DC-GFP/2 protection [RE-wrenches]

[Jeff Yago]

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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