One Question: Output of the SunnyBoy is 240vac. So this is fed to the critical load panel, of which the SunnyIsland 120 vac output is fed to. So we need a 120/240 step up transformer between the SunnyIsland and the critical load panel to fully take advantage of the Sunnyboy array for battery charging, correct?.
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 From: [email protected] [mailto:[email protected]] On Behalf Of David Katz Sent: Friday, October 05, 2012 2:11 AM To: RE-wrenches Subject: Re: [RE-wrenches] AC coupling and Outback inverters Hi Kirk, All of the Outback inverters will work AC coupled (GT and FX) as will any bi-directional H-bridge type inverter. I have used old Trace SW's, SunnyIsland, Apollo TSW, Magnum AE and now I am using an Outback Radian to do exactly what you are talking about. I have 6 kW of grid tie inverter and an additional 4kw of modules running through a Xantrex 600 volt charge controller to the batteries that the Radian runs on. It all works flawless as long as you have a provision for protecting the batteries when the gid is down and the grid-tie PV system is making more power than the loads are using. If the customer has SMA inverters, I would recommend using a SunnyIsland because the battery control when the grid goes down is so elegant. Everything else is a bit of a kludge. David Katz CTO & Founder AEE Solar Inc P: 707 825-1200 F: 707 825-1202 [email protected] www.aeesolar.com From: [email protected] [mailto:[email protected]] On Behalf Of Kirk Herander Sent: Thursday, October 04, 2012 2:11 PM To: RE-wrenches Subject: [RE-wrenches] AC coupling and Outback inverters 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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