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Inverter quandary

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Posted by mainehermit on September 29, 2007, 4:03 am
 
I found a nice Vector Maxx SST 3000w inverter that I want to use in my
cabin's pv system.
In reviewing the instructions I found the following :

" Do not connect to AC distribution wiring "

Ouch ! I had intended on connecting it to my fusebox .

It further said:

"Using power strips, with switches and circuit breakers, only
interrupt
power to the "hot" receptacle terminals. The "neutral" terminals
remain
powered with respect to the "ground" terminals."

What could the reason be that I shouldn't connect the inverter to my
circuit box ?  ?

Can I use a regular grounding rod ?


Posted by bealiba on September 29, 2007, 5:41 am
 
On Sep 29, 2:03 pm, maineher...@gmail.com wrote:

Read as; Do not connect to grid.

I think this means that most switches only switch one leg of a
circuit. Could be wrong.

See above.


Posted by Blue Cat on September 29, 2007, 2:38 pm
 

This inverter does not have the circuitry to synchronize its 120 vac output
with the grid. If you connect to the grid without proper sync, your
equipment will be fried along with your cabin. To be safe, use a separate
wiring system.



Posted by mainehermit on September 29, 2007, 3:37 pm
 Vector Maxx SST 3000w inverter that I want to use in my

The "grid " is a 1/4 mile away.
So do you think it will work in my cabin with a standard "square D "
box ?


Posted by Bruce in Alaska on September 29, 2007, 5:34 pm
  mainehermit@gmail.com wrote:


NOT THE ISSUE HERE AT ALL.....  Nice try though.....


The real problem here is that in your Inverter the Neutral and Ground
on the AC Output are not at the same, or similar potential.  Typical
of the less expensive inverters.  What they are warning you of is
that the  AC side of the Inverter is driven from a CenterTapped Output
where both Hot and Neutral are both referenced to +/- 60Vac around
Ground. This means that if you tie this inverter to House Distribution
System where Neutal and Ground are bonded in the Entrance Panel,
your Inverter will be shorted on it's Neutral to Ground, about 1/2
the 120Vac output of the Inverter, and the MAgic Smoke is sure to
Leak Out very fast. Also, if you just switch the Hot Leg, the Neutral
Leg will still be powered when referenced to Ground, because MANY
PowerStrips, and other loads only switch the HOt Leg and not Both
Hot and Neutral as this Inverter requires.

Better get you money back, and go spend a few more
Dollars/Pounds'Sheckles and get a REAL Inverter that doesn't
Split the AC Output around Ground.

Bruce in alaska
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