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

Mon Apr 13 07:53:49 PDT 2026

I have found that Outback equipment would often give incorrect but related
error codes. For example: A high AC draw would cause the battery voltage to
drop. A low DC voltage would be reported, not the primary cause of high AC
current. I think it has to do with how often the sampling happens.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com

On Sun, Apr 12, 2026 at 10:32 AM Tyrone Houck via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> It's worth keeping in mind this same error can also be on the battery side
> of the DC bus and can be caused by AC loads and current settings...
>
> Tyrone Houck
> Oregon Solarworks LLC
> CCB #204937 LRT #076
> 541-787-1366
> tyrone at oregonsolarworks.com
>
>
>
> On Sun, Apr 12, 2026, 10:15 AM Lou Russo via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Vince and Wrenches,
>>
>> We also recently encountered this F20 error on a relatively new off-grid
>> system and are still working through it. The system will go weeks without
>> doing it, then do it twice in a day.
>>
>> The system consists of:
>> 1 Sol-Ark 15kW
>> 30kWh Discover Rackmount with Lynk2
>> 28 REC430AA Pure 2 modules
>> 28 AP Smart RSD-S-PLC
>> 1 TRANSMITTER-PLC with 2 cores
>>
>> Firmware:
>> Sol-Ark MCU 7.2.2.8 Comms 1.4.5
>> Rackmount - 4.11.1
>> Lynk2 - 2.6.0
>>
>> Smartload is utilized and it is charging an EV at 22A. The F20 occurs
>> whether the Smartload is activated or not.
>>
>> Similar to you, Sol-Ark blamed the AP Smart RSDs hence the dual cores and
>> odd (almost impossible) current spikes up to 22.7A logged on the
>> Solarkcloud.
>>
>> We will keep you posted if we find a solution but all signs point to a
>> inverter replacement. Too odd and too intermittent to be anything else in
>> my opinion.
>>
>> Lou Russo
>> Owner
>> lou at spreesolarsystems.com
>> Office - 808 345 6762
>> Direct Line - 808 731 1907
>> Spree Solar Systems LLC
>> CT-34322
>>
>>
>>
>> On Sun, Apr 12, 2026 at 2:36 AM Jay via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Is this a common problem with Sol Ark inverters?
>>>
>>>
>>>
>>> On Apr 12, 2026, at 5:40 AM, david quattro via RE-wrenches <
>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>> 
>>> In a similar vein of thought, it may be helpful to only engage one
>>> string at a time to hopefully isolate error codes.
>>>
>>>
>>>
>>> On Sat, Apr 11, 2026 at 8:36 AM Jason Szumlanski <
>>> jason at floridasolardesigngroup.com> wrote:
>>>
>>>> You might consider taking this one step further and physically
>>>> disconnecting one string at a time. Since the error happens multiple times
>>>> a day, maybe you can isolate the issue to one string.
>>>>
>>>>
>>>> Jason Szumlanski
>>>> Principal Solar Designer | Florida Solar Design Group
>>>> NABCEP Certified Solar Professional (PVIP)
>>>> Florida State Certified Solar Contractor CVC56956
>>>> Florida Certified Electrical Contractor EC13013208
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, Apr 10, 2026 at 7:56 PM david quattro via RE-wrenches <
>>>> re-wrenches at lists.re-wrenches.org> 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
>>>>>> <https://www.google.com/maps/search/860%0D%0AConger+St.+Suite+12,.+Eugene,+OR+97402?entry=gmail&source=g>
>>>>>>
>>>>>> e: vince at solarenergydesgin.com
>>>>>>
>>>>>> w: SolarEnergyDesign.com
>>>>>>
>>>>>> CCB# 161672
>>>>>>
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