Inverter noise [RE-wrenches]

[Michael Welch]

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Hello gang. I have a question that I hope you all will benefit from seeing answered.

A group I work with, Redwood Alliance, recently finished installing the first half of our demonstration system feeding the utility meter for the upper floor of our office building. We installed an intertied OutBack system with a battery backup, using 24 Shell SP130s. 
www.redwoodalliance.org/redwood_outback.jpg
www.redwoodalliance.org/redwoodalliance_shellsolar.jpg

Since this is a demonstration project, we decided to put the equipment inside our office. We found that the fan noise in the OutBack equipment is not horribly disturbing, but if anyone wants a quiet space this is probably not the way to go. The inverter fan must be larger and, therefore, more noisy than the MX fan.

A crew is about to start work on the second half of the system, which will have the same number of modules on the roof feeding a Fronius inverter and a second utility meter, for the lower floor of the building. Originally, we intended to have the Fronius downstairs in the utility room. But, I was thinking it would be neat to also have it in our office. 

My question is, how noisy is it? Quieter, noisier, or the same as the OutBack? Any other info to impart?
  
Michael Welch
  
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"Whenever you find yourself on the side of the majority, it's time to pause and reflect." 
                                    Mark Twain
        
Michael Welch, michael.welch at homepower.com
     Home Power magazine
     www.homepower.com
     To reach me: 707-822-7884
     To reach Home Power: 800-707-6585

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