[RE-wrenches] Exeltech

[David Palumbo, Independent Power & Light]

Richard,
Thanks for your help (and to everyone else who has advised us on this
issue).

We already have twisted the battery cables but were only able to get three
turns on them because of their length. Would you recommend trying longer
cables of #4 with more turns?

Also, what exactly is a "choke"? Where do I purchase it and do I ask for a
specific size? I am electronically not the most experienced wrench. I have
heard of chokes before in terms of filtering but have no experience using
them myself. I do not see choke listed in the index of Basic Electricity and
Electronics, S. Matt. Are they known by another name?

It was good seeing Ian at SolarFest this past weekend.

Warmest regards,

David

-----Original Message-----
From: Richard Perez, Home Power magazine
[mailto:richard.perez at homepower.com]
Sent: Wednesday, July 17, 2002 2:03 PM
To: RE-wrenches at topica.com
Subject: Re: [RE-wrenches] Exeltech


Hello Wrenches

We've used a variety of Exeltech inverters here for over eight years
now--SI series, XP series and the big MX series. In terms of RFI, the
Exeltechs are good as any and better than some....

We extensively use all types and frequencies of radio here-- VHF
radiotelephone, HF and VHF ham radio, FM stereo, broadcast TV, cell
phone, and AM broadcast radio. We currently have two Exeltechs
running 24/7, a 12 VDC XP1100 and a 24 VDC MX. We experience no
detectable RFI from these inverters.

Whomever mentioned that filtration in the particular radio device is
the key factor is entirely right. John's mention of a filter on the
DC cables feeding the inverter is right on--most RFI made by pure
sine wave inverters originates on the DC input cables. Use a choke or
make a twisted pair of the cables feeding the inverter. And of
course, physical separation helps--located all antennas and radio
gear as far from the inverter as possible.

Hope this helps.

Richard Perez N7BCR

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