Folks, I am back on the project where I want to install grid tied inverters (Enphase) on a feeder located downstream of a generator and ATS.
I have considered using a drop out contactor to isolate the inverters from the generator following a loss of line voltage. As an alternative, how well might it work to reset the generator frequency so that it is outside the inverter range? In this way the inverter would always see the generator as "bad" energy and therefore would never connect to the generator, only the utility. The nominal frequency range for the inverter is 59.3 to 60.5. What is the effect on the loads in the household if the generator frequency is adjusted to say 58 or 62 hertz? Would the higher or lower number be better? Would this fry everything in the house? I can't see that making a relatively small change like this would effect the overall impedance such that a problem with current capacities would be a problem. It seems like the frequency would be more of a problem for some devices. Anyone have experience with deliberately adjusting generator frequency away from 60 hertz as described above? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 www.berkeleysolar.com
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