Well Pump Causing PCS-NPC OVP2 Fault

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Photon Kapture
Forum Member
Posts: 13
Joined: Tue Jan 14, 2020 4:54 pm
My RE system: 3.9 Kilowatt (13) Solar World sw300 Array.
Outback Skybox
(3) Simpliphi Lithium Iron Phosphate Batteries (2) 3.5 and (1) 3.8KWH
Location: Schroeder, Minnesota

Well Pump Causing PCS-NPC OVP2 Fault

Post by Photon Kapture » Thu Jun 04, 2020 4:33 pm

Hi All,

I could use some help. I'm using Skybox in an off grid situation. My Grundfos 3/4hp soft start well pump is causing skybox to fault every time the pump kicks on. This causes the critical loads panel to lose power momentarily (whole house loses power) while skybox eventually clears the fault on its own and the pump cycles as normal. When I run a generator through Skybox to the critical loads there is no fault when the pump cycles and everything works as it should. The voltage on the generator reads between 242 and 247 while the pump is on. Also the loads tile reads 1.2 to 1.6 KW while the pump cycles and it ramps up slowly as it's soft start. Not sure if that is relevant info.

What am I missing? How can I fix it?

Thanks all, any thoughts are appreciated.
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Screen Shot 2020-06-04 at 6.26.54 PM.png

Mike Curran
Forum Emperor
Posts: 1817
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 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: Well Pump Causing PCS-NPC OVP2 Fault

Post by Mike Curran » Fri Jun 05, 2020 6:19 am

I had a similar issue with OVP faults during a grid outage/instability event. OB Tech Support gave me this info. Not sure it applies to your case but worth a look:
Looks like your DAB OVP (basically the module in control of the battery) are being caused by an end amp setting that's too low. Your logs indicate that the grid frequency and voltage went out of range a few times over the last day, this caused the SkyBox to disconnect. In this case, the PV that was being produced is sent to the battery as a buffer while the SkyBox curtails PV production to meet the load demand. Since your batteries were probably really full before this occurred, when the unit went off-grid it caused an over voltage fault.
The end amps setting probably isn't your issue but the voltage instability could be. Caused by the soft start :?:

PS I may be wrong but I didn't think a warning would trip your SB off. Are there any other issues in your event log?

Also, the event log at your SkyBox local display gives more info than Optics does but it's somewhat cryptic, and OB doesn't have a "translator app" up and running yet - but I understand one is coming soon...if you call them someone can interpret the error code for you.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

Photon Kapture
Forum Member
Posts: 13
Joined: Tue Jan 14, 2020 4:54 pm
My RE system: 3.9 Kilowatt (13) Solar World sw300 Array.
Outback Skybox
(3) Simpliphi Lithium Iron Phosphate Batteries (2) 3.5 and (1) 3.8KWH
Location: Schroeder, Minnesota

Re: Well Pump Causing PCS-NPC OVP2 Fault

Post by Photon Kapture » Fri Jun 05, 2020 7:13 pm

Thanks Mike,

I'll have to put a volt meter on my loads panel and see what that reads when the pump starts and ramps up.
Thats interesting (your battery over voltage issue) even if it doesn't exactly apply to my problem it helps me understand how skybox diverts solar momentarily to your battery if it can't send it too a load or back to the grid.
Mike Curran wrote:
Fri Jun 05, 2020 6:19 am
PS I may be wrong but I didn't think a warning would trip your SB off. Are there any other issues in your event log?

Yes maybe its not the fault warning only that causing skybox to drop the loads momentarily but i think it is. I'll check to see if there is another fault and get the official translation...

Im just really hoping that I'll be able to use my well on the critical loads. Even in an on grid scenario water would be very important in a grid outage. :shock:

Mike Curran
Forum Emperor
Posts: 1817
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 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: Well Pump Causing PCS-NPC OVP2 Fault

Post by Mike Curran » Fri Jun 05, 2020 7:34 pm

You can see the detailed error codes on this screen, which can be accessed either from your local Skybox display or on the SkyBox web inrterface:
Screenshot_20200605-222546_Samsung Internet.jpg
Either method starts with clicking on the Skybox icon, then twice on the down arrow. When there's a fault you'll see an error code in the field where the fault occurred. You'll need to log in with installer access to get there.

BTW, great handle =D>
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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