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

[Vince McClellan]

Hi David
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.

Sol-Ark hasn't been much help on this one.

Have a great weekend,


Vince McClellan

President

NABCEP PV Professional

p: 541-485-8122

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

e: vince at solarenergydesgin.com

w: SolarEnergyDesign.com

CCB# 161672

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On Fri, Apr 10, 2026 at 4:54 PM david quattro <david at quattrosolar.com>
wrote:

> 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
>>
>> w: SolarEnergyDesign.com
>>
>> CCB# 161672
>>
>> If you have received this email and are not the intended recipient,
>> please delete this email. Copying or using any part, content, or attachment
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