[RE-wrenches] Further Followup Radian 8048 incorrect high voltage reading

[Jay]

I don’t know if you can get any help from OB. 
Have you tried Zonna?  
And yes the boards have been a weak link in that design. 

Is this a 8048 or a 8048A?

> On May 7, 2025, at 10:46 AM, Drake Chamberlin via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> 
> The issue was the Radian 8048 disconnected from the grid on an incorrect high voltage reading. Remaking the connection to the ribbon cables seemed to solve the problem...temporarily. 
> 
> After about a week, the problem came back. This time I treated the all the contacts with the antioxidant that comes in the small tubes. All seemed well for a while, then the problem returned, and is no longer intermittent. 
> 
> Wiggling the cable connections made no difference.
> 
> I took a close up photo of the control module as suggested, and can see no broken solder joints.
> 
> <4b443fa4.png>
> 
> I tried turning off the power modules, one at a time, but no difference. I have checked all the settings, then did a factory reset on the unit. I had an extra ribbon cable, so was able to swap cables around. The problem did not change.
> 
> Does this seem like a defective control module with no solution other than replacing it?
> 
> Thanks,
> 
> Drake
> 
> 
> 
> Drake Chamberlin
> 
> Athens Electric LLC
> 
> Ohio Electrical Contractor’s License 44810
> 
> NABCEP Certified PV Installation Professional
> 
> ---
>  
> 
> 
>> On 2025-04-09 13:04, drake.chamberlin at redwoodalliance.org wrote:
>> 
>> For a followup, it appears that the problem was in a ribbon cable connection. After checking the power wiring and starting the inverter again, the problem still remained.
>> 
>> Then, I disconnected and reconnected the ribbon cables at both ends. On restart, the voltage was with 6 V of the multi meter reading. I adjusted this out with the offset in the calibration menu. The voltage has read steady for a day now.
>> 
>> Thank you!
>> 
>> Drake
>> 
>> Drake Chamberlin
>> Athens Electric LLC
>> OH Electrical Contractor License 44810
>> NABCEP Certified Solar PV Installation Professional
>> 740-856-9648
>> 
>> 
>> ---
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