I have AC-coupled an Outback quad-stack with multiple SunnyBoy 6000US inverters and it's been running fine for 4 years. I used the off-grid version of Outbacks.
Now I have an application where a customer wants to add battery backup to an existing SunnyBoy 5000US system. And expand his array by a couple KW. So I'm thinking of using a GT Outback w/ batteries to handle the critical loads and feed the extra 2kw of PV (charging the batteries through an MX60) to the grid. And I'd like to AC-couple the SunnyBoy so the original 5 kw array can also charge the batteries, BUT I remember, at least I think so, that the GT inverter cannot be AC-coupled, only the off-grid version. Is this correct? Thanks. Kirk Herander VT Solar, LLC dba Vermont Solar Engineering NABCEPTM Certified installer Charter Member NYSERDA-eligible Installer VT RE Incentive Program Partner 802.863.1202
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