How many kWh are you shooting for?

 
> On Oct 17, 2016, at 9:54 PM, Gary Willett <g...@icarussolarservices.com> 
> 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;  #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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