<div dir="ltr">I'll tell you exactly how to do this, if I understand the SolarEdge documentation. I am working on a similar project, but using a contactor to disconnect three 10KW String inverters.<div>Forget the Radio Ripple. The SolarEdge has a simple four line control system. SMA has the same thing on it's Power Control Module that plugs into TL inverters.</div><div>You can use a Raspberry Pi or Arduino microcontroller to switch those four lines to get the inverter output control you want. Both controllers have accessory relay boards, but I suspect the General Purpose Input Outputs would also suffice.</div><div><br></div><div>So once you are switching those control lines, you have control of the inverters.</div><div><br></div><div>Now, what is the criteria you are using? </div><div>In pseudo code, it would be</div><div><br></div><div>If Grid_Power is present</div><div><div> //Switch Inverters to 100%</div><div> Set GPIO1 = 0</div><div> Set GPIO2 = 0</div><div> Set GPIO3 = 0</div><div> Set GPIO4 = 1</div></div><div>else<br></div><div><div> //Switch Inverters to 30%</div><div> Set GPIO1 = 0</div><div> Set GPIO2 = 1</div><div> Set GPIO3 = 0</div><div> Set GPIO4 = 0</div></div><div><br></div><div><br></div><div>then the question is, how do you sense grid power?</div><div>You can also turn on and off an Outback Radian 4048A inverter using the microcontroller as the Radian has a contact for this purpose. </div><div>Pretty easy project</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Dec 10, 2014 at 10:12 AM, Mac Lewis <span dir="ltr"><<a href="mailto:maclewis1@gmail.com" target="_blank">maclewis1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello wrenches,<div><br></div><div>I have a request to design a modest battery backup system for a residence that has a 10 kW grid-tied Solar Edge system using a single SolarEdge Inverter SE10000A- US. I'd like to try to utilize the solar potential that we have on site. One idea that I had was to use DC relay(s) to cut out a couple strings when the grid was out, dropping the PV input down to about 3kW. Has anyone ever tried this?</div><div><br></div><div>I could easily get away with a ~4 kW battery-based inverter and would like to avoid stacking unnecessarily. </div><div><br></div><div>Solar Edge also offers power output control through radio ripple control. I took a look at this paper on it <a href="http://www.solaredge.com/files/pdfs/power-reduction-control-application-note.pdf" target="_blank">http://www.solaredge.com/files/pdfs/power-reduction-control-application-note.pdf</a>. Off-the shelf it looks like I would need a computer to control the power output dynamically. Perhaps I could activate the 5V K2 relay with a simple control scheme and drop the power to 30%, but I hesitate to dive in too deep. Anyone worked with radio ripple control?</div><div><br></div><div>Thanks<span class="HOEnZb"><font color="#888888"><br clear="all"><div><br></div>-- <br><div><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:'Times New Roman';font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136)"><span style="font-size:13px">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136)"><span style="color:rgb(34,34,34)">Solar Design Engineer</span></div><div style="color:rgb(136,136,136)"><span style="font-size:13px">Generac Generators Industrial technician</span></div></div><div style="color:rgb(136,136,136)"><span style="font-size:13px"><br></span></div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometsolar.com</a></div><div>264.235.5670</div><div>869.662.5670</div><div>Skype: netconcepts</div></div></div>
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