[RE-wrenches] Inverter output fluctuations

[don energysolarnow.com]

Howie-
 it sounds like the XW+ is trying to curtail the Solar Edge by shifting frequency, and the loads don't like it.
When off-grid and batteries are charged there is no place for all that AC coupled solar power to go.
This is an issue windmill folks have too. The solution can be as simple as a dump load such as a water heater to absorb the excess energy.
Tell the customer to turn the hot tub up high, or something like that. Heat up a bathtub in a greenhouse and plant bananas.

DonBarch
Energy Solar

From: Howie Michaelson <Howie.Michaelson at gmail.com>
To: Dave Angelini <offgridsolar at sti.net>, RE-wrenches
        <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Inverter output fluctuations
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Hi,
I was finally able to get to the site with the light pulsating issue. It
turns out it is that it directly corresponds to the AC coupled SolarEdge
HDwave 6kW inverter.  Moreover, the pulsating gets stronger with higher
output of the SolarEdge inverter (as more sun pouches more current through
the inverter). And the hum of the XW+ very noticeably fluctuates in direct
proportion to light fluxuations. It affects all the lights in the house,
regardless of manufacturer, wattage or age. I did not have an oscilloscope,
but looking at the Hz, it does sag very slightly to 59.9 when the SolarEdge
is producing, down from a rock solid 60 Hz when the SE is not producing.
The output voltage does not change at all.  The fluctuations in both the
lights and the inverter hum immediately stops when the SolarEdge production
is shut off. So it is clearly some interaction between the 2 inverters
causing this issue.

Has anyone dealt with this issue before? Does anyone have any suggestions
for dealing with this, short of replacing the SolarEdge with a Schneider
high voltage Charge Controller?
Thanks,
Howie

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