Friends:
Better advice: If you can down size a breaker in the main panel feeding
the garage sub-panel to about 70 amps, you gain 30 amps of back feed
capability. Far easier and cheaper.
William
At 01:04 PM 9/2/2009, you wrote:
Carl:
To analyze these scenarios, you need to know the Maximum AC Output Current
possible with a given inverter. I do not have the time to look these up,
I leave that to you.
Assuming the breaker sizes are close to the maximum AC output amps, you
are above the capabilities for load side connection in both the garage
sub-panel and the meter/main. The garage sub-panel can have a maximum of
20 amps back feed and the meter/main can allow 40 amps back feed.
There are many ways to accomplish point of connection, but one approach
would be to provide a supply-side tap at the meter and/or main and upgrade
the garage sub and garage feeder to a size that would allow the 20% rule
to accommodate all RE feeds.
In other words, the meter/main would be considered under the supply-side
section of the code and the garage under load-side section. All links of
this chain must comply with one or the other.
If you need more clarification., contact me off-line.
William Miller
At 12:11 PM 9/2/2009, you wrote:
Hello Wrenches,
I have a prospect who has an existing PV system and a small wind
turbine already in place. He is interested in adding additional
capacity via another small grid tie system. The attached drawing
outlines the existing and proposed installation. My question has to
do with the grid tie in. Given the existing connections for the 2
existing DGT inverters can I connect as proposed in the drawing or
would I need to perform a line side tap on the primary feed.
Alternative suggestions appreciated.
Carl Adams
SunRock Solar, LLC
Content-Type: application/pdf; name="DGT Upgrade Single Line Drawing.pdf"
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filename="DGT Upgrade Single Line Drawing.pdf"
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