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

[david quattro]

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
Good luck and please let us how this one resolves.



On Fri, Apr 10, 2026 at 4:05 PM Vince McClellan via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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
>
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