<div dir="auto"><div dir="auto"><div dir="auto"><div>Vince,</div><div dir="auto">The f20 overcurrent error can also be a product of a loose or undersized battery cable(or not using a Y buss on the battery terminals) or the inverter trying to pull more current under load than bms allows(check max discharge amps vs battery/bms ratings). Limit to home mode can also cause an issue under abrupt switching of large AC loads-the confounding "High voltage DC buss" limitation of AIO inverters. I have noticed this when an AIO is trying to support input side main panel loads.</div><div dir="auto">If none of those things inform the diagnosis it may need a firmware update.</div><div>Best of luck! </div></div><br><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 10, 2026, 7:08\u202fPM Vince McClellan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi David</div><div>I appreciate your help. I hadn't thought of swapping strings because the MPPT channel that is triggering the F20 error is always different. It could be worth a try anyway as it's easy to do. I do think we're down to swapping the inverter to see if that clears the issue. </div><div><br></div><div>Sol-Ark hasn't been much help on this one. </div><div><br></div><div>Have a great weekend, </div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><p style="margin:0in;background-image:initial;background-position:initial;background-repeat:initial;font-size:12pt;font-family:"Times New Roman",serif"><span style="font-size:11pt;font-family:Georgia,serif;color:rgb(80,0,80)">Vince
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<p style="margin:0in;background-image:initial;background-position:initial;background-repeat:initial;font-size:12pt;font-family:"Times New Roman",serif"><span style="font-size:11pt;font-family:Georgia,serif;color:rgb(80,0,80)">CCB#
161672</span><span style="font-family:Arial,sans-serif"></span></p></div><img width="200" height="88" src="https://ci3.googleusercontent.com/mail-sig/AIorK4wC-ZXfQzkibWZNI9aP7aFzUpqgwCEyY-FpsqQY_76qgx9AUxOA5kFpfiX_Jceh2N-O7yCP_sjrlXee"><br><div><p style="margin:0in;background-image:initial;background-position:initial;background-repeat:initial;font-size:12pt;font-family:"Times New Roman",serif"><span style="font-size:11pt;font-family:Arial,sans-serif;color:rgb(80,0,80)">If you have received this email
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any part, content, or attachment of this email is strictly prohibited.</span><span style="font-family:Arial,sans-serif"></span></p></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 10, 2026 at 4:54\u202fPM david quattro <<a href="mailto:david@quattrosolar.com" rel="noreferrer noreferrer noreferrer" target="_blank">david@quattrosolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">i would swap which strings go into the different MPPT's to see if each specific problem follows the DC string // or do they follow the MPPTs. Another option is kinda a lot of work but might be worth it - take a different inverter out there and "bench test" it with those strings unadulterated</div><div dir="ltr">Good luck and please let us how this one resolves.</div><div><br></div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 10, 2026 at 4:05\u202fPM Vince McClellan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer noreferrer noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><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><div><br></div><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><div><br></div><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><div><br></div><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><div><br></div><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><div><br></div><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><div><br></div><div>I could use any suggestions that come to mind. I'm not sure what else to try at this point. </div><div><br></div><div>Thank you, </div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><p style="margin:0in;background-image:initial;background-position:initial;background-repeat:initial;font-size:12pt;font-family:"Times New Roman",serif"><span style="font-size:11pt;font-family:Georgia,serif;color:rgb(80,0,80)">Vince
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