[RE-wrenches] Specific AC Coupling question

[Ray Walters]

Also worth looking at Magnum's new AC diversion load system.  It does 
the frequency shifting but also 4 kw dump load that can be set up to any 
AC electric load.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 4/4/2016 6:45 PM, jay wrote:
> HI Allan,
>
> The only reason to frequency shift is for “softer” charging.
> VRLA are not as sensitive to the pulse type charging that a relay type 
> charging would do.
> And regardless if you have frequency shift or not, you will still need 
> ( especially with VRLA) a high voltage relay.
> I recommend a SS relay, but a regular mechanical contactor will do as 
> well.
>
> jay
>
> Peltz Power.
>
>
>
>> On Apr 4, 2016, at 12:34 PM, Allan Sindelar <allan at sindelarsolar.com 
>> <mailto:allan at sindelarsolar.com>> wrote:
>>
>> Wrenches,
>> Core question first: Will a ~2010 Fronius IG-4000 respond properly to 
>> the frequency shift regulation supplied by a new Schneider XW+5548 or 
>> XW+6848?
>>
>> Situation: I haven't seen the Colorado site; I'm working as a 
>> consultant to produce an upgrade component list and will later serve 
>> as a resource during local installation of the upgrade equipment. 
>> Customer has hired me to turn a hodgepodge system into a GTBB system. 
>> The system has two key parts: an existing SW5548 with batteries, 
>> never properly installed (only AC1 in was ever connected to a main 
>> load center!) with 3.1 kW of tracker-mounted PV through an Outback 
>> FM60; and a roof-mounted 4kW array feeding the grid panel via the 
>> IG-4000. As currently installed, nothing will operate as wired during 
>> a grid outage, and a 240V AC well pump isn't supported.
>>
>> The simple plan is to replace the SW5548 with an XW+5548 or 6848 with 
>> Midnite E-Panel; replace batteries with Surrette FLAs; keep existing 
>> arrays unchanged; use existing FM60 for smaller tracked array; use 
>> existing Fronius IG-4000 but AC couple it to the output of the XW. 
>> The customer understands that sell amperage is limited by the 
>> inverter (to 20A @ 240V for the 5548, or 4,800W, or 27A @ 240V for 
>> the 6848, or 6,480W) when the grid is up, but the full array can 
>> charge the battery bank when the grid is down.
>>
>> Schneider tech support assures me that the XW+ is good in this 
>> application, but I need to get an OK from Fronius about 
>> frequency-shift compatibility. Fronius tech support tells me that it 
>> may or may not work: the 0.4 hz shift is within the the normal 
>> frequency tolerance for this model. While the tolerance window may be 
>> tightened up in the field, such tightening may cause nuisance 
>> tripping, especially with reactive loads like a well pump or A/C. The 
>> tech suggested that we first test the frequency-shift approach, and 
>> add a DC-coil contactor between the output of the Fronius and the XW+ 
>> if it doesn't.
>>
>> Has anyone AC coupled these two units? Did it work? Any unexpected 
>> problems? Did you add a voltage-controlled contactor? What should I 
>> advise my client?
>> Thank you,
>> Allan
>> --
>> *Allan Sindelar*
>> allan at sindelarsolar.com
>> NABCEP Certified PV Installation Professional
>> NABCEP Certified Technical Sales Professional
>> New Mexico EE98J Journeyman Electrician
>> Founder (Retired),Positive Energy, Inc.
>> *505 780-2738 cell*
>>
>> **
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