Hey Howie, Can't remember but did you try disabling the charger in XW+
for a pulsation test ?
Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail offgridso...@sti.net
text 209 813 0060
On 2023-07-23 9:37 pm, Howie Michaelson via RE-wrenches wrote:
Don,
Thanks, but this is not the issue here. The fluctuations happen
anytime the AC coupled inverter connects to the XW+'s "grid", not just
when the batteries are full. The frequency only changes about 1/10 of
a herz when it connects, but it doesn't matter what the voltage is of
the batteries, the pulsation starts. Going over the settings with Eric
Bentsen, we shut off the AC coupled option to prevent the frequency
shifting - this made no difference. We do have a contactor installed
that disconnects the inverter from AC when the voltage starts elevating
past the charge voltage and it has worked well for years. If I set up
an AC coupled Off-Grid open loop system in the future, I'm thinking
that I would look to disconnect the DC input as the batteries reach
charged voltage - generally an easier cycling for the system to endure.
There is also a smaller, legacy DC coupled array in this system which
takes care of the finishing charge of the batteries through a charge
controller. Again, it has all worked well in the past, only having any
issues with AC fluctuations due to having the generator charging load
set too high for the existing generator. This was solved by simply
turning down the charge rate of the batteries and the visible light
fluctuations stopped.
Howie
On Sun, Jul 23, 2023 at 11:42 PM don energysolarnow.com [1]
<d...@energysolarnow.com> wrote:
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.michael...@gmail.com>
To: Dave Angelini <offgridso...@sti.net>, RE-wrenches
<re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Inverter output fluctuations
Message-ID:
<CAHMeMs=ooj_p0_a_sjyvw7_-+8kc9yvfsnm9pkwvgk-xnjx...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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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