Jay I too find this firmware issue questionable. there IS settings on this AGS & Inverter for disconnect using voltage AND or hz. Again voltage 110/55Hz is what I will usually start out with.These additional settings; cool down time and spin down time, I set to the lowest setting possible. This being said….. I would not be a bit surprised that some bonehead code writer had NO idea what Hz was when and IF he set this to 40 Hz. Happy new year to all! TUMP > On Dec 31, 2016, at 12:39 PM, jay <jay.pe...@gmail.com> wrote: > > HI Hugh, > > Interesting problem your describe which I've not seen before. > > I’m curious about your comments on Outback. > I’ve found them to be quite programable in regards to disconnecting from a > generator. > You can set voltage and cycles. Default comes in at 60 cycles which is 1 > second and way too long. > Setting it down to around 10 cycles works with every generator I’ve tried, > and from my measurements the inverter seems to be switching on cycles, not > voltage. > But maybe I misunderstood what you were saying? > > But I know in the old days before inverters got so programable ( or poorly > programed in the case of the new SW) that out here on the west coast we > installed a contactor which was controlled via either AGS or manual remote > start. It shuts the AC off in a hard way yes, and you sure might get a light > flicker but you don’t get the voltage/Hz sag being a problem here. > > And I’m not sure but seems to me that some of the older generators used to > come with an internal contactor that did this? > But none that I’m seeing now do. > Maybe others can comment on that. > > And finally I’m curious about how important the cool down period is. > How I set my generator run times, by the time its told to shut down its not > running all that hard, which shouldn’t be a problem. > But again, I’ll defer to the genny experts here. > > Happy new year > > jay > > > > > > > >> On Dec 30, 2016, at 1:13 AM, Hugh Piggott <h...@scoraigwind.co.uk >> <mailto:h...@scoraigwind.co.uk>> wrote: >> >> hi Lou, >> >> I don’t wish to contradict this version of events but if true then it will >> make the inverter unsuitable for most generators. Here is another scenario >> I have seen a few times that looks similar but can be fixed. >> >> The inverter charges the battery etc. and decides to turn off the generator. >> It disconnects. It may or may not have its own “cool down” time for the >> generator. It then tells the generator to stop. At this point the >> generator control circuit may decide to run a further cool down period. >> Meantime incoming AC voltage is still visible to the inverter. The inverter >> may then decide that it is obliged to connect to this running generator. >> After any chosen “warm up period” it may go ahead and synch with the running >> generator and start to draw power just before and during the point where >> fuel is shut off and it dies. This causes power quality problems and errors >> in some inverters. Maybe better firmware could fix this. Victron inverters >> are designed to disconnect on a falling voltage every time, and they do so >> gracefully. With SMA inverters and Outbacks it’s better avoided. >> >> The best fix for this is to make sure that the generator does not have its >> own cool down period. If you can access and edit this parameter in the >> generator this is best. Another fix is to set a longer warmup time in the >> inverter software but this can cause issues where the generator is being >> started to meet a high load. In the case of an SMA inverter you can get a >> fix to it using “genman mode”. >> >> I just wonder if you have witnessed the process and checked whether the >> generator’s own built-in cool down period could be the cause. >> >> cheers >> Hugh >> >>> On 30 Dec 2016, at 00:43, Lou Russo <l...@spreesolarsystems.com >>> <mailto:l...@spreesolarsystems.com>> wrote: >>> >>> Thanks to all for the input and suggestions, it is much appreciated. Just >>> to be clear about the situation, the inverter has already made the AC >>> transfer, which goes smoothly. The AC IN light is off. At this point the >>> generator is unloaded and there is no battery charging happening. The >>> inverter is carrying the loads. From what Schnieder tells me is that the >>> software is telling the inverter to follow the Hertz of the generator until >>> it's below 40 Hertz. >>> >>> I do believe that manual start is best as it keeps the user in tune with >>> system. It is what I do at my own home. Unfortunately most clients want the >>> autostart and don't want to think about it. This is typically not deal >>> breaker for me and I will push a client only so far on it. In this >>> particular situation the system is 500 ft away from the home. So the >>> autostart is mandatory. >>> >>> >> >> _________ > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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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