[RE-wrenches] Magnum Frequency Shift

[Jay]

Hi Mark,  

Agreed that diversion is the way to go. 
As 4v above absorb volts is completely unworkable. 

 But I’m not sure that I agree about .5 hz will do anything. The new rule 21 inverters go off line at 64 hz. And there is a type of tapering based on hz shift, but it won’t shut off a new gt inverter at+ .5hz. 

Cheers

Jay



> On Jun 12, 2020, at 10:08 AM, Mark Frye <markf at berkeleysolar.com> wrote:
> 
> 
> Thanks Jay,
> 
> I talked again with Magnum.
> 
> I have the latest Rev 6.1 MS-PAE 4448 so the exact implementation has changed from that described in AN002, 5/10. The current Rev. has changes designed to improve interaction with the GT inverters. I didn't really get to the bottom of that. But the critical aspect of this remains unchanged:
> 
> - the Magnum will have shifted the frequency <down now> by 0.5 Hz <sufficient to knock the GT inverters off-line> when the DC voltage rises to Absorb + 4V.
> 
> This makes more sense than the 6V I had in my notes (which may have meant 6V above Float.)
> 
> With all this in mind, I think I will plan on using this feature as a backup to an AC dump load controller set to maintain Float voltage.
> 
> 
> 
>> On 6/12/2020 7:12 AM, Jay wrote:
>> Hi Mark
>> 
>> I found this which might be of help. 
>> 
>> https://www.magnum-dimensions.com/sites/default/files/MagArchive/AN-0002-AC-Coupling-Rev-5-10.pdf
>> 
>> Jay
>> Peltz power. 
>> 
>>> On Jun 12, 2020, at 6:59 AM, Mark Frye <markf at berkeleysolar.com> wrote:
>>> 
>>> Looking for confirmation from Wrenches who know Magnum inverters:
>>> 
>>> - MS-PAE
>>> 
>>> -ME-RC
>>> 
>>> - Frequency shift enabled (battery type "Custom")
>>> 
>>> - AC coupled PV inverters w/o frequency shift capability
>>> 
>>> Function:
>>> 
>>> At Absorb voltage frequency shift is zero, at Absorb voltage + 6 V, shift is 0.5 Hz <grid ties pushed off-line> (in 0.3 volt increments)
>>> 
>>> This is from my notes from a tech support call, but I am wondering if I have it mixed up. Protecting at 6 volts above the Absorb seems a bit high.
>>> 
>>> Thanks,
>>> 
>>> Mark
>>> 
>>> 
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