big deal
in the grand scheme of things and it's hard to beat the price.
Bob . . .
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( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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