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

[Mick Abraham]

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

Landline: 970-731-4675
Cell phone or for text messaging: 970-946-6584
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