OVP faults

True Hybrid Energy System
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Mike Curran
Forum Emperor
Posts: 1659
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)
- 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 (2x7) Talesun 275W (DC array input to SB 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

OVP faults

Post by Mike Curran » Thu Jul 30, 2020 2:03 pm

My Skybox battery voltage went high today - got a bunch of OVP faults, and several other things happened even though status was "partial operation with faults":
- Skybox AC output went to 0 - my loads all shut off
- even though grid was connected, SB would not sell to grid
- as a result, PV got curtailed (trying to hold battery voltage down)
- battery voltage was still high 2-1/2 hours after the first OVP fault occurred
Screenshot_20200730-170216_Samsung Internet.jpg
I bypassed the inverter to get my loads up and running, cleared all the faults, disconnected the grid and the PV, and shut off the inverter, then restarted the inverter, reconnected PV, reconnected grid, reconnected loads to Skybox, and everything settled back to normal.

Not expecting any answers but wondering if anyone else has seen this happen? First time (I think) this has happened and there weren't any unusual grid events at the time...
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

User avatar
BoMagluyan
OutBack Product Management
Posts: 28
Joined: Mon Mar 19, 2018 12:29 pm
My RE system: SkyBox
12x EnergyCell PLR batteries in an IBR3
no PV

Re: OVP faults

Post by BoMagluyan » Thu Jul 30, 2020 4:19 pm

Can you refresh my memory please, which inverter, or micro-inverters, are AC Coupled to this SkyBox? Looks like the same thing may have happened yesterday as well, but SkyBox recovered from it (yesterday) without needing a human reboot.
Bo Magluyan
OutBack Product Management

OutBack Power Technologies, Inc.
An Enersys Company
1628 W Williams Drive, Phoenix AZ 85027 USA
www.outbackpower.com

Mike Curran
Forum Emperor
Posts: 1659
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)
- 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 (2x7) Talesun 275W (DC array input to SB 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: OVP faults

Post by Mike Curran » Thu Jul 30, 2020 5:08 pm

Bo - I've disconnected the AC array from the Skybox output. It is now direct grid tied, independent of Skybox.

Because of Skybox's 5kW sell limit with the Enphase M215 microinverters, I was seeing my DC PV array output getting curtailed and wasn't realizing its full 3850 watt output potential, reducing my sell to grid. So now the only PV connected to Skybox is the DC array, no AC coupling. Been that way for about a month or so.

- Mike
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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