[RE-wrenches] Magnum Frequency Shift

[Mark Frye]

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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