I've AC coupled off grid with the Sunny Island, but I haven't tried it
with Solar Edge. Can you adjust the Solar Edge coupling window to
outside the IEEE set points? We used to have set all GT inverters in
Hawaii wider, because the utility wanted them to stay on longer in a
brown out.
Ray Walters
Remote Solar
303 505-8760
On 7/25/19 5:55 AM, Howie Michaelson wrote:
Hi Ray,
I get the issues with AC coupling. However, this system already has a
3+ kW DC coupled array, the new array is close to 200' away, and it
would take 2 more charge controllers of any of high voltage ones for
this size array.
Are there any battery based inverters that folks have had decent luck
with AC coupling in an off-grid environment? (My preference would be
the XW+).
Thanks,
Howie
On Thu, Jul 25, 2019 at 1:43 AM Ray <r...@solarray.com
<mailto:r...@solarray.com>> wrote:
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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