DC-GFP/2 protection [RE-wrenches]

[Allan Sindelar]

AC and DC grounds should be bonded, whether they are carried to a single rod
with two ground clamps or run to multiple rods bonded together. If the AC is
grounded but the DC is not, there is a potential voltage difference between
the two sides. A ground surge is picked up by supply and distribution
wiring, especially when directly buried. The inverter(s) are the point where
the voltage difference ends up, and the electronics within release the
compressed smoke from which all electronic components are manufactured.

At least that's the way we do it...

Allan at Positive Energy

----- Original Message -----
From: "Jeff Yago" <jryago at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, August 22, 2002 7:11 PM
Subject: RE: DC-GFP/2 protection [RE-wrenches]


> We just returned from inspecting a brand new 4 month old system (that we
did
> not install!!) that had BOTH SW5548 Trace inverters "fried" by lightning.
> This was a 4800 watt totally off grid system.  The AC side of the
inverters
> supply a standard 120/240 volt house panel that was grounded properly.
The
> ground mounted array frame was grounded properly also.  However, the
> negative of the DC side of the inverter, batteries, and charge controllers
> were not grounded.
>
> The lightning was "nearby" but was not a direct strike.  Since there was
no
> grid connection, the surge could not have entered the AC side.  I for one
> like grounding the DC side and wish this installer had done so also.
>
> Jeff Yago
>
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