[RE-wrenches] Ac Coupling

[Larry Brown]

Kirpal

Thanks for the recommendations
If you have a diagram that would be most helpful and generous
What Lithium Battery are you using with this configuration?

Much Appreciated
Larry

Larry Brown
Sun Mountain
845-657-8096
Sunmountain at netstep.net


On Jul 19, 2018, at 11:15 AM, Kirpal <solarworks at gmail.com> wrote:

Larry.....Outback Radian would work fine but you would need 2 of the 8kW inverters for your ~11kW GT inverter.  Outback  recommends a maximum 75% loading ratio when AC coupling.  We have used a simple solid state relay controlled by the Aux Out of the Radian to turn off one leg of the SolarEdge or any other GT inverter essentially shutting off the GT inverter when a desired battery voltage is reached.  
As an aside, in earlier days when lead acid batteries where the main battery technology I didn't like this set up because it didn't allow multistage charging of the batteries leading to batteries only reaching approximately 80% SOC (bad for batteries) because there was no ability to taper charge (aside from frequency shift compatible inverters). But nowadays with Lithium batteries, which don't require multistage charging becoming more common this method of AC coupling is pretty attractive because the batteries don't care if they only reach a partial state of charge....Even though you can charge them more than 80% before kicking off the GT inverter.  We have used this method successfully in addition to having DC coupling present in the same system as well.
Let me know if you need a diagram.


Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
NABCEP Certified PV Installation Professional
Oregon Solarworks LLC
www.oregonsolarworks.com <http://www.oregonsolarworks.com/>
541-299-0402

On Thu, Jul 19, 2018 at 7:07 AM, Larry Brown <sunmountain at netstep.net <mailto:sunmountain at netstep.net>> wrote:
Does anyone have a recommendation on a battery based inverter to AC Couple with a Solar Edge 11400A-US Inverter that is already installed?
I have been working a lot with the Schneider Conergy XW+ Inverters for off grid but have no experience AC Coupling them with a Solar Edge Inverter
Any recommendations?

Thanks
Larry

Larry Brown
Sun Mountain
845-657-8096
Sunmountain at netstep.net <mailto:Sunmountain at netstep.net>


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