[RE-wrenches] "DC current Injection": Whazzat?

[bob at midnitesolar.com]

Maybe the blender in question uses some kind of half wave rectification 
to control speed or something like that ?

boB


On 8/17/2017 8:43 AM, RE Ellison wrote:
> If getting rid of the blender which is the easier choice or at least 
> trying a different blender to see if that does it is out of the question
>
> How about the possibility of changing the solar edge to the magnum 
> version of the panel inverter that they use to see if there are more 
> compatible?
>
> Possibly disconnect all and try just 1 new panel mount
> to test ?
>
> Just a thought,
> Bob ellison
>
> On Aug 17, 2017, at 9:51 AM, Mick Abraham <mick at abrahamsolar.com 
> <mailto:mick at abrahamsolar.com>> wrote:
>
>> Hi, Wrenchies~
>>
>> My client has an AC coupled battery based setup. The batteries are 
>> good ol' lead floodies in pretty good health, the battery based 
>> inverter is Magnum MS4448PAE, & the string inverter is SolarEdge. 
>> There's also a Magnum ACLD "AC Load Diversion" control to regulate 
>> battery state of charge when there's no grid power.
>>
>> When there's no grid power & the system is on it's own, the SE 
>> inverter sometimes throws an error code 36 "DC current injection". 
>> This happens when the mongo blender is operated (Vitamix brand, older 
>> model) & again in a >no public power grid< situation. The error 
>> causes the synchronizing string inverter to de-couple from the Magnum 
>> then the standard five minute time-out ensues before a re-couple.
>>
>> I think DC current injection is when the transformer-less SE inverter 
>> pumps a blip of DC into the grid--or micro-grid when there's no grid 
>> power--and I guess DC injection is IEEE verboten because it 
>> compromises power quality/power purity. Can the experts confirm if 
>> this is correct understanding, explain how DC can show up on the AC, 
>> and offer suggestions other than a replacement blender?
>>
>> Thanks as always. The Wrench List is the Bomb!
>>
>> Mick Abraham, Proprietor
>> www.abrahamsolar.com <http://www.abrahamsolar.com>
>>
>> Landline: 970-731-4675
>> Cell phone or for text messaging: 970-946-6584
>> ᐧ
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