Matt,
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. 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. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail offgridso...@sti.net [2] text 209 813 0060 On Tue, 22 Oct 2019 12:07:45 -0400, Matt Sherald wrote: Hi All, 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. 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. 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. -- Matt Sherald PIMBY Energy, LLC NABCEP Certified Solar PV Installer(R) 304-704-5943 www.getpimby.blogspot.com [3] www.getpimby.com [4] -- Links: ------ [1] http://members.sti.net/offgridsolar/ [2] mailto:offgridso...@sti.net [3] http://www.getpimby.blogspot.com [4] http://www.getpimby.com
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