blown FETs and no gas [RE-wrenches]

[Tom Elliot]

Yep, the quality of the waveform would definitely depend on which and how
many FETs were damaged.  I agree that Trace takes care of teh damaged FETs
they know about.  But if there is no way to know, absent some other problem,
if there even is any damage it kinda makes it difficult to know whether to
request a repair or not.

I just wish there were a way to notify users of a problem with the FETs or
that such a problem were even considered a valid error condition.

Run this by Sam and see what he has to say.  And again, if there is some
clear definitive explanation why I should be having this problem or why it
isn't trapped for in error conditions I'm all ears.

I just wonder if using 400 volt FETs might just solve the problem.

Tom Elliot
Guffey Energy Works
Solar Energy Education
http://www.wagonmaker.com


----- Original Message -----
From: "R. Sparks Scott" <sharkey at mrsharkey.com>
To: <RE-wrenches at topica.com>
Sent: Friday, July 07, 2000 4:38 PM
Subject: Re: blown FETs and no gas [RE-wrenches]



Wrenches;

Hello from the Oregon Country Fair, home of Energy park! Sorry for any
typing or syntax errors, I'm typing fast as I have to make two T-105's in
my RV last for a week with no PV input to speak of...The Trace 812 on board
draws 6.8 amps running the PC and LED monitor, not a lot, but conservation
in the rule.

My 2¢ on the FET discussion:

My SW2512 blew some FETs a couple of years ago operating strictly from
grid power. It would still invert just fine, the loads didn't complain, but
it wouldn't put any charge back into the batteries or feed the grid. Don't
know what the wave form looked like, but I'll bet it was trash. My guess is
that it would depend of which FETs went out, as there are three
transformers in a SW and bad FETs on the small or medium transformer feed
would result in less noticable problems.
To their credit, Trace repaired the inverter, instaiing a new FET board,
new input filtering, load transfer relay panel, and latest version of
software, and had it back in two days!
I'm off the the Trace booth to say hi to Sam Vanderhoof and crew, Bob-o
and Bob-1 say Hi!

Later.

-S

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Hosted by Home Power magazine: <http://www.homepower.com>

for info contact: <michael.welch at homepower.com>
___________________________________________________________
T O P I C A  The Email You Want. http://www.topica.com/t/16
Newsletters, Tips and Discussions on Your Favorite Topics