<p>Matt,</p>
<p>quite a few issues and the GT inv. idea is where I would go also. XW5548 can only sell 20A @240vac. I would just set up a manual A/B switch on the grid inverter solar input to be able to switch this to the mppt-80-600 for outages and bad solar days.</p>
<p>I can dig up the one I used. In this app we just added the second array for winter and let the mppt current limit when it was cold to avoid stressing it offgrid.</p>
<pre><strong><span>Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
<p>On Tue, 22 Oct 2019 12:07:45 -0400, Matt Sherald <matt@getpimby.com> wrote:</p>
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<div>I've been asked to review a GT-BBUS that was installed with a DC to AC ratio of 2.14. The system owner is frustrated b/c his 9.2-kW of PV is bottlenecked by an 80A MPPT (~4,300W). The inverter is a XW-5548 so there is a second bottleneck to overcome even if an additional CC were added.</div>
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<div>My inclination is to install a GT inverter for half the array and make a separate point of connection. I have considered adding a transfer switch on the PV conductors to allow the owner to toggle between this new GT inverter and the existing CC. I thought that having the option would be of benefit during extended outages with little sun.</div>
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<div>I'd be curious to know if anyone has had to solve a problem similar to this one and if they were able to find a suitable switch. To-date, I have not located a good transfer switch or breaker assembly with handle-tie etc... Any thoughts are greatly appreciated.</div>
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<div>Matt Sherald</div>
PIMBY Energy, LLC</div>
<div>NABCEP Certified Solar PV Installer®</div>
<div>304-704-5943<br /><br /></div>
<span><a href="http://www.getpimby.blogspot.com">www.getpimby.blogspot.com</a><br /></span><a href="http://www.getpimby.com">www.getpimby.com</a></div>
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