Single phase inverter on a three phase system

Discussion about OutBack Inverters in Grid Tie Applications

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stuart
Forum Member
Posts: 6
Joined: Fri Nov 27, 2020 2:42 am
My RE system: Outback VFX3024E with mate single phase, EPEVER MPPT solar charge controller, 8 225ah deep cycle gel batteries. Three phase house system.

Single phase inverter on a three phase system

Post by stuart »

I have your VFX3024E single phase inverter but my house is in a three phase system, please can you tell me how to go about connecting it to one of the phases whereby I can have it setup on the HBX setting. The problem I've found is conflicting Neutrals that trip out the RCD.
Also if I link the neutrals on the inverter together so that there is just a live coming from the grid side and a small cable from the neutral in to neutral out on the inverter , then a regular cable from the inverters neutral out back to the single phase I want to run on the inverter is this possible or could it damage the inverter?
Sorry if this isn't very clear.
Mike Curran
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Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 - replaced MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
[***2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007-2020)]
- 2 grid-tied VFXR3524A-01's series stacked, ***replaced GVFX's (2020)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied

Outback Skybox - Barn roof: (2019)
- 14 Talesun 275W in series (DC array input to SB inverter/charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input (manual switch during grid outage only) from 14 Talesun 275W,
Enphase M215 microinverters, normally direct grid tied

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Re: Single phase inverter on a three phase system

Post by Mike Curran »

On my Outback inverters the neutral "in" is common to the neutral "out" so adding a jumper between them won't change anything. It sounds like you need to completely isolate the other two phases from the single phase you want to supply from your inverter. Not knowing exactly how your house is wired in 3 phase, I don't think you can make this work while there's any connection between them.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
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