Dave, I'm pretty sure I have not done that test. I'm not currently in sure and won't be for a couple of weeks, but maybe I can try it remotely. Went would disabling the charger make a difference with an AC coupled backfeed issue? Thanks, Howie
On Mon, Jul 24, 2023, 10:45 AM Dave Angelini Offgrid Solar via RE-wrenches < [email protected]> wrote: > 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/ <http://members.sti.net/offgridsolar/> > e-mail [email protected] <[email protected]> > 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 < > [email protected]> 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 <[email protected]> > To: Dave Angelini <[email protected]>, RE-wrenches > <[email protected]> > Subject: Re: [RE-wrenches] Inverter output fluctuations > Message-ID: > <CAHMeMs= > [email protected]> > 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 > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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