[RE-wrenches] Sol-Ark 15K2P F20 MPPT Overcurrent Error

[Poole, Jharen]

Hello Vince,

Normally, this fault is triggered from too much current on the MPPT(s) of the inverter. If this is not the case, then there can be other possibilities. I'll list some of the other possibilities below.


  *
Issues with 3rd party accessories such as extra diodes integrated onto the DC side of the inverter, optimizers, DC combiners
  *
Unaccounted for Bi-facial module gains
  *
A possible ARC fault is actually occurring (you can enable ARC fault detection on the inverter to see if an ARC fault triggers in place of the F20 Fault)
  *
The battery is possibly being overdrawn (if it is being used look for issues involving the battery, or a shorted/ large AC load)
  *
In rare cases, you can see this fault when the grid is down and the battery is bad which causes it to be unable to support loads
  *
Hot conductors/ pinched conductors/ issues with conductor sizing/ double lugging

I personally do not have background on your case with our support team, but if this fault is still giving you trouble after checking the various recommendations on this thread, please feel free to message me directly and I can speak to a support supervisor to see if your case needs to be escalated.

Best Regards,

Jharen Poole
Applications Engineer II
972-575-8875
[cid:9fba026e-7022-45d3-bb35-a1bea4434d1c]
________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Vince McClellan via RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Friday, April 10, 2026 6:04 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: Vince McClellan <vince at solarenergydesign.com>
Subject: [RE-wrenches] Sol-Ark 15K2P F20 MPPT Overcurrent Error

Caution: This email is from an external source.


Hello Wrenches
Has anyone else on this list had issues with a Sol-Ark 15K2P randomly shutting down several times a day with an F-20 MPPT overcurrent error? The errors are occurring when the system is well under the max amperage per MPPT of 26 amps. We've had the inverter turn itself off when the online data shows 12.5 amps max. I realize that Sol-Ark's online data updates only every 5 minutes, so I could be possible that there is a spike that the online data isn't showing, but the array is in full sun with the same number of modules and the same string configuration on all 3 MPPT's.

We are also seeing other anomalies such as MPPT 1 at 12 amps with MPPT 2 and 3 at 22 amps. Again, with the solar array in full sun, no clouds, and no shade.

Sol-Ark originally thought it was because of an issue with Tigo RSD switches, but we don't use Tigo. We've had way too many issues with Tigo products.

We've had people suggest that we're seeing the results of an edge of cloud affect, but there are not clouds to cause this.

We've also tested all the circuits with a insulation tester in every possible configuration, and tested our wiring to insure there were no mistakes by ringing it out with a multimeter. The wiring is good.

Sol-Ark tech support doesn't seem to know what the issue is, but they are assuring us that it's not their inverter at fault.

I could use any suggestions that come to mind. I'm not sure what else to try at this point.

Thank you,



Vince McClellan

President

NABCEP PV Professional

p: 541-485-8122

a: 860 Conger St. Suite 12,. Eugene, OR 97402

e: vince at solarenergydesgin.com<mailto:vince at solarenergydesgin.com>

w: SolarEnergyDesign.com

CCB# 161672

[https://ci3.googleusercontent.com/mail-sig/AIorK4wC-ZXfQzkibWZNI9aP7aFzUpqgwCEyY-FpsqQY_76qgx9AUxOA5kFpfiX_Jceh2N-O7yCP_sjrlXee]

If you have received this email and are not the intended recipient, please delete this email. Copying or using any part, content, or attachment of this email is strictly prohibited.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20260414/71a45016/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Outlook-3jdftdut.png
Type: image/png
Size: 82002 bytes
Desc: Outlook-3jdftdut.png
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20260414/71a45016/attachment.png>