[RE-wrenches] SolarEdge AC coupled off-grid (part 2)

[Ray]

I do not recommend AC coupling for off grid, except to offset daytime 
loads or to add PV at remote buildings.  Besides coupling errors like 
you're experiencing, the entire system will shut down and not recharge, 
if the VFX inverters shut down.   With a DC coupled array, the batteries 
can recharge, even if the inverters have shut down for low voltage, over 
load, etc.  At least when someone comes to reset it, the battery won't 
be dead too.  The 3rd reason, as you've found, SE and other GT manus, 
don't want to deal with off grid.

There are higher voltage, higher capacity Charge controllers available 
now, like the FM100, and Magnum PT 100 that could almost handle that 
array with one controller.  The PT 100 will work with Midnite's SOB 
rapid disconnect system.


Ray Walters
Remote Solar
303 505-8760

On 7/24/19 11:03 PM, Howie Michaelson wrote:
> sorry, prematurely emailed previous post:
>
> I'm wondering if the VFXs are just not capable of putting out clean 
> enough power in order to hold the SE HD inverter. I had it operating 
> on this same system for a couple of hours with not this problem.  Is 
> it likely that this inverter combo is not going to work consistently?  
> Will it make sense to use a different battery inverter (XW+6848 or 
> Radian)? What has folks experience been in similar off-grid AC coupled 
> SE systems?
> As always, thanks in advance for any thoughts.
>
> Best,
> Howie
>
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