[RE-wrenches] Ac Coupling

[Kirpal]

 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
541-299-0402

On Thu, Jul 19, 2018 at 7:07 AM, Larry Brown <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
>
>
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