Is there an SMA rep on this forum that can give us more detail on the SunnyIsland/SunnyBoy AC coupled control loop? I thought that the frequency is altered by the SunnyIsland to trip a fault in the SunnyBoy, but the SunnyBoy is reporgrammed to override the 5 minute reset so that you had basic on/off control. If so, is this dymanic enought to provide PWM of the output of the SunnyBoy? Is the mechanism something other than above? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 <http://www.berkeleysolar.com/> www.berkeleysolar.com
_____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jeff Yago Sent: Tuesday, October 20, 2009 9:52 AM To: RE-wrenches Subject: Re: [RE-wrenches] AC Coupled Re-visited it is my understanding that the Sunny Island coupled with Sunny Boys is able to taper charge in an AC coupled system as the 2 inverters are able to communicate with each other and the Sunny Island alters the frequency input of the Sunny Boys and lowers the total output of the Sunny Boys to match the needs of the battery bank Kirpal Khalsa ---------------------------------------------------------------------------- --------------------------------------------------------------------- Yes, if we use a Sunny Island AC coupled with a SunnyBoy we would not have the battery charging problem, but remember, the SunnyBoy is 240 VAC and the Sunny Island is 120VAC which I also find is just has expensive to match up by having to install an external step-down transformer so I still feel inverter manufacturers are missing an opportunity to provide a needed product feature that nobody is providing. . Jeff Yago DTI Solar _____ Netscape. Just the Net You Need.
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