[RE-wrenches] AC Coupling different brands

[Drake]

It seems a little vague on that point. Talking to Fronius tech 
support did not produce a definitive answer. I think so long as the 
system is basically grid tied, it likely wouldn't. In the webinar, 
the presenter said that Fronius wasn't worried about the AC relay 
being switched on and off by the process of AC coupling. I wouldn't 
design an off grid system around a Fronius.

At 06:49 PM 5/27/2013, you wrote:
>Maybe their position has changed, but the last time I looked into AC 
>coupling a Fronius inverter I was told by Fronius that it would void 
>their warranty. Has that policy changed?
>
>Regards,
>
>Gary Willett
>Icarus Engineering LLC
>
>On 5/27/13 3:48 PM, Drake wrote:
>>I also saw that webinar. We had just coupled a Fronius 10K to a 
>>pair of Sunny Islands.  It seems to be working fine. It is a backup 
>>system, so we have only tested it.  SMA tech support assured me it 
>>would work before we bought the system.
>>
>>Is the Outback wave form unique in any way, causing the Magnum have 
>>issues? Is the Sunny Island wave form cleaner?
>>
>>  At 04:01 PM 5/26/2013, you wrote:
>>>Hi Jeremy,
>>>
>>>FYI:  I heard that Fronius is the most sensitive of the GT 
>>>inverters and so the most difficult to "fool" or keep on in an AC 
>>>coupled system.  That was from the Magnum AC Coupling webinar.
>>>
>>>Blessings,
>>>Kelly
>>>
>>>Kelly Larson
>>>Electrical Engineer
>>>NABCEP Certified Solar PV Installation Professional
>>>ISPQ Master Trainer
>>>CA Electrical Contractor# 868189
>>>
>>>
>>>On May 25, 2013, at 6:52 AM, All Solar wrote:
>>>
>>>>Hope everyone is enjoying their weekend!
>>>>I have a system where we have Installed a pair of XW inverters 
>>>>along with a 10k Fronius inverter.
>>>>We have been told that we need to limit the PV watts to the 
>>>>lowest XW inverter. We have XW capacity in excess of the array, 
>>>>so why can't they entire array feed the system when the grid is down?
>>>>Of course tech support is tougher when you use different brand 
>>>>names, but I'm sure this has been done in the field already.
>>>>Please contact me off list If you can help us out. The customers 
>>>>electrician on this job has been trying hard to figure it out, 
>>>>but I think he might be in too deep!
>>>>
>>>>Jeremy Rodriguez
>>>>All Solar
>>>>CO. USA
>>>>
>>>>
>>>>Sent by Jeremy's iPhone. Sorry for typos and shorthand!
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