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Hello Vince,</div>
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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.</div>
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<div class="elementToProof" role="presentation">Issues with 3<sup>rd</sup> party accessories such as extra diodes integrated onto the DC side of the inverter, optimizers, DC combiners</div>
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<div class="elementToProof" role="presentation">Unaccounted for Bi-facial module gains</div>
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<div class="elementToProof" role="presentation">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)</div>
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<div class="elementToProof" role="presentation">The battery is possibly being overdrawn (if it is being used look for issues involving the battery, or a shorted/ large AC load)</div>
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<div class="elementToProof" role="presentation">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</div>
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<div class="elementToProof" role="presentation">Hot conductors/ pinched conductors/ issues with conductor sizing/ double lugging</div>
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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.</div>
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Best Regards,<br>
<br>
Jharen Poole<br>
Applications Engineer II<br>
972-575-8875</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Vince McClellan via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Friday, April 10, 2026 6:04 PM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Vince McClellan <vince@solarenergydesign.com><br>
<b>Subject:</b> [RE-wrenches] Sol-Ark 15K2P F20 MPPT Overcurrent Error</font>
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<div>Hello Wrenches</div>
<div>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. </div>
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<div>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. </div>
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<div>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. </div>
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<div>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. </div>
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<div>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. </div>
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<div>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. </div>
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<div>I could use any suggestions that come to mind. I'm not sure what else to try at this point. </div>
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<div>Thank you, </div>
<div><br>
</div>
<div><br>
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