[RE-wrenches] SunnyIsland - was AC coupling and Outback inverters
Kirk Herander
kirk at vtsolar.com
Fri Oct 5 05:41:00 PDT 2012
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: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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
dkatz at aeesolar.com
www.aeesolar.com
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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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