I support Frank's idea, I measured the pf on my Hitachi washing machine and ended up adding a 10mF 330V run capacitor to the motor circuit. It was energised for both start run modes and solved an intermittent shutdown problem with one of my inverters. The same solution works for generators.
Rob Quoting Frank Leslie <[EMAIL PROTECTED]>: > > > > > Allow me to suggest a $30 purchase of a Kill-O-Watt meter. You can then > > measure the power factor of the washing machine, for example. Normally, a > > huge power system will tolerate 0.7 power factor (PF), but if you add a > > capactor inside at the motor terminals, you can change the power factor to > > near 1.0. Power guys don't normally think of resonance, but at 60 Hz, a > > resonant system looks resistive as all imaginary power swaps back and forth > > between the inductive motor and the capacitive capacitor. The source only > > supplies in-phase current. > > > > Loads vary between washing and spinning, so the highest current cycle should > > be compensated. There aren't many of these loads, but this compensation > > might help the invertor volt-amperes become all watts. > > > > Frank > > -----Original Message----- > > From: [email protected] [mailto:[EMAIL PROTECTED] > > Behalf Of [EMAIL PROTECTED] > > Sent: Saturday, December 03, 2005 9:55 AM > > To: [email protected] > > Subject: Re: [microhydro] petrol generator problem - low voltage > > > > > > Hello, > > > > I think like Frank > > There is a power factor problem > > > > I has this problem with fluorecents lamps. > > Most of petrols generator use bruschless alternator with capacitors and > > diodes to make the magnetic field. > > They are very sensible with bad power factors. > > > > When you connect capacitors, start the generator without charge. And > > connect after the xantrex with capacitor in the same time. > > (it help to create the magnetic field) > > > > regards, > > > > Eric > > > > > > ----Message d'origine---- > > >A: [email protected] > > >De: Graeme <[EMAIL PROTECTED]> > > >Date: Fri, 2 Dec 2005 15:38:02 +1100 (EST) > > >Sujet: [microhydro] petrol generator problem - low voltage > > > > > >I am setting up my micro hydro system. Until I get the generator > > installed at > > >the waterfall and the transmission line in place I am using petrol > > generators > > >to provide power to charge the batteries. > > > > > >The only load on the generator is a Xantrex Truecharge 40i+ > > > > > >So far I have had a Scorpian DY2500L replaced and the replecement > > repaired > > >because of low output voltage (ie less than 200v instead of 230v). I also > > have > > >two GMC 850W units that have the same problem. > > > > > >I have contacted Xantrex asking if the Truecharge puts a strange load on > > the > > >generator but they didn't answer the question. > > > > > >I can keep having petrol generators replaced / repaired while under > > warrenty > > >but I need to know the likely fault and how to prevent it. > > > > > >I do not want to have my hydro generator fail as it is not convienient to > > pull > > >out. > > > > > >If any-one has suggestions on likely cause and how to prevent it please > > let me > > >know. > > > > > >Cheers > > >Graeme > > > > > > > > > > > >____________________________________________________ > > >Do you Yahoo!? > > >Never miss an Instant Message - Yahoo! Messenger for SMS > > >http://au.mobile.yahoo.com/mweb/index.html > > > > > > > > > > > > > > > > > >Does your company feature in the microhydro business directory at > > http://microhydropower.net/directory ? 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