I did AC couple a Magnum inverter to an existing Sunpower
system. It works. The Magnum features frequency shift control, but
recommends the use of a protective relay also.
At 04:59 PM 7/30/2013, you wrote:
Hi All;
I know AC coupled systems have been covered before, but I have a new
issue: positive grounding. A customer with an existing 8kw
Sunpower system wants to add backup. He was put off by the high
cost the Sunny Island, so I was steering him towards a single
Outback VFX coupled to just one of his 3 inverters. The issue is
how will the VFX work with positive grounded inverters. I'm
assuming that since the two inverters will only be connected by AC,
that the positive vs negative grounding of their separate DC systems
will not matter. Any experience with this particular scenario:
Sunpower system AC coupled to an Outback?
Also, would I even need a GVFX, since the inverter would only be
used during outages (which might allow a generator to be used later
as well) A VFX should still AC couple to the GT inverter during an
outage, right?
Thanks as always,
--
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
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