It looks like way too much power to AC couple
with a 4KW Radian. Be sure to talk to an Outback
engineer in great detail before using the GSLC175AC-120/240.


At 10:54 PM 10/17/2016, you wrote:
Esteemed Wrenches:

Anyone have experience setting up AC coupling
with SolarEdge and the Outback Radian?

I have a client with a SolarEdge SE10000A-US
inverter, equipped with 31 SunPower X21-345
modules (10.7kWp) and associated SolarEdge P400
DC optimizers. The DC optimizers are arranged
into two strings of series connected optimizers: #1 = 16;Â  #2 = 15.

The client wants to add a limited battery backup
solution, and a 4kW inverter will serve the
needs of the requisite protected loads panel.

I am considering using the Outback Radian
GS4048A inverter in conjunction with the GSLC175-AC-120/240 AC-Coupling Center.

I want to make a slight change to the PRI
programming on the SolarEdge inverter, and add
another relay contact to the Radian, to
accommodate a 4kW Outback inverter AC coupled to a 10kW SolarEdge inverter.

This is my first AC coupling project with these
systems. The analysis below is based solely on
review of available documents on the Outback and SolarEdge web sites.

Any help or guidance will be greatly appreciated.

Regards,

Gary Willett
Icarus Engineering / Solar Services LLC

References:
(1) Outback Application Note "AC Coupling
OutBack Power Radian Inverters with SolarEdge N. American Inverters"
<http://www.outbackpower.com/downloads/documents/technotes/ac_coupling_tech_note.pdf>http://www.outbackpower.com/downloads/documents/technotes/ac_coupling_tech_note.pdf

(2) Outback Application Note "Adding the battery
back-up power option to existing grid-tied PV/solar systems"
<http://www.outbackpower.com/downloads/documents/flexcoupled/app_note_acc_new.pdf>http://www.outbackpower.com/downloads/documents/flexcoupled/app_note_acc_new.pdf

(3) SolarEdge Application Note "SolarEdge Inverters, Power Control Options"
<http://www.solaredge.com/sites/default/files/application_note_power_control_configuration.pdf>http://www.solaredge.com/sites/default/files/application_note_power_control_configuration.pdf

REF (2); Page 9 of 14 - Outback's AC Coupling Guideline Number Two:
The OutBack inverter power rating should be
1.25% of the GT inverter power rating. This
guideline ensures that the GT inverter does not
overwhelm the charging circuitry in the OutBack
inverter if the load demand goes to zero and all
available GT inverter power is flowing to the OutBack inverter.

With the 4kW GS4048A inverter, the PV power
rating is therefore limited to 3.2kW. This is
30% of the nameplate rating of the PV array (3.2/10.7).

REF (3); Page 4 of 5 - SolarEdge/OutBack Radian Wiring Diagram:
On the male connector that fits into the PRI
connector on the SolarEdge PCB, two wires are
connected from the OutBack GSLC load center 12V relay (OBR-16-DIN).

When activated, a normally open contact (NO) of
the Outback OBR-16-DIN 12V relay supplies +5V
from "pin 8" to "pin 6" of the SolarEdge
inverter's "Power Reduction Interface (PRI) port".

REF (1); Page 3 of 5 - SolarEdge Setup / Programming:
Per the App Note, when the Radian wants to shut
down the SolarEdge, the OBR-16-DIN 12V relay is
activated and a "1" is applied to bit 1 of the
PRI. This takes the SolarEdge output power, in a
gradual manner, from 100% to 0%.

"DEFAULT" SolarEdge Programming
0000 <100,1,00,Y> ----meaning = 100% power, 1.00 power factor, point is active
0001 <0,1.00,Y> ----meaning = 0% power, 1.00 power factor, point is active

For my project, when the grid is down, the
SolarEdge inverter must be limited to 30% power.
I want to use the second NO/NC contact on the
OBR-16-DIN 12V relay to accomplish this. Not yet
sure exactly how to accomplish this in the
Radian programming, but here's how I want it to function:
(a) when the grid is down, the second OBR
contact, connected to bit 2 of the PRI, is
activated and a "1" is applied to bit 2. This
takes the SolarEdge output power, in a gradual manner, from 100% to 30%.

(b) when the Radian wants to shut down the
SolarEdge, a "1" is applied to bit 1. This takes
the SolarEdge output power, in a gradual manner, from 30% to 0%.

"PROPOSED" SolarEdge Programming
0000 <100,1,00,Y> ----meaning = 100% power, 1.00 power factor, point is active
0001 <0,1.00,Y> ----meaning = 0% power, 1.00 power factor, point is active
0010 <30,1.00,Y> ----meaning = 30% power, 1.00 power factor, point is active
0011 <0,1.00,Y> ----meaning = 0% power, 1.00 power factor, point is active

Is this doable?


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