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

[drake.chamberlin at redwoodalliance.org]

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.

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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