lightning arrestors in high voltage arrays [RE-wrenches]

[Kirk Herander]

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Group,
Is the Delta 302 DC arrestor suitable for high voltage PV arrays? At what
voltage does it "turn-on"? Any other suggestions for lightning protection in
Sunnyboy systems?

thanks, Kirk

Vermont Solar Engineering
Kirk Herander
North American Board of Certified Energy Practitioners
Certified Solar PV Installer(TM)
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
Vermont Solar and Wind Partner

PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
www.backeastsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

----- Original Message -----
From: "Kurt Nelson" <sunwise at cheqnet.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, December 09, 2004 7:11 PM
Subject: Filtering EMF/RF noise [RE-wrenches]




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Greetings all,

I have recently installed a few off-grid PV systems wherein the home is
heated with in-floor radiant heat.  With the use of high efficiency DC
pumps the total electric load of the heating system can be as little as
20 watts when running and zero when the thermostat is satisfied.

The problem is with the annoying static in FM radio reception when the
pumps are operating.  Brushed motors run the March 809 zone pumps and
the smallest, brushless El Sid pump circulates water through the heat
exchanger on the hot water heater.  I thought it would have been the
brushes, but it turns out it is the El Sid brushless motor making most
of the noise.

The filter I tried did nothing and was essentially a choke (10 ohm wire
wound resistor) and a diode (6A rectifier) in the positive line just
before a 4,700 mF, 35 volt electrolytic capacitor across the conductors
at the pump.

BTW, a portable, battery operated radio picks up the noise so the
interference is not on the power supply lines to the home's radios.

Any thoughts greatly appreciated -- Kurt Nelson

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