Grid-Tie Inverters with Batteries [RE-wrenches]

[Joel Davidson]

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Wrenches,



I've often said that if we did our grid-tied PV system now, we would use a batteryless inverter instead of our SW4048 with batteries because today's batteryless systems cost less and produce more energy. However, the new grid/battery inverters have me thinking about the value of grid-tie PV with battery backup.



One of PV’s big selling points is personal and national energy security, but if you have batteryless PV system and the grid goes down, so does your PV. According to “The Unruly Power Grid,” the cover story in the August 2004 issue of IEEE Spectrum magazine, the grid goes down a lot and really big power outages will continue to happen.



Just how often do power outages really happen? We have had only 3 grid outages since June 1998 totaling 45 hours. Two outages were energy crisis rolling blackouts and one was a neighborhood pole-mounted transformer that burned out. 

 

Those of you with batteryless PV, how many grid/PV outages have you had in how many years? What about your customers? Do you think the new grid-tie inverters with batteries are worth the extra system cost?



Joel Davidson

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