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Nik,<br>
<br>
120/208 has a 120 degree phase angle between legs, same as three-phase
but you only have two legs. Check with Outback tech support, but I
believe the GTFX inverter can only be stacked in systems with 120/240
split phase (180 degrees between legs). <br>
<br>
If there are no 208 loads, just unplug the second inverter from the Hub
and program both inverters to be a Master so you have two independent
120-volt systems. With two independent 120-volt systems you should
have a separate neutral conductor for each inverter, on the load side
because the two inverters aren't synchronized when there is no utility
power. On the source side they can share a neutral, but it has to be
the same size as the hot legs, because line power keeps them in sync.<br>
<br>
If you have 208 loads on the backup power panel; well -- you can't do
it unless Outback has support for three-phase grid connected systems.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar, Inc.<br>
<br>
<br>
Nik Ponzio wrote:
<blockquote cite="mid:48ef16d4$25abfa79$40f06a11$@com" type="cite"><span
style="font-family: Arial,Helvetica,sans-serif; font-size: 10pt;">Hi
Gang,<br>
<br>
I have a problem. We are installing a gridtie PV system with 2
battery-based inverters for 240V. The service coming in to the condo is
120/208 split-phase fed from 3-phase 208 in main building. The master
inverter pickups up L1 but the slave inverter will not sync. What am I
missing?<br>
<br>
Thanks and Happy New Year to all!<br>
<br>
</span>
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