[RE-wrenches] Magnum Frequency Shift

[Jay]

Hi Mark,

Then the relay method is easy and reliable to use. 

Relay trips at whatever battery voltage you don’t want to exceed. 

I use a solid state relay with a good heat sink, only switching one leg. 

Jay






> On Jun 13, 2020, at 7:05 AM, Mark Frye <markf at berkeleysolar.com> wrote:
> 
> 
> On.
> 
>> On 6/12/2020 7:27 PM, Jay wrote:
>> Hi Mark
>> 
>> Is this off grid or on?
>> 
>> Jay
>> 
>>> On Jun 12, 2020, at 7:09 PM, Mark Frye <markf at berkeleysolar.com> wrote:
>>> 
>>> 
>>> I see. 
>>> 
>>> What you say about the frequency shift being slow makes me again doubt the value of even using it in my application.
>>> 
>>> I have a controller that can regulate the AC dump load. That same controller has a high limit switch which I could use to cut the AC feed to the GT inverters. But then both functions are in the same device. On the other hand, it is a very reliable device so....perhaps sufficient.
>>> 
>>> On 6/12/2020 6:37 PM, Bradley Bassett wrote:
>>>> I have a relay on the XW+ Aux and also frequency shift which is usually slower, so the relay usually cuts out first. I also have a DC coupled array feeding the system. 
>>>> 
>>>> Brad
>>>> 
>>>> On Fri, Jun 12, 2020 at 4:34 PM Mark Frye <markf at berkeleysolar.com> wrote:
>>>>> Yes an elite group within an elite group.
>>>>> 
>>>>> So the SB240 does not have frequency shift /wattage control. How are you implementing charge control in stand alone mode?
>>>>> 
>>>>>> On 6/12/2020 4:28 PM, Bradley Bassett wrote:
>>>>>> Wow! Someone else with SMA SB240's, I have 12 of them that I've AC coupled to an XW+5548. They are very solid performers. 
>>>>>> 
>>>>>> Brad
>>>>>> AEE Solar
>>>>>> 
>>>>>> On Fri, Jun 12, 2020 at 3:39 PM Mark Frye <markf at berkeleysolar.com> wrote:
>>>>>>> Hello,
>>>>>>> 
>>>>>>> I have a small array of 8 - SMA SB240 microinverters on the roof. Peak 
>>>>>>> power out of the array has never exceeded 1800 W.
>>>>>>> 
>>>>>>> I am adding a Magnum MS-PAE 4448 with a 315 AH flooded Lead Calcium 
>>>>>>> battery bank.
>>>>>>> 
>>>>>>> Cheers
>>>>>>> 
>>>>>>> On 6/12/2020 12:31 PM, Chris Schaefer wrote:
>>>>>>> > G'Day Mark,
>>>>>>> >
>>>>>>> > Which grid tied inverter are you attempting to AC couple with. I 
>>>>>>> > apologize if you already called it out in the thread.
>>>>>>> >
>>>>>>> > Christopher
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