Neutral Bonding

Discussion about OutBack Inverters in Grid Tie Applications

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Smith3970
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Posts: 1
Joined: Thu Mar 28, 2024 5:58 pm
My RE system: PS2 with 2 Outback VFX3648A Inverters, 2X4 strings of Kilovault 3600 Wh Lithium Batteries, 3 Flexmax 80 MPPT Outback Solar Charge Controllers, 7280 Watts of panels on 3 Manual Trackers, The Grid, that is a story of its own. The inverters are in Grid Zero for now, as i have yet to apply for a Grid Tie agreement

Neutral Bonding

Post by Smith3970 »

Hi All, I'm new to the forums and have several questions, I'll ask each one separate over time to stay focused. My system of two 48V Outback inverters has always had the neutral bonded to earth in the PS2 enclosure, that has always been the only neutral earth bond. The house main and various other panels are unbonded to the neutral. We connected to the Grid last November and had an electrician wire in the 400 amp service entrance on a stand alone pedestal close to the power company transformer. I noticed he bonded the neutral to ground in the service and when I questioned that, he maintained that the only neutral ground bond had to be at the first panel. He recommended that if I had any other neutral/earth bonds I should remove them.
So this is where I'm at now, two bonds which flies in the face of Outback Powers guide lines. If I go with the electricians plan and the grid goes down like it did for several days this winter, my equipment grounds have no access to a neutral to blow a breaker in a timely manner. If I leave both, Outback may not honor warranties.
I found several posts that almost fit my question but not a final opinion
raysun
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My RE system: Flexpower Two: (2) FXR3048A-01 - Series Stacked, (2) FM80, MATE3s, FlexNetDC
6 SimpliPhi 3.8-48 (48v @ 75AH. 450AH total)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
2 Midnite Solar MNPV6 combiners w/20A DC disconnects.
Honda EU7000is gas fuel generator
Off-Grid

Re: Neutral Bonding

Post by raysun »

The general guidance is for the N-G bond to be at the source of AC. Logically, this is best at the service entrance, so the pedestal would meet the guidance (and perhaps, code.)
If the grid goes down, why would the N-G bond be impacted?
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