Do you hear audible changes in generator rpm? I believe that generator has the RDC2 controller that you can log into with Sitetech. There is a parameter that adjusts the sensitivity of the governor (I can dig up the exact parameter later). A Kohler tech can adjust this and I'm betting it will help, or at least rule out the generator control loop.
What's your altitude? On Thu, Mar 19, 2020, 1:20 AM William Miller <[email protected]> wrote: > Mac: > > > > I know well what the AC input mode is. This is the project that had the > excessive THD on the voltage waveform (>26%f). Here is a link > <https://millersolar.com/MillerSolar/case_studies/25_GFI%20Tripping/GFI_Tripping.html> > to the case study. > > > > As you can see, we resolved the problem by changing the AC input mode to > Backup. After recent rains started and generator run became necessary, the > client started noticing flickering of lights and refrigerator operation was > unreliable. We examined the E-Gauge data and could see rapid fluctuations > in the generator output. At one point we saw generator power range from > 19kW to 12Kw and back in about 2 seconds. > > > > We isolated the generator into a load bank and it was rock solid. We > tried lots of things but when we reconnected the generator to the Radians > and switched to the Radians to Generator input mode the surging stopped. > Unfortunately, the Generator mode causes tons of THD, as noted in the case > study. > > > > So we can’t use Generator because of THD, and we can’t use Backup (or > Support or UPS) because in all these modes the generator surges. > > > > By the way, this is a newish Kohler 30RCL. This should be a rock-solid > match to a 24 kW Radian system. > > > > Like I said, we tried lots of things. What stopped the surging was to > open the AC input breaker to Inverter 1. It did not help to open the input > to Inverters 2 or 3. I don’t have a clue as to why this is so… > > > > We tried taking Inverter 1 out of the system--moving inverter 2 up to > Master and Inverter 3 to Slave 1. The generator still surged. So if anyone > started to think Inverter 1 was the problem, this was not confirmed. > > > > We are certain the neutral bonding is exactly as it should be. We tripled > checked this when chasing the THD problems. We also adjusted input AC from > 30 to 50 (per port), no improvement. > > > > I must say Outback has been very available to us as we try to figure these > problems out. I am fortunate that I am working with a senior engineer. We > are both currently stumped, but we are going to consult again tomorrow and > see if any other ideas come to us. > > > > Thanks everyone for the input. More soon. > > > > William Miller > > > > > > *From:* RE-wrenches [mailto:[email protected]] *On > Behalf Of *Mac Lewis > *Sent:* Wednesday, March 18, 2020 6:35 PM > *To:* RE-wrenches > *Subject:* Re: [RE-wrenches] Generator surging > > > > Hi William, > > > > Do you know what your AC input mode is? > > I'd try playing with this mode. > > If you have a generator, I'd try switching between "generator", > "support". You may quickly see a difference. There is a small diode > symbol that shows up on the Mate3s screen during generator charging. I > don't fully understand what that means but I know that it can affect how a > generator works with the Radian. > > > > Also, you may try lowering the charging current and see how the generator > responds. > > > > What type of generator? Whats your AC input limits? > > > > On Wed, Mar 18, 2020 at 6:56 PM Jerry Shafer <[email protected]> > wrote: > > Adjust the generator max output in the outback down and see what happens > > Jerry > > > > On Wed, Mar 18, 2020, 4:04 PM William Miller <[email protected]> > wrote: > > Friends: > > > > I have a 24kW Radian system that is acting up. The problem is when the > generator is running, it surges. Voltage and power go up and down. We > connected the generator to a load bank and there was no surging. This > makes me think the problem is in the Radian system. > > > > Has anyone else experienced this? > > > > Thanks in advance for any input. > > > > William Miller > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > > > -- > > > > > > > > Mac Lewis > > "Yo solo sé que no sé nada." *-Sócrates* > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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