Before the UPS units were plugged in, it ran just fine. Once they were plugged in it sounded like it was struggling/running out of gas - this was resolved by closing the choke a little bit. Do you think that's a frequency problem?
110vac at the UPS. I didn't measure what was coming out of the generator. 6 amps per UPS load. It charges very slowly so maybe 7-8 amps. Still, well within the 20 amp circuit limit. Generator has a 220v 30 amp plug as well. It's an 8500w unit. This is it: https://www.lowes.com/pd/Troy-Bilt-6250-8500-Watt-Gasoline-Portable-Generator-with-Briggs-Stratton-Engine/4732729 UPS is two 1500va APC- Smart UPS 1500VA. It's an OLDER version of this: https://www.amazon.com/APC-Smart-UPS-SMX1500RM2U-1500VA-System/dp/B002TIR2Z2/ Josh Luthman 24/7 Help Desk: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mon, Sep 21, 2020 at 10:44 AM Ken Hohhof <af...@kwisp.com> wrote: > 110v at the generator or the other end of the 175 feet of 10 AWG wire? > > > > And total load is 5-6 amps each including the UPS charging the batteries? > What kind of UPS? Something like an APC will have a relatively low > charging current, other setups may be quite a bit higher. I know our Alpha > UPS units have programmable charging current and I had to lower it in case > the only generator I have available is our smallest Honda 1000 VA, > otherwise the generator would run for a minute or two and then trip on > overload. > > > > Doing the math on voltage drop in the wire, 10 AWG is around 1 ohm per > 1000 feet, and you have 350 feet of wire including hot and neutral. So > 0.35 ohm times 5.5 amps is 2 volts. Assuming the generator is putting out > 120 volts, that wouldn’t account for a 10 volt drop. > > > > Sounds like you suspect the generator can’t handle the load and as a > result is putting out low voltage. > > > > What kind of generator is this? Is it an inverter style? What is the VA > rating? If it’s just a standard generator for power tools and stuff, a UPS > will sometimes find the voltage or frequency out of spec or unstable and > refuse to run off it. If it’s just an APC UPS or something like that, > sometimes they have a sensitivity setting that you can set lower. > > > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Josh Luthman > *Sent:* Monday, September 21, 2020 9:22 AM > *To:* AFMUG <af@af.afmug.com> > *Subject:* [AFMUG] Generator power supply questions > > > > So Friday we have another 3 phase go down in the building. They unplugged > it all so that wing had nothing. > > > > As a precaution I start up the generator. When they're cutting the other > phases we are using I move it to the generator. The generator complains > and the UPS units don't switch over. I drop it to say 90% open choke and > the UPS switches over - but it's only 110v. I'd like to know what's going > on here. > > > > I have 175 feet of 10 gauge (times 2). Two circuits on the generator, two > runs of copper, two UPS. UPS is doing about 5-6 amps each. > > > What can I do better? Should I? It runs but I'd like to keep it as > simple as possible to avoid "teaching someone" to lower it from full open > choke. > > > > Josh Luthman > 24/7 Help Desk: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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