[RE-wrenches] AC coupling SolarEdge

[jay peltz]

Hi Mac,

It looks like they are doing all that work on the AC side.
If you do the DC side, you'll lose the comm from the optimizers causing error messages etc.

For the few times a year this will actually need to regulate, depending on the battery inverter  I'd install a AC relay and kill the whole array.
Simple, easy reliable.
And in the end you'd need to do this anyway even if you did some string  disco's as you mention is a modest ( small) battery which means its easy to over cook it, and I"m guessing its VRLA.

jay
peltz power


On Dec 10, 2014, at 6:12 AM, Mac Lewis wrote:

> Hello wrenches,
> 
> 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?
> 
> I could easily get away with a ~4 kW battery-based inverter and would like to avoid stacking unnecessarily.  
> 
> Solar Edge also offers power output control through radio ripple control.  I took a look at this paper on it http://www.solaredge.com/files/pdfs/power-reduction-control-application-note.pdf.  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?
> 
> Thanks
> 
> -- 
> 
> 
> 
> Mac Lewis
> 
> "Yo solo sé que no sé nada." -Sócrates
> 
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